26o STALK-EVED CRUSTACEA 



elongated, with the joints subcyHndrical ; terminal joint 

 slender, styliform, but slightly compressed and not 

 ciliated. 



Range. — Atlantic ; in deep water. 



I. Geryon incertus. 



G cry 0)1 inccrtiis .... Miers. 



The carapace has its surface uneven and marked with 

 transverse granulated ridges, of which there are two on 

 the gastric region, placed one on each side of the median 

 line, and one crossing the middle of the carapace from the 

 base of the posterior antero-lateral marginal tooth, from 

 behind which also a granulated ridge extends along the 

 postero-lateral margins of the carapace nearly to the 

 postero-lateral angles, which are rounded. The orbit has 

 two small incisions in its superior margin. The antero- 

 lateral margins, shorter than the postero-lateral margins, 

 are armed with four teeth, of which the first, second, and 

 fourth are prominent and spiniform ; the third is almost 

 obsolete on one side, and on the other side is a small 

 tubercle. The front is rather prominent, about one-third 

 the width of the carapace, and divided by a small median 

 notch into two broad and slightly sinuated lobes, which 

 are rounded at the lateral angles. The antennules have 

 the basal joint very large. The basal antcnnal joint is 

 longer than the two following peduncular joints; the 

 flagellum is somewhat elongated. The third joint of the 

 external maxillipedes is longer than broad, with the inner 

 margin convexly arcuated ; the fourth joint is almost as 

 long as broad. The abdomen, in the female, is sub- 

 triangulate, with the segments short ; the last segment is 

 rounded distally. 



Range. — Bermuda ; in deep water. 



