116 PROCEEDINGS OF THE AMERICAN ACADEMY 



Areola linear in the middle, with an anterior and posterior triangular 

 space, the latter the larger. Abdomen broad, but narrow at the base, 

 longer than the cephalo-thorax. Telson uni- or bi-spinose on each 

 side. Epistoma' rounded in front. Antennal scale small, rounded 

 within. Third maxillipeds heavily bearded within, lightly so beneath. 

 Chela large, hand swollen, denticulate on inner border, irregularly 

 punctate, fingers flattened laterally, punctate and costate ; the mova- 

 ble finger has a single row of tubercles on external border and a very 

 prominent rib on its upper face, its internal, cutting edge is toothed 

 and excised at the base. The outer finger is sharply marginate on 

 its external border, inner border toothed and heavily bearded at the 

 base. Carpus armed with a sharp spine and a few minute tubercles 

 within ; beneath them is a sharp median anterior spine, and a minute 

 spiniform tubercle between this and the spine of the internal border. 

 Meros furnished with one or two small sub-apical teeth on the supe- 

 rior border, and two rows of teeth below. Second pair of legs ciliate 

 near the end. Third pair of legs of male hooked. First abdominal 

 appendages of male and annulus of female as in C. Diogenes. 



Length, 76 mm. 



Known localities. Dominion of Canada: Toronto, Prov. Ontario. 

 Michigan : Detroit, East Saginaw (Coll. Peabody Mus. Yale Coll.). 

 Indiana : New Albany. Louisiana : New Orleans (Coll. U. S. Nat. 

 Mus.). North Carolina : Kinston. 



Closely related to C. Diogenes, but at once distinguished by the 

 sharply compressed fingers bearded at the base, excised thumb with 

 a single row of tubercles on external margin, non-angulated anterior 

 border of carapace, etc. The types of this species were dug out of 

 burrows in solid blue clay in Detroit, Mich., by Mr. H. G. Hubbard, 

 in August, 1873. The burrows were three to five feet deep. At the 

 bottom of each burrow was a pocket in a layer of loose gravel and 

 clay, holding water. Just above the water-line an enlargement in the 

 burrow formed a shelf on which the animal rested. 



Specimens from Kinston, N. C, and New Orleans, La., which I 

 have referred to this species, are not adult, and cannot be determined 

 with absolute certainty. 



8. C. Uhleri, sp. nov. 



Male, form I. Rostrum of moderate length, sides nearly parallel 

 to base of acumen, which is broadly triaugular, acute ; no lateral 

 spines ; upper surface of rostrum plane, punctate, lightly foveolate at 

 base, margins raised into a low, sharp crest, punctate-lineate ; there is 



