DECAPODA. ASTACIDJE. 



MACROURA. 



GENUS NEPHROPS. Leach. 



Cancer, Linn. Herbst. 



AsTACUS. Fabr. Penn. Latr. 



Nephrops. Leach, Edwards. 



Generic Character. — External antennce with the scale of the 

 first joint extending to the extremity of the peduncle. Internal 

 antenncB with the basal joint very broad, triangular, terminating 

 in two setce, the superior much thicker than the inferior, and 

 slightly compressed. External pedipalps much elongated, the second 

 joint the longest. Ei/es very large, reniform. First pair of feet 

 very long, unequal ; the hands quadrangular, the angles carinated 

 and strongly toothed ; the fingers armed with strong tubercles : 

 these and the second and third pairs are didactyle; the fourth and 

 fifth monodactyle. Abdomen semi-cylindrical, sculptured; the 

 lateral processes of the segments laminar and thin. Carapace 

 terminating in a long rostrum, strongly dentate on each side. 



This genus consists but of a single known recent species. 

 It is nearly allied to Homarus and to Astacm, and may- 

 be considered as in some respects intermediate between 

 them. 



