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The Atoll of Funafuti, Ellice group : its zoology, botany, ethnology and general structure based on collections made by Charles Hedley of the Australian Museum, Sydney, N.S.W.

Tribe Macrura

Tribe Macrura.

Ibacus antarcticus, Rumph.

Ibacus antarcticus (Rumph.), M. Edw., Hist. Nat. Crust., ii., p. 287.

One adult female purchased from the natives, who called it " Tappa Tappa."

Palinurus guttatus, Latr.

Palinurus guttatus (Latr.), M. Edw., Hist. Nat. Crust., ii., p. 297, pl. xxiii., fig. 1.

One adult male. Native name, " Oula."

This species lives in burrows on the sandy portions of the lagoon, and is much used by the natives as food.

Hippolyte gibberosus, M. Edw.

Hippolyte gibberosus (M. Edw.), Dana, Crust. U.S. Explor. Exped., i., p. 565, pl. xxxvi., fig. 4.

One female with ova, the dorsal spines on the carapace are furnished with hairs similar to those between the spines of the upper and lower margins of the rostrum.

Alpheus edwardsii, Audouin.

Alpheus edwardsii (Audouin), Dana, Crust. U.S. Explor. Exped., i., p. 542, pl. xxxiv., fig. 2.

Five specimens.

Alpheus lævis, Randall.

Alpheus lævis (Randall), Dana, Crust. U.S. Explor. Exped., i., p. 556, pl. xxx., fig. 8.

One specimen.

page 147
Betæus minutus, sp. no v.
(Plate vii., fig. 4, a, b.)

The carapace and abdomen is slightly compressed, smooth, and shining. Front with a short rostrum, which is broad at the base and acute at the apex. On each side of the base is situated a shallow sinus, bounded externally by a minute denticle.

The antero-lateral frontal margin is straight from the internal denticle to the outer angle, which is slightly produced. The inferior margin of the branchial walls forms a gentle curve from the front to the rounded posterior angle.

The peduncles of the first antennte are stout and a little longer than the peduncles of the second. The first joint is gibbous in the middle internally, it is longer than the second, and nearly twice as long as the last, the lanceolate basal scale slightly exceeds the extremity of the first joint. The flagella are ciliated and subequal, the inner with a short lobe bordered by six tufts of filaments. The peduncles of the second antennæ; as long as the scale, the latter is internally ciliate and externally armed with a short spine near the distal end, which however falls short of the foliate apex.

The last joint of the peduncle is very long and equal to the external margin of the scale, the joint bearing the antennal scale has a spine on its inner distal extremity. The chelæ; of the first pair of legs are equal. The ischium and merus are subtrigonal, the former slightly longer than the carpus, the latter as long as the carpus and the hand combined (fingers excluded). The carpus is obconical with the distal edge smooth and even. The palm of the hand is a little compressed, swollen in the middle and as long as the mobile finger. An ill-defined longitudinal line extends from the base of the immobile finger along the palm, fading away a short distance from the proximal end.

The fingers are sub-equal, a little curved, meeting along their edges when closed, and furnished with a few tufts of hairs at their extremities. The carpus of the second pair of legs is five-jointed, the first is the longest, the third and fifth are equal, whilst the fourth is the shortest.

The propodal joints of the fifth pair of legs more elongate than those of the third and fourth.

The dactyli are short and slightly curved at their extremities.

The telson is somewhat cunate, shorter than the uropoda, with two spines on each side close to the margin, and four at the truncated extremity, the inner pair of which are much the longest.

The inner ramus of the caudal appendages is much narrower than the outer, the latter with a broad scale-like spine at the base, and three at the outer distal extremity, the median one is page 148large, slightly curved and inserted close to the outer and smallest of the spines.

The inner branch of the pleopoda in the female has a short club-shaped process, situated on the margin in the middle or at a short distance below.

The legs are slightly hairy, when alive the specimens were of a reddish-sand colour, in spirit the posterior two-thirds of the carapace is scarlet, the abdominal segments are also tinted on the upper surface with the same colour.

About fifty specimens were obtained under stones and in sponges in the mangrove swamp.

Length of largest specimen from the tip of the rostrum to extremity of telson 14mm.
Length of external antennæ; 15mm.
Length of chelipedes 6mm.
Length of hand and fingers 2½mm.
Length of fifth leg 7½mm.
Harpilius miersi, De Mann,

Harpilius miersi, De Mann, Journ. Linn. Soc, Zool., xxii,, p. 274, pl. xvii., figs. 6-10.

Two females somewhat doubtfully referred to De Mann's species.

The specimens seem to differ slightly from the type as figured by the author.

The rostrum is five or rather seven toothed if the terminal and inferior teeth are included, they occupy the same relative positions to each other as those on the rostrum figured by De Mann. The small processes of the frontal margin between the insertion of the external antennæ; and the eye-stalks can scarcely be termed spinose, they consist of thin projections of the frontal margin of the carapace.

The colour of the specimens preserved in formol when received was a light cream with bluish spots, similar to Dana's figure of (Edipus superbus, the spots were uniformly distributed over the whole body and appendages.

Total length of largest specimen 25mm., rostrum and telson included.