14G TROCEEDINGS OF THE AMERICAN ACADEMY 



37. Caaibauus immunis. 



Cambarus inimitnls, Ilagen, o/). cit., p. 71, PL I. figs. 101, 102, 

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



Cambarus immunis, Forbes, op. cit., pp. 4, I'J. 1«7G (male, 

 form II., and young). 



Cambarus immunis, Bundy, Proc. Acad. Nat. Sci. Pliila., 1.S77, 

 p. 171. 



Cambarus signifcr, Ilcrrick, lOtli Ann. Rep. Geolog. Surv. 

 Minn., p. 2.'>3. 1882. 



I lab. Kew York, Indiana, Illinois, Michigan, Wisconsin, 

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

 Orizaba, Mexico. 

 a. Var. spinirostris. 



Ilab. 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. 

 Ilab. Eastei-n Mississippi. 



39. Cambarus Palmeri. 



Cambarus Palmeri, Faxon, supra, p. 124. 

 Ilab. Obion Co., Tennessee. 



40. Cambarus Alabamensis. 



Cambarus Alabamensis, Faxon, supra, p. 125. 

 Ilab. Lauderdale Co., Alabama. 



41. Cambarus compressus. 



Cambarus compressus, Faxon, supra, p. 127. 

 Ilab. Lauderdale Co., Alabama. 



42. Cambarus lancifer. 



Cambarus lancifer, Ilagen, op. cit., p. o9, PL I. figs. 8G, 87, 

 PL IIL fig. 159. 1870. 

 Ilab. Mississippi. 

 Ilagen's type remains unique. 



43. Cambarus affinis. 



f Astacus limosus, Rafinesque, op. ciL, p. 42. Nov., 1817. 

 Astacus affinis, Say, op. cit., p. 108. Dec, 1817. 

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

 1835. 



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



