42 CRUSTACEA. 



selves with the fingers bent, suddenly forming an angle; very short 

 ocular pedicles, projecting but little, if at all, from their cavities; a 

 stony and very uneven or spiny shell, designate the 



Parthenope, Fab. 



The lateral antennae of some are very short, not exceeding the 

 length of the eyes; the first joint is entirely situated under the ocular 

 cavities. 



If there are seven segments in the tail of both sexes, we have the 

 genus Parthenope properly so called(l) of Leach. 



If that of the males presents but five, it is his genus Lambrus{2). 

 The lateral antennae of the others are sensibly longer than the 

 eyes; their first joint extends to the superior internal extremity of 

 the cavities peculiar to these latter organs, and appears to be con- 

 founded with the shell. The post-abdomen is always composed of 

 seven segments. The claws of the females are much shorter than 

 those of the opposite sex. The same naturalist distinguishes these 

 Crustacea generically by the name of Eurynoma. But a single spe- 

 cies is known which inhabits the English and French coasts(3). 



All the other Parthenopes, one excepted(4) are from the Indian 

 Ocean. 



In the following ones, the claws always project, and their length, 

 at most, is double that of the body; their fingers are not suddenly 

 bent into an angle(5). 



Here the length of the longest feet — the second — barely exceeds 

 that of the shell from the eyes to the origin of the tail. The under 

 part of the tarsi is usually either dentated or spiny, or furnished with 

 a ciliated fringe terminated like a club. 



We will commence with those whose ocular pedicles are very 

 short, or of a mean length, susceptible of being entirely retracted 



(1) Par/Ztm.^omcfef, Fab.; liumph., Mas., IX, 1; Seba, III, xix,16, 17;Herbst., 

 XIV, 88. 



(2) Panth. longimana. Fab.; Rumph., Mas., VIII? — P. giraffa. Fab.; Herbst., 

 XIX, 108, 209; — P. lar, Fab.; — P. rubiis, Latr.; — Cancer conirarius, Herbst., Ix, 

 3; — P. macrocheles, Lat., Herbst., XIX, 107; — Cancer longimanus, L., fem., P. 

 trigonomana, Lat.; Cancer prensor, Herbst., xli, 3. 



(3) Cancer asper, Penn., Brit. Zool.,IV: Eurynoma aspera. Leach, Malac. Brit., 

 XVII. 



(4) Parthenope angulifrons, Latr., Encyc. Method.; Cancer longimanus, Ollvi. 



(5) The first joint of the lateral antennae appearing to form part of the shell, 

 has been mistaken by several naturalists, the second having been considered 

 by them as the first. 



