38 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 86 



The following description has been prepared from the Tennessee 

 and North Carolina specimens to facilitate comparison with the 

 other species of the genus : 



Description. — ^Large but moderately slender animals; 45 to 58 mm 

 long and 2.5 to 3.1 mm broad. The specimens examined had 56 to 65 

 segments. Some of Bollman's specimens had as few as 50 segments. 



Head having eyes composed of four to eight ocelli in a single series 

 paralleling and almost covered by the first segment. Antennae mod- 

 erately stout ; joint 2 the longest ; joint C the broadest. Clypeus with 

 six setif erous punctures ; labrmn with 16 smaller ones. Mandibulary 

 stipes with the lower half slightly depressed for the reception of the 

 antennae. Gnathochilarium with mentmn in two distinct parts, the 

 basal one broader at its apex than the bottom of the upper part. 



First segment as long as the three succeeding segments combined 

 and broader than any of the anterior segments; surface smooth; the 

 lateral margin distinctly rimmed ; posterior angles slightly produced 

 backward. 



a b 



FiGUKB 11. — Cambala annulata (Say) : a, Anterior gonopods, anterior view; b, posterior 



gonopods, lateral view. 



Behind segment 1 the ensuing segments are considerably narrowed 

 and then increase gradually in breadth to near the middle of the 

 body. Segments 2 and 3 have small distinct crests in the same posi- 

 tions as those on the ensuing segments, the lateral carinae are no 

 longer than the dorsal crests, but on segment 4 the lateral carinae 

 are slightly more prominent than the dorsal crests. Segment 2 has 

 a high, conspicuous ridge on each side just behind the posterior corner 

 of segment 1. 



On the succeeding segments there are four very prominent crests 

 between the poriferous carinae, intervals between the crests equal but 

 narrower than the interval between the outer dorsal crest and the 

 adjacent poriferous carina, these latter more prominent than the dor- 

 sal crests, the anterior three-fifths thickened and inflated into an 

 ovate process somewhat oblique to the side of the body with the pore 

 near its posterior third; behind the thickened process the carina is 

 abruptly retracted, forming a short, thin ridge about as high as 



