NO. 1292. CRUSTACEANS OF NICKA.TA CK CA VE—HA Y. 437 



peds, and the long fingers are all characters in which the two resemble 

 each other. They differ markedly in the shape of the carapace, areola, 

 and hand, and the bod}^ and all the appendages in 61 hanmlatus are 

 more elongate and slender. The characters of dift'erence, however, are 

 undoubtedly due to the subterranean influences and are to be explained 

 as Dr, Lonuberg has explained the differences between C. archt-rontix 

 and C. darJk'i. 



Unfortunately we know^ only the second form male of C. jordani 

 and any comparison of the rather peculiar annulus ventralis of the 

 female of C. Jiamulatus with that of the other species is impossible. 



Of this species a series of twenty-six was obtained from Nickajack 

 Cave and one specimen from a small cave known as 

 Wine House Cave, about three-fourths of a mile 

 distant from Nickajack. 



Altogether there are fifteen females and eleven 

 males, and of the latter ten are in the second form 

 and one first form. 



In size the specimens range from 17 to 65 mm. in 

 length, both the extremes l)eing found in the fe- 

 males. Of the males the smallest is 33 and the 

 largest 65 mm. long. ... "h.,™:".":",.! 



Very little variation is observable in this series, of first form male. 

 and such as there is is confined to minute characters; 

 thus, in some specimens the cervical groove is arcuate, in others 

 slightly sinuate; in some the acumen of the rostrum is very slender, 

 in others stouter. In the larger specimens there are two or three 

 smaller spines, which are less developed or wanting altogether in the 

 smaller specimens. 



The first form male, which has hitherto not been observed, differs 

 from the second form in having slighly stouter chel», the hooks on 

 the third pair of legs are much stronger (in some of the second form 

 males they are wanting), the basal segment of the fourth pair of legs 

 is perliaps provided with a little larger knob, the first pair of abdomi- 

 nal appendages have the tips of the l)ranches sharply recurved, the 

 tips of the inner branch is slender, straight, and spiniform, and is 

 directed backward at right angles to the rest of the appendage and a 

 little outward; the outer branch is curved over the tip of the inner, it 

 is thin and blade like and horny. 



CAMBARUS LATIMANUS STRIATUS, new subspecies. 



7)/;a'.— U.S.N. M. 25019. Nashville, Tenn. E. B. AVilliamson, 

 collector. 



Dr. Faxon ^ was the first to call attention to certain aberrant speci- 

 mens of C. latimimus from Blount Spring, Cullman, and Bridgeport, 



^Eevision of the Astacidse, p. 69. 



