CAMBAKUS. 33 



10. Cambarus spiculifer. 



Plate II. fig. 5. 



AstacMS spiculifer, LE CONTE, Proc. Acad. Nat.. Si-i. Phila., VII. 401, 1855. 



anu ipievlifer, UAGEN, 111. Cat. Mas. Comp. Zool., No. 111. p. 48, PL I. figs. 59-62, PL III. fig. 147, 



1S70. 

 Cambarits sjiii-afifir, FAXON, Proc. Amcr. Acad. Arts and Sci., XX. 138, 1884. 



Known Localities. Upper Georgia : Oconee River at Athens and Milledge- 

 ville ; Ocinulgee River in the neighborhood of Atlanta (Coll. Butler Univ., 

 from D. S. Jordan) ; Chattahoochee River at Roswell, Cobb Co., and iK-ar 

 Gainesville ; Etowali River (Coll. Butler Univ., from D. S. Jordan). 



There is a male type, form I., in the Museum of Comparative Zoology, 

 and one in the Academy of Natural Sciences of Philadelphia. 



In none of the specimens seen by me are there three spines on each 

 side of the basal segment of the telson, as is said by Hagen to be some- 

 times the case (p. 49), nor have I seen an individual with but one lateral 

 thoracic spine (Hagen, p. 50). I think these statements are based upon 

 erroneous determinations, for in the jarful of specimens from Athens, Ga., 

 labelled Gcoitlanis spiculifer by Hagen, I find the young of C. Lccontei, which 

 has a trispinous telson and one lateral thoracic spine. 



Measurements of a male, form II. Length, 71.5 mm. Carapace, 34.5 mm. 

 Abdomen, 37.5 mm. From tip of rostrum to cervical groove, 25.5 mm. ; from 

 cervical groove to posterior margin of carapace, 9 mm. Length of rostrum, 

 11.25 mm. ; breadth of rostrum at base, 5.5 mm. ; between lateral spines, 

 2.75 mm. Length of chela, 29 mm. ; breadth of do., 11 mm. Width of areola, 

 3.5 mm. The largest specimen seen by me is 97 mm. long, male form II. 



Cambarits sjilcuJifcr has been found as yet only in Upper Georgia, in the 

 Altamaha and Chattahoochee River basins. 



C. Lccontei, C. auffiisfattis, C. pubescens, C. spiculifer, and C. versntus are dis- 

 tinguished from the other species of Group I. by the shortness of the 

 cardiac region of the carapace. C. Lccontci, C. angustaius, and C. pulescens 

 have one lateral thoracic spine on each side ; C. spiculifer and C. vcrsutu* 

 have two. C. Leconiei and C. anyustatus have subcylindrical hands, areola 

 of moderate width, rostrum smooth and hollowed out above ; C. pube-scens 

 has broader hands and areola, rostrum pubescent and subplane above. In 

 C. anr/ttx/a/tis the sides of the rostrum are subparallel ; in C. Lecontci the 

 rostrum is more tapering. In both C. tpicultfer and C. versutns the areola is 



