CAMBARUS. 63 
(Neuse River basin). It is doubtfully reported from South Carolina and 
Georgia; but its place seems to be largely taken in those States by the 
nearly related C. dutimanus. Lake Superior and Osage River are isolated 
Western localities from which C. Barton is reported. 
As a rule, C. Barton prefers the cooler waters of mountain regions or 
uplands, while the clay bottoms and marshes, both on the east coast and in 
the Western prairie country, afford the related C. Diogenes. According to Dr. 
C. C. Abbott, C. Bartonii in the neighborhood of Trenton, N. J., burrows in 
the muddy banks of ditches, small streams, and of the Delaware River. He 
says: “The burrows of Cambarus Bartonii, so far as we have discovered them, 
have all been in the banks of the smaller streams and meadow ditches (and 
occasionally a colony of burrows in the river bank, where peculiarly favor- 
able), a little below the usual water line.” It is not, however, pre-eminently 
a burrowing species, like its cousin, C. Diogenes, being more commonly found 
under the stones in clear streams and in springs. In the U. 8. National 
Museum are young specimens found in a spring in Clarke Co., Va., the 
temperature of whose water is 67° F. The observations of Dr. Godman * 
upon the habits of a burrow-dwelling species probably relate to C. Bartonit. 
According to Dr. John Sloan, of New Albany, Ind., C. Bartoni is found 
in ponds and still water in that locality, C. Sloan beimg the common form 
in the running streams. 
The well-known occurrence of C. Bartonii with well-developed eyes in 
the Mammoth Cave of Kentucky is mentioned on p. 41. Mr. A. R. Crandall 
has also collected it in Lineville Cave, near Blountsville, Tenn. 
As might be expected in a species with such an extended geographical 
range, C. Bartonii is subject to considerable variation. The variations affect 
especially the rostrum, areola, antennal scale, epistoma, and chele. In the 
common Eastern form, the rostrum is short, broad, nearly plane above, the 
sides nearly parallel from the base to near the tip, where they suddenly 
converge to form the short acumen. The antennal scale is narrow. The 
areola is rather narrow, with two or three longitudinal rows of impressed 
dots. The chele are coarsely punctate, the internal margin of the hand sub- 
tuberculate, the fingers gaping at base. To the westward, in the Alleghany 
Mountain region of Virginia, and in the Ohio River basin, specimens are 
found in which the rostrum is longer and narrower, the margins converging 
* Rambles of a Naturalist, with a Memoir of the Author, Dr. John D. Godman, p. 42. Philadelphia, 
1859. (Republished from “ The Friend.”’) 
