ISOPODS OF NORTH AMERICA. 



485 



soparated by a deep and wide inci.sioii between the segments. The 

 segments are about eciual in length. Kpimcra are present on all 

 the segments. On the tii-st thiee they .are small and narrow plates 

 phu'(>d just below the antero- lateral angles. On the fourth segment 



they occupy the middle of the 

 lateral margin. On the last 

 three segments they are post- 

 laterally placed. 



The first two segments of the 

 abdomen are short. The third 

 or terminal segment is narrow, 



Fi(}. 491.— Cecidotea stygia. ((, Terminal seg- 

 ment OF BODY and UROPODA. X 20i. h, MAX 



iLLiPED. X 38|. e, First leg. x 20^. </, 

 Mandible, x 38J. 



elongate, the posterior margin being 

 almost trimcate, the median terminal fig. 49 

 lobe being broadly rounded and not 

 prominent, almost vanishing. The 

 terminal segment is one and a half times 

 longer than wide, 2 mm.: 3 mm. The 

 uropoda are about as long as the termi- 

 nal segment. The peduncle is long and 

 narrow and is about two-thirds as long- 

 as the terminal segment. The inner 

 branch of the uropoda is two-thirds as 



long as the peduncle. The outer branch is two-thirds as long as the 

 inner branch. In the female the first pleopoda are attached close 

 together. 



The first pair of legs are prehensile, with propodus greath' dilated 

 and armed on the inferior margin with two long triangular processes 

 and three short ones. All the other legs are ambulator^-. 



(After Hay.) <i. Abdomen and 



uropoda of C.KCIDOTEA STYGIA (MAM- 

 MOTH Cave), b, Uropod ok C.kcidotea 



NICKAJACKENSIS (METCALF, GEORGIA). <', 



Abdomen and uropoda of C.kcidotea 



RICHARDSON.E (NlCKAJACK CaVE). ({, 

 GNATHOPOD of C.ECIDOTEA NICKAJACKEN- 

 SIS (Metcai.f, Georgia), c. Fifth leg of 



CECIDOTEA NICKAJACKENSIS (MeTCALF, 



Georgia). /, Fifth leg of C^cidotea 

 richardson.15 (Nickajack Cave). </, 

 Fifth leg of C.*;cidotea .stygia (Mam- 

 moth Cave). 



