MCERA GROSSIMANA. 351 



is quite as long as the tail, and therefore is half the 

 length of the animal. The eyes are kidney-shaped, and 

 generally black. The superior antennae are long, being 

 about half the length of the animal, but the peduncle 

 forms at least two-thirds of its length, the secondary 

 appendage consequently appearing to be placed nearer 

 to the distal extremity than is usually the case. The 

 inferior antennae, likewise, have the peduncle forming a 

 considerable portion of the entire length of the organ, 

 which, however, does not reach beyond the extremity of 

 the peduncle of the superior. The coxae of all the legs 

 are short, and are but slightly developed in the form of 

 plates, clearly demonstrating the true relation of this 

 joint to the rest of the leg. The first pair of legs are 

 small, and have the hand but slightly dilated : it is oval 

 in form, and has the palm convex and imperfectly 

 defined. The second pair of legs have the hand very 

 large (whence the specific name) ; the hand is as long 

 as the head and the first two segments of the body, its 

 width being rather more than half its length ; the 

 superior and inferior margins are not parallel, and are 

 fringed with fasciculi of hairs; the palm is slightly 

 oblique, and furnished with one or two obtuse teeth, and 

 defined by a small sharp tooth. The walking legs are 

 nearly of the same length ; the last three have the thighs 

 but slightly dilated, their posterior margin being 

 serrated. The caudal appendages are long, but the last 

 pair is the shortest, and scarcely reaches beyond the 

 extremity of the preceding pair. The central caudal 

 appendage consists of two ovate plates, with the distal 

 extremity emarginate, the centre of which is armed with 

 a long and a short hair. 



When alive the animal is very transparent ; its colour 

 being faint yellow, tinted with rose. 



