146 PROCEEDINGS OF THE AMERICAN ACADEMY 



37. Cambarus immunis. 



Gambarus immunis, Hagen, op. cit., p. 71, PL I. figs. 101, 102, 

 PL III. fig. 160, PL VIII. fig. b. 1870 (male, form I., and female). 



Cambarus immunis, Forbes, op. cit., pp. 4, 19. 1876 (male, 

 form II., and young). 



Cambarus immunis, Bundy, Proc. Acad. Nat. Sci. Phila., 1877, 

 p. 171. 



Cambarus signifer, Herrick, 10th Ann. Rep. Geolog. Surv. 

 Minn., p. 253. 1882. 



Hab. New York, Indiana, Illinois, Michigan, Wisconsin, 

 Minnesota, Iowa, Missouri, Kansas, Wyoming, Alabama, and 

 Orizaba, Mexico. 

 a. Var. spinirostris. 



Hab. Obion Co., Tennessee. 



In this form the rostrum possesses lateral spines at the base of 

 the acumen. 



38. Cambarus Mississippiensis. 



Cambarus Mississippiensis, Faxon, supra, p. 123. 

 Hab. Eastern Mississippi. 



39. Cambarus Palmeri. 



Cambarus Palmeri, Faxon, supra, p. 124. 

 Hab. Obion Co., Tennessee. 



40. Cambarus Alabamensis. 



Cambarus Alabamensis, Faxon, supra, p. 125. 

 Hab. Lauderdale Co., Alabama. 



41. Cambarus compressus. 



Cambarus compressus, Faxon, supra, p. 127. 

 Hab. Lauderdale Co., Alabama. 



42. Cambarus lancifer. 



Cambarus lancifer, Hagen, op. cit., p. 59, PL I. figs. 86, 87, 

 PL III. fig. 159. 1870. 

 Hab. Mississippi. 

 Hagen's type remains unique. 



43. Cambarus affinis. 



? Astacus limosus, Rafinesque, op. cit., p. 42. Nov., 1817. 

 Astacus affinis, Say, op. cit., p. 168. Dec, 1817. 

 Astacus affinis, Harlan, Med. and Phys. Res., p. 230, fig. 2. 

 1835. 



Astacus Bartonii, Milne Edwards, op. cit., II. 331. 1837. 



