500 MR. C. SPENCE BATE [NoV. 24, 



Rostrum deeper than the cephalon, the extremity being the deepest 

 part ; the anterior margin shghtly excavate, and armed with nine 

 small teeth. The rostrum is also furnished with a tooth upon the 

 dorsal surface, immediately above the eyes. The pleon is robust, and 

 but slightly curved. The eyes are small, and planted upon a short 

 peduncle. The superior antennae reach beyond the extremity of the 

 rostrum. The inferior antennae are imperiiect, but are at least more 

 than one-third the length of the animal ; the squamiform appendage 

 is acuminate, subapically tipped with a tooth, and reaches to the ex- 

 tremity of the rostrum. The first pair of gnathopoda are short, 

 spatuliform, the distal extremity being fringed on the inner margin 

 with small but strong spines. The first pair of pereiopoda are much 

 shorter than the second, and by their peculiar formation afford the 

 distinctive character that distinguishes this genus from Hippolyte : 

 the propodos is long, ovate, and attached to the inferior process of a 

 hollow or widely crescent-shaped carpus ; this is ovate, slightly taper- 

 ing to the dactylos, which is internally concave, and impinges against 

 a similarly formed process of the propodos. The second pair of pereio- 

 poda are longer than the second gnathopoda, slender and chelate, the 

 propodos being stoutest at the carpal extremity, from which it nar- 

 rows to the dactylos, which is internally hollow or spoon-shaped, and 

 antagonizes with a similarly shaped i^rocess at the extremity of the 

 propodos. The three posterior pairs of pereiopoda are longer and 

 rather more slender than the preceding, are armed upon the posterior 

 margin with five or six equidistant solitary spines, and terminate 

 in an unguiculate dactylos ; the posterior pair of pleopoda are about 

 the same length as the telson. Telson terminating obtusely, armed 

 with two strong spines at the apex, and subapically furnished with 

 a short cilium. 



The colour of this species when alive was not recorded by Mr. 

 Angas ; but since death it has assumed an orange tint, deepening 

 to a red along the line of the primae vise. 



This description is taken from a female loaded with ova, amongst 

 which were found two specimens of the larva of a Bopyroid Crustacean. 



This animal, like the preceding, was captured in about A\ fathoms 

 of water in St. Vincent's Gulf, on weedy ground, about four miles off 

 the land. 



Division B. Having a fixed denfAculated second process on the 



mandible, 



Caradina cincinnxjli. (PI. XL. fig. 3.) 



C. rostri mar [fine dorsali Icevi et cincinno parvo supra extremita- 

 tern tertii segmenti posteriorem regionis dorsalis. Pleontis an- 

 tenna superiore quam rostrum longiore, antenna inferiore quam 

 corpus breviore. 

 Length |ths of an inch. 



The back of the carapace is smooth, projecting anteriorly into a 

 rostrum that is only carinated below and armed with six teeth. The 

 pleon is likewise smooth ; but the third segment is slightly gibbose. 



