ISOPODS OF NORTH AMERICA. 



435 



separated by a deep and wide incision between the segments. The 

 segments are about equal in length. Epimera are present on all 

 the segments. On the first three they .are small and narrow plates 

 placed 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, 



FIG. 491. C^ECIDOTEA 8TYGIA. a, TERMINAL SEG- 

 MENT OF BODY AND UEOPODA. X 20J. 6, MAX- 

 ILLIPED. X 38 j. C, FIRST LEG. X 20i- (I, 



MANDIBLE, x 38f. 



elongate, the posterior margin being 



almost truncate, the median terminal FIG. 492. (AFTER HAY.) a, ABDOMEN AND 

 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 greatly dilated 

 and armed on the inferior margin with two long triangular processes 

 and three short ones. All the other legs are ambulatory. 



UROPODA OF C^OIDOTEA STYGIA (MAM- 

 MOTH CAVE), b, UROPOD OF C.ECIDOTEA 

 NICKAJACKENSIS (METCALF, GEORGIA). C, 

 ABDOMEN AND UROPODA OF C^CIDOTEA 

 RICHARDSON.*; (NlCKAJACK CAVE). (I, 

 GNATHOPOD OF C^ECIDOTEA NICKAJACKEN- 

 SIS (METCALF, GEORGIA), e, FIFTH LEG OF 

 C^ECIDOTEA NICKAJACKENSIS (METCALF, 

 GEORGIA). /, FIFTH LEG OF OECIDOTEA 



RICHARDSON^. (NlCKAJACK CAVE). g, 



FIFTH LEG OF CAICIDOTEA STYGIA (MAM- 

 MOTH CAVE). 



