Cerapus^ Uuclola., and Lepidactylis. 271 



sile, edi;e irregiilur in outline, minutely deiitjitc^ und armed with 

 setae. The duetyhis is a little .shorter than the projxxlus, stout, but 

 much narrower at base than the distal end of tlie i)ropodus, regularly 

 curved, and tlie prehensile edge minutely serrate and armed with a 

 very few niiinite setae. 



The first and second peneopods are nearly alike and differ only 

 slightly in tlie dittereiit sexes, and, as in the allied genera, are modi- 

 fied for tul)e-l)uil(ling, the bases being very large and their interiors 

 almost wholly oceujiied with the eement-glands. In the male the 

 basis in the first pair (Plate Ila, figure 8) is articulated at the ante- 

 rior angle of the broad and truncated proximal end, while the poste- 

 rior angle of the same end is jirominent and angular. In the second 

 pair the basis is of similar form, but considerably broader in the 

 middle, and the posterior angle of the distal end does not project 

 and is broadly rounded. In both pairs the ischium is a little longer 

 than broad ; the merus is of about the same length but broader than 

 long and with both edges convex in outline ; the carpus is scarcely as 

 long as the merus and nearly square ; the propodus is narrower but 

 nearly a half longer than the carpus ; the dactylus is shorter than 

 the propodus and only slightly curved. In the female the basis in 

 the first pair is proportionally broader than in the male, and the pos- 

 terior angle of the distal end projects in a rounded lobe separated 

 from the rest of the posterior edge by a nuirked emargination. In 

 the second pair the basis is only somewhat broader and more oval in 

 outline than in the male. 



The third, fourth and fifth peroeopods are alike in the two sexes 

 and are reversed aiul turned u[)ward above the back, with the hooked 

 dactyli directed vipward and outward. The third pair (Plate Ila, 

 figure 4, «, h) are very small, being only a little longer than the basis 

 in the third pair, and in the female scarcely longer than the segment 

 to which they belong. The basis makes more than a third of the 

 entire length, is as long as the ischium and merus together and 

 nearly as broad as long. The ischium is very short and broader than 

 long. The body of the raerus is ovoid with the proximal end trun- 

 cate, and has a long, narrow and spatulate process projecting from the 

 postei-ior edge near the articulation with the ischium and tipped 

 with one short and three long, plumose setae. The carpus is articu- 

 lated upon the middle of the posterior side of the merus and near 

 the base of the spatulate process, to which it approaches in size and 

 foi-m ; it is tipped with a single seta and the terminal portion is 

 I'oughened with very minute scale-like teeth pointing distally. The 



