78 A REVISION OF THE ASTACID.K. 



dentiform tubercles, outside of which is a row of smaller tubercles. Fingers 

 compressed, punctate and costate, movable linger with a single row of tuber- 

 cles (in the outer edge, a prominent rib running along the middle of the 

 upper surface, inner margin excised at base and furnished with tuberculiform 

 teeth; external finger toothed within, bairy at base, outer border marginate. 

 Carpus armed with a strong tooth and a few small scattered tubercles on 

 the inner side, a stout median anterior spine beneath, and two or three 

 smaller ones between the median and internal spine. Superior border of 

 meros serrate, inferior surface with two longitudinal rows of spines. Second 

 pair of legs densely ciliate on the inner side near the tip. Third pair of legs 

 hooked. First pair of abdominal appendages of male and annulus of female 

 as in C. Diogenes. 



Length, 65 mm. Carapace, 30.5 mm. Rostrum, G.5 mm. 



Known Localities. — Maryland : Caroline Co. (Coll. P. R. Uhler) ; Dorches- 

 ter Co. ; Talbot Co. (Coll. P. R. Uhler); St. Mary's Co. (Coll. P. R. Uhler); 

 Wicomico Co. (Coll. P. R. Uhler); Somerset Co.; Worcester Co. 



This species was discovered by Mr. P. R. Uhler, of Baltimore, in the 

 counties of Maryland enumerated above, on the Chesapeake and Atlantic 

 coasts of Maryland. It is found in salt marshes, covered twice daily by the 

 tides, and also in brackish and fresh-water ditches in company with C. Blan- 

 dingii. In Dorchester County it is found far back in the lowlands in the 

 neighborhood of Vienna. 



(J. Vhlei'i is easily distinguished from C. Diogenes and C. argillicola by its 

 plane rostrum, shape of the hand, etc. 



30. Cambarus Girardianus. 



Plate IV. Hg. 1, Plate IX. figs. 2 a, It a. 



Cambarui Girardianus, Faxon, Proc. A.mer. Acad. Arts ami Sci., XX. L17, L884. 



Male, form 11. — Post rum broad, excavated, margins with a line of 

 puncta, slightly convergent ; acumen long, ending in a brown corneous 

 upturned tip; a pair of minute, brown horny teeth at base of the acumen. 

 Post-orbital ridges depressed, with sharp anterior spines. Cephalothorax as 

 long as the abdomen. Carapace flattened above, densely and finely punc- 

 tate, slightly granulated and finely ciliated on the branchial and hepatic 

 regions. Cervical groove sulcate, sinuate, with minute lateral spine, and 

 terminating with a small branchiostegian spine: external angle of the orbit 



