CRAYFISHES. 395 



however, in the Museum of Comparati^'e Zoology since the early days of the 

 Museum. This specimen, No. 243, was referred to C. hartonii by Dr. Hagen in 

 his Monograph and entered into his computation of the variability of the width 

 of the areola of that species, on p. 78. In my subsequent Revision of the Asta- 

 cidae, in 1885, p. 64, I referred to this individual as possibly a peculiar species 

 related to C. latimanus. 



In the shape of the body and the narrow areola C. ortmanni bears a close 

 resemblance to C. latimanus striatus, but in the outline of the rostrum and the 

 sculptiu-e of the claws it betrays a closer resemblance to C. hartonii. It is without 

 doubt an immediate offshoot of the latter, modified by fossorial habits; the nar- 

 row areola, broad, conical claws, small antennal scale, long, narrow and quad- 

 rangular epistome, all denote this. It forms a passage from C. hartonii to C. 

 latimanus on the one hand and on the other to the more eminently fossorial forms, 

 C. carolinus, C. diogenes, etc. 



Cambarus latimanus (Le Conte). 



There is a cotype, a dried male, in the Museum of Comparative Zoology, 

 No. 3,378, acquired by exchange of types with the Smithsonian Institution in 

 1861 ; another cotype, a dried female, is preserved in the collection of the Acad- 

 emy of Natural Sciences of Philadelphia. There are also in tlie Museum of 

 Comparative Zoology, No. 236, preserved in alcohol, 3 males of the first form, 6 

 males of the second form, 3 females, and 7 young, collected in Athens, Ga., and 

 sent to Professor Agassiz by LeConte in the 50's. These are essentially para- 

 types, and are of interest as fixing the type locality, Athens, Ga., which was not 

 specified in Le Conte's original description of the species nor on the labels accom- 

 panying the type specimens in Cambridge and Philadelphia. 



Two males, dried, M. C. Z., No. 3,366, sent by Prof. Lewis R. Gibl^es from 

 South Carolina as C. hartonii, without precise locality, are the only specimens 

 reported from South Carolina so far as I know. 



A small young female from Milledge\'ille, Ga. (M. C. Z., No. 3,365) and 

 another from Roswell, Ga. (M. C. Z., No. 3,502) probably belong to this species. 



Specimens from Blount Spring and Cullman, Ala. (U. S. N. M., No. 4,953, 

 M. C. Z., No. 3,639) differ from the typical form in having a narrower rostrum, 

 and in specimens from Bridgeport, Ala., and Nickajack Cave, Ashland City, 

 and Nashville, Tenn., the divergence from the type is so pronounced that Mr. 

 W. P. Hay has described them as a subspecies, C. latimanus striatus (Proc. U. S. 

 Nat. Mus., 1902, 25, p. 437; type locahty, Nashville, Tenn.). 



