84 Mr. P. W. Bassett-Smith on 



This species is remarkably characteristic in form by its 

 rounded carapace, squarely cut genital segment, bearing at 

 the angle the fifth pera^opods, and elongated abdomen, the 

 whole being spotted with pink ; the form of the furcula and 

 fourth pergeopods are quite distinct, separating it from 

 C. isonyx, Steen. & Liitk.*, to which species it bears a 

 resemblance ; these authors lay great stress on the excavated 

 condition of the front border of the frontal plate, and the 

 secondary spur on the palp, which are not present in this 

 species ; their specimens were taken on a Sphyrcena in the 

 West Indies. 



Female. — Cephalothorax rounded, as broad as long; frontal 

 plates narrow. Lunulas very shallow. Anterior antennce : 

 first joint twice as long as the breadth of the lunule, the 

 front border provided with about fourteen fine plumose hairs, 

 the second joint is rather short and slender, with fine hairs at 

 the end. First maxilHped of the usual form, the second of 

 moderate size, the terminal claw without hair on the concave 

 border. Hamulus anterior not detected. Furcula quite 

 peculiar, rising from a broad base ; instead of ending in the 

 usual elongated branches, there appear to be two thickened 

 knob-like processes ; this condition was found in all the 

 specimens, and therefore was not due to fracture. I have not 

 met with this condition in any other species. First perceopod : 

 the basal joint bears a small lobe on the lower border, the 

 second has a minute spur on the outer extremity, and the 

 third carries three claws at the extremity of nearly equal 

 length and three long plumose setse from under border. 

 Second perceopod : the first and second joints of the outer 

 branch each carry a small spur-like claw on the upper border, 

 the third or terminal has three of smaller size, with six long 

 feathered hairs beneath ; the inner branch is three-jointed 

 as usual. Third perceojood has the paddle-branches placed 

 some distance apart ; the outer border of the second joint of 

 the outer branch bearing three short simple hairs, the inner 

 border four long plumose ones. Hamulus small and almost 

 straight. Fourth perceopod. of moderate length, four-jointed, 

 the last three joints as usual welded together, terminating in a 

 minute spur ; the last joint carries on the outer side a mode- 

 rately strong sharp simple claw, placed close to it equally 

 distant from one another are four flattened " toes," covered 

 with minute hairs like the tongue of a fly — two rising from 

 the last joint, one from the third, and one from the second. 

 Genital segment flask-shaped, the posterior border cut off 



* 'Bidrag til Kundskab/ 1861, pp. 18-19. 



