116 A REVISION OF THE ASTACID.E. 



tooth or projecting angle about midway from base to extremities; apical 

 forming a very obtuse angle with basal half." 



Female. — Fingers shorter than in the male; annul us yentralis with a 

 large tubercle on the posterior margin divided in the middle by a longitu- 

 dinal sinuous line, anterior border bituberculate, fossa deep, transverse. 



Measurements of a male, form II. — Length, 70 mm. Cephalothorax, 35 

 mm. Abdomen, 35 mm. From tip of rostrum to cervical groove, 24 mm. 

 From cervical groove to posterior border of telson, 10 mm. Length of 

 rostrum, 11 mm. Width of rostrum, 4.5 mm. Length of acumen of ros- 

 trum, 5 mm. 



Known Localities. — South Carolina: Saluda River (Coll. Butler Univ.). 

 Georgia: neighborhood of Rome (Etowah, Oostenaula, and Coosa Rivers). 

 Tennessee River near border of Georgia. Alabama : Cypress Creek, Lau- 

 derdale Co. 



The specimens described by Bundy were collected in the neighborhood 

 of Rome, Ga., by Prof. D. S. Jordan. Some of these specimens have been 

 communicated to me by Prof. 0. P. Hay, of Butler University, Irvington, 

 Ind., and Mr. P. R. Uhler, of Baltimore, Md. They embrace males of the 

 second form, females, and young. According to Bundy, only one out of the 

 nineteen specimens examined by him was a male of the first form. 



In general appearance this species i-esembles C affinis, but differs in 

 being smoother, in the shortness of the carapace behind the cendcal groove, 

 the single lateral spine, the absence of spines on the hepatic region, emar- 

 ginate epistoma, longer antennae, and in the form of the male appendages, 

 which resemble those of C. rusticus and G. obseurus. In these, however, the 

 male appendages are shorter, and the rami are shorter relatively to the 

 length of the whole appendage. 



The female specimen from the Tennessee River near the borders of 

 Georgia, mentioned by Hagen under C. extraneus as resembling C. affinis, 

 belongs to this species. Jordan also found C. spinosus in company with 

 ('. extraneus in the rivers explored by him in the neighborhood of Rome, 

 ( reorgia. 



In the collection of Butler University is a single female C. spinosus, col- 

 lected by Jordan in the Saluda River, South Carolina. In this specimen the 

 posterior section of the carapace is a little longer than in the Georgian i\ pes. 

 the distance from the cervical groove to the posterior border of tin' cara- 

 pace being equal to half the distance from the groove to the middle of the 



