1818.] OF THE UNITED STATES, 387 



characters, the present one certainly does not; but as 

 he further observes that, " cette espece se trouve en 

 grande quantite sur les cotes de PAmerique septen- 

 trionale," and that the posterior antennae are half as 

 long as the body, I conclude that he has certainly been 

 mistaken in the number of the feet of his specimen, and 

 has considered the anterior pair as palpi when describing 

 this animal. It is smaller and more slender than the pre- 

 ceding, and becomes red when dried. This species has 

 the same relation to the genus Talitrus as defined by Dr. 

 Leach, that the preceding one has. 



Genus PODOCERUS. Leach. 



Antewice pediform, inferiors longer, stouter, and with 

 the terminal joint inarticulate or very obscurely articula- 

 ted; two anterior pairs of feet monodactyle, hands dilated, 

 that of the second pair of feet larger, palm unarmed with 

 teeth. 



SPECIES. 



P. cylindricus^. Hands of the second pair somewhat 

 cylindrical; eyes small, not prominent. 



Inhabits Egg-harbour. 



Cabinet of the Academy. 



Eyes small; front acute; superior antenncs attaining 

 the tip of the third joint of the inferiores, inferior antenna 

 much thickened, hairy, the terminal joint shorter than the 

 preceding one; hand of the second pair, not larger than 

 the carpus, palm longitudinal, rectilinear, thumb much 

 shorter than the hand; third, fourth, and fifth pairs of feet 

 -short, much compressed, nail as long as the preceding 



