CRUSTACEA. 281 



G. carinicauda is nearly allied to, and may prove to be identical 

 with, G. Mrtifrons, While, which Mr. Haswell (Cat. p. 1G4) men- 

 tions as commonly occurring in sponges at Port Jackson ; but in tho 

 latter species the spine of the lower margin of the hand (which exists 

 in adult examples of G. carinicauda) is absent. I may add that in 

 the type specimen of G. hirtifrons the bases of the second, as well as 

 of the third, pair of legs bear a spinule. 



2. Gebiopsis darwinii. (Plate XXXII. fig. A.) 



The carapace is vertically deep and laterally compressed (as in 

 Gebiopsis nitidus, A. M.-Edw.) ; its sides converge very slightly to 

 the front, which has four median spines on its anterior margin, ar- 

 ranged nearly iu a semicircle, and are equidistant, and behind this 

 the lateral margins are denticulated. The carapace is densely 

 pubescent above in front, and its dorsal surface is bordered anteriorly 

 by a suture, which is continued backward nearly as far as the cer- 

 vical suture, which is deep and well defined. The segments of the 

 postabdomen are nearly smooth, but clothed witli a few hairs ; the 

 terminal segment slightly transverse, with the posterior margin 

 straight and unarmed. The eyes, which have very short and thick 

 peduncles, are well nigh concealed beneath the front in a dorsal view. 

 The antcnnules are short, the peduncles scarcely reaching beyond 

 the front, and each bearing twosubequalflagella. The antennae are 

 little longer than the carapace ; the slender peduncles reach some- 

 what beyond the front ; the penultimate and terminal joints are 

 short, and clothed above with long hairs ; the flagella of the an- 

 tennas terminate in a pencil of hairs, and the several joints also boar 

 a few setae. The chelipedes are subequal and moderately robust ; 

 the merus-joints unarmed and somewhat hairy ; the hairs longest 

 and most abundant along the inferior margins ; the wrists are short, 

 thinly clothed with hair, and having a few minute spinules along 

 their upper margins, of which the anterior one is the most promi- 

 nent ; the palms longer than broad, somewhat turgid, rounded above 

 and below, and thinly clothed with hair, which is arranged iu dis- 

 tant longitudinal lines ; the fingers are hairy, much shorter than the 

 palms, thickened at base, dentated on their inner margins, with their 

 apices slightly crossed when closed, the upper much curved. The 

 second legs have the under margins of the merus-joints densely 

 fringed with hair, and the last three joints are also hairy ; the 

 penultimate joint louger than tho preceding, moderately dilated and 

 compressed ; dactyli shorter than the preceding joint ; the third legs 

 are similar to the second, but the mcrus is less hairy below, and the 

 propus is shorter ; the fourth and fifth legs are much shorter and 

 slenderer than the foregoing, and the last three joints are more or 

 less hairy, the hairs thickest along the inferior margins of the pro- 

 pus. The rami of the uropoda are broad, with the distal margins 

 straight ; they about reach to the distal end of the terminal seg- 

 ment of the postabdomen. Colour (in spirit) yellowish white. The 

 length of the largest specimen does not exceed 9 lines (19 millim.). 



