134 PROCEEDINGS OP THE AMERICAN ACADEMY 



base of the rami has a projecting angle or shoulder, but in most speci- 

 mens this is not evident. 



Female. Fingers straighten Base of external finger has a dense 

 beard on the inside ; in a few of the specimens seen the fingers are 

 longer, nearly straight, their opposed margins almost meeting through- 

 out their length. Annulus ventralis bilaterally symmetrical, anterior 

 margin bituberculate, posterior margin unituberculate, fossa transverse. 



Dimensions of a male, form I. : — Length of body, 38 mm. Length 

 of carapace, 19.5 mm. Length of abdomen, 18.5 mm. From tip of 

 rostrum to cervical groove, 14 mm. From cervical groove to posterior 

 border of carapace, 6 mm. Length of rostrum, 5 mm. Length of 

 acumen of rostrum, 2 mm. Width of areola, 1 mm. Length of an- 

 tenna, 36 mm. Length of chela, 16 mm. Breadth of chela, 7.5 mm. 

 Length of movable finger, 10.5 mm. 



The largest female specimen is 60 millimeters in length. 



Cyprus Creek, Lauderdale Co., Ala. 



Nine specimens, four males of the first form and five females, col- 

 lected by C L. Herrick for the U. S. National Museum, October, 1882. 



This is a small species with large hand, slender fingers widely sep- 

 arated at base and meeting only at the tips. In the female, there is a 

 heavy beard at base of external finger on the inner side. 



In the summer of 1872 I collected in a brook at Knoxville, Tenn., 

 six specimens, three second form males and three females, which 

 closely resemble those obtained by Mr. Herrick in Alabama, and be- 

 long, I think, to the same species. The external finger of the males 

 is densely bearded within at the base, as in the females from Lauder- 

 dale Co., Ala., the first abdominal appendages reach forward to the 

 base of the second pair of legs, are bifid at the tip, the internal and 

 external parts are thick, blunt at the tip, the outer somewhat longer 

 than the inner, and slightly recurved at the tip. 



§ 5. Second and third pairs of legs of male hooked. 

 21. C. Shufeldtii, sp. nov. 



Male, form I. Rostrum plane above, margins a little convergent, 

 raised into a slight rim from the base to the lateral spines, which are 

 prominent and acute; acumen of moderate length, acute, pubescent. 

 Post-orbital ridges with anterior spines. Carapace smooth, a sharp 

 spine on the cervical groove on each side ; sub-orbital angle prominent, 

 branchiostegian spine present. Areola of moderate breadth. Telson 

 bispinous on each side. Epistoma triangular. Antennal scale broad. 



