4 A REVISION OF THE ASTACIDA. 
short conical tubercle of the basal segment of the antennule. The third (in 
CO. Montezume and C. Shufeldtii the second and third), or the third and fourth 
pairs of legs in the male, have a prominent tubercle or hook on the anterior 
border of the third segment. The first pair of abdominal appendages in the 
male are terminated by styles, hooks, or teeth.* A more or less mobile 
annulus is situated on the sternum of the female, just behind the penulti- 
mate thoracic somite; and in this sex the first pair of abdominal appen- 
dages, though much smaller than the succeeding pairs, and simple, are 
somewhat larger than in the genus Astacus. The telson is clearly divided 
by a transverse suture. 
The genus Cambarus is widely distributed over the North American con- 
tinent, from Lake Winnipeg to Guatemala, from New Brunswick to Wyoming 
Territory. For a fuller account of the geographical distribution of the genus, 
the reader is referred to page 178. 
Bibliography of the Genus Cambarus, from the Year 1868 to the 
Present Time. 
Although seventeen years have elapsed since the genus Cambarus was 
revised by Dr. Hagen, $ but little has been added to our knowledge of these 
animals durmg that period. The bibliography of the genus down to the 
year 1868 has been given with sufficient fulness on pages 5-12 of Hagen’s 
memoir. I will briefly mention the works published since that date which 
treat of these animals. 
1871. E. D. Cope, in an article entitled “Life in the Wyandotte Cave,” in the 
Indianapolis Journal, Sept. 5 (reprinted in Ann. and Mag. of Nat. Hist. 4th Ser. 
Vol. VIII. pp. 868-370), records the capture of a blind crayfish in the Wyandotte Cave, 
Crawford Co. Ind. It is considered to be the same as the Mammoth Cave species, 
C. pellucidus. 
1872. In a “Report on the Wyandotte Cave and its Fauna” (Third and Fourth 
Ann. Rep. Geolog. Surv. Ind., pp. 157-182; Amer. Nat., Vol. VI. pp. 406-422), Cope 
gives a fuller account, accompanied by a figure, of the Wyandotte Cave species, which, 
alter comparison with C. pellucidus, he concludes to be a new species. This he names 
Orconectes inermis, establishing a new genus for the reception of the two blind species. 
* A detailed description of these appendages will be found on page 17 of Hagen’s Monograph of the 
North American Astacide, 
T See Hagen, op. cit., p. 19. 
$ Monograph of the North American Astacide, by Dr. Hermann A. Hagen. Ill. Cat. Mus. Comp. 
Zo0l., No. IL. (Mem., Vol. II. No. 1), 1870. This monograph was finished in 1868, although not published 
till two years later. 
