274 SPECIFIC DESCKIPTION. 



and anterior to the posterior extremity of the 

 sixth segment. 



The eyes are small, and placed upon peduncles, 

 that gradually taper from the base to the ex- 

 tremity. The first pair of antennas are short, 

 and developed upon the type of those of the 

 brachyura; but the first joint is reduced to a 

 size that is only about twice the diameter of the 

 second. The second pair of antenna are but 

 little longer than the first, and are furnished 

 with a broad round scale at the third joint, and 

 a terminal fiagellum, that is about the length of 

 the fifth joint of the peduncle. The squamiform 

 appendage is circular and dishlike; the inner 

 margin is straight, or somewhat excavated. 



The second pair of gnathopoda have the third 

 joint much broader than the fourth (the second- 

 ary appendage reaches not to the extremity of 

 the third), and have the terminal joints small 

 and rudimentary. The first pair of pereiopoda 

 are subequal in the female, the propodos upon 

 the right side being somewhat larger than on the 

 left; the surface is smooth and even, and the 

 dactylos is furnished with a prominent carina, 

 that terminates abruptly near the basal articula- 

 tion, and loses itself gradually towards the apex. 

 The fifth pair of pereiopoda are completely 



