GAMMARIDEA. 341 



superioribus brevioribus. Styli caudales 2>tii ramis duobus ccmfecti, 

 uno subconico apice uncinate altero paido compresso. Antennae supe- 

 riores appendiculatae. 



Very similar to Podocerus, the hands of the second pair being very 

 stout, the antennae pediform, the superior pair the shorter. The 

 caudal stylets of third pair with two branches, one subconical and 

 uncinate at apex, the other somewhat compressed. Superior an- 

 tennce appendicidate. 



The appendiculate character of the superior antennae is the only 

 essential point of difference between Cratophium and Podocerus. 

 This accessory branch consists but of a single joint. The legs of the 

 five posterior pairs have nothing peculiar. The basal joints of the 

 six posterior legs are quite broad in the species observed. 



The two forms under C. validum may be male and female of the 

 same species, and are here so described, although we somewhat doubt it. 

 The females were well furnished with eggs, and were collected at the 

 same time with the males. They are remarkable for the large size of 

 the hands of the secoud pair in this sex. The tarsi of the ten poste- 

 rior legs are without a seta below near apex. 



The abdomen was often flexed beneath the body in the specimens, 

 but never thrown up as close to the venter as in the Platophia. 



Cratophium validum. 



Maris : — Caput segmentis duo sequentibus vix brevius, ad oculum utrin- 

 que paulo saliens. Antennce infra ciliatos; superiores graciliores, 

 flagello 5-articulato (articulo \mo oblongo) confectce, inferioribus parce 

 breviores, articulo 3tio breviore quam 2dus; inferior es valde crassw, 

 articulo 4to multo longiore quam Stius, 5 to Stium fere wquante, 

 duobus sequentibus (idtimis) minutis. Pedes antici parvi, maim sub- 

 ovatd; 2di validissimi, manu oblongd, crassd, nudd, infra prope 

 basin digito immobili longo crasso instructd, digito mobili longiore, vix 

 curvato. Styli caudales Stii ultra lmos vix producti. Pedes 6 postici 

 setis paucis brevibus ornati. 



Feminae : — Corpus crassius. Pedes 2di manu validd et vix minore 

 confecti, manu oblongd, supra arcuatd, infra fere excavatd 2>-den- 



211 







