460 Illustration of a Species of ? Phyllosoma, 



in number, seated on peduncles, and these attached to the 

 front edge of the carapace, above the antennae. The two ex- 

 terior antennae (if such they can be called) hornlike, not 

 visibly articulated, divided into two strong spines ; the first 

 inclined downwards, the other straight in front : the two in- 

 termedial antennae articulated, and divided at the third joint 

 into two setaceous terminations. 



The second portion includes the thorax and abdomen, both 

 bright and transparent, and scarcely visibly distinct from 

 each other. The thorax is oval, angular, and spined above 

 and beneath the insertion of each leg. The abdomen (e) 

 consists of six segments, terminating with two sharp spines 

 on the caudal plate. The four upper segments furnished with 

 two double spine-like processes beneath the edge of the ab- 

 domen. The penultimate segment has on each side two flat 

 oval plates, serving as fins, and is succeeded by the caudal 

 case, which is rounded at the margin, and bears two promi- 

 nent spines on the upper side. 



a and b represent the animal exactly of the natural size, and 

 show the form and disposition of the limbs, fourteen in number. 

 The first pair, situate near the mouth, of four joints, the last 

 joint possibly didactyle; over the insertion of the first joints 

 are seen two small tubercles, which in the remaining pairs are 

 produced into sharp spines, inclined outwards. The second 

 pair long, reaching to the antennae, setaceous and ciliated. 

 The four next pairs, alike, long and furnished with a single 

 hook or nail, ciliated and spined at the joints ; at the base of 

 the third joint is a process consisting of two pieces, the last 

 setaceous and jointed, not unlike the antennae of some of the 

 species of .M>ctua. The last pair of legs short, of four joints, 

 hooked, and placed horizontally near the first abdominal seg- 

 ment. 



The mouth, situate beneath the carapace, is visible through 

 it, minute, prominent, and provided with jaws appearing in 

 the form of a ring, supported on each side by a crescent- 

 shaped plate, spined beneath, and attached to the sternum, 

 which connects it with the carapace. 



The only marks on this singular crustacean were a few 

 dark dusky blotches, near the eyes, upon the antennae, and at 

 the joints of the legs ; the mouth and the last portion of the 

 longest legs were minutely dotted with crimson. 



To the genus Phyllosoma, as noticed in the Dictionnaire 

 des Sciences Naturelles, this specimen bears a resemblance, 

 but differs in the number of the legs, and in their termination. 

 Five species of Phyllosoma are there described by Desmarest, 

 first noticed by Leach and Latreille ; since which Guerin, in 

 his " Monographic" has mentioned others. They are all 



