ISOPODS OF NORTH AMERICA. 



307 



or tcrminiil .sogment has the convex anterior portion surmounted with 

 two very inconspicuously small tubercles, one on either side of the 

 median line. Its posterior exti'emity has a deep 

 rounded excavation, almost (juadrangular in shape. 

 The uropoda are longer than the t(n"minal abdomi- 

 nal segment. The inner branch has the outer 

 post-lateral angle produced in an acute point, the 

 inner angle being rounded. The outer branch is 

 longer than the inner branch, and terminates in 

 an acutely pointed extremity. 



The male differs from the female in its much 

 larger size, being 18 mm. long and 7 mm. wide; 

 in the more granular surface of the abdomen and 

 its V-shaped rather than rounded excavation, and 

 in having two depressed lines converging to a 

 point just anterior to the V-shaped excavation, 

 the apex of the point meeting the apex of the 

 V-shaped excavation. 



Four females and one male come from the gulf 

 weed. Collector unknown. 



Types in the Museum of Comparative Zoology at Harvard Univer 

 sity. Cat. No. 6733, M.C.Z. 



Fig. 332.— Paradynamene 

 benjamensis. female 

 (dorsal view). x h. 



Fig. 333.— Paradynamene BEN.iAMENSTs. a, First pleopod of mai.k. ■ l.'i;. h. 



OF MALE. X 15i. 



^KroND PI.EOrOD 



This species is named for Dr. Marcus Benjamin, editor of the Pro- 

 ceedhigs of the V. S. National Museum. 



52. Genus CILIC^A Leach. 



Last two segments of thorax of equal length. 



Abdomen composed of two segments, the first of which is usually 

 produced (at least in the male) in a long process directed backward. 

 The last segment of the abdomen has a median posterior emargination, 

 with or without teeth. 



