396 MEMOIRS OF THE CARNEGIE MUSEUM 
quent are a proximal tubercle on the inner margin, and one between the two larger 
spines first mentioned, and another just behind the base of the large spine of the 
inner margin. 
Meropodite smooth, with 1-3 indistinct tubercles near the distal end of the upper 
margin, often entirely obsolete. Lower side with two rows of spiniform tubercles. 
The outer row consists of 2-6 (if only 2, they are followed by a few undulations 
produced by punctures); the inner consists of 6-11 tubercles. Outer articular tuber- 
cle with carpopodite without spine. Al] spines of the first pereiopods are indistinct 
in very young specimens. 
Ischiopodite of third pereiopod hooked in the male. Hook of the male of the 
first form strong, subconical. 
Coxopodite of fourth pereiopod in the male with a prominent, blunt, and slightly 
compressed subconical tubercle. 
First pleopods of the male (Plate XX XIX, Fig. 9) similar to those of C. barton. 
Annulus ventralis of the female likewise of the type of C. barton, but less trans- 
verse, and the posterior margin more swollen and elevated, while the anterior is 
hardly elevated at all, but depressed. 
Size. — The largest male of the first form at hand is from Dunbar, Fayette 
County, and measures 67 mm. in length. The largest female is from Ohiopyle, 
Fayette County, and measures 80 mm. in length. 
Color (Plate A, Fig. 4).— Whole body rather uniformly orange-chrome (Ridgway, 
1886, VII, 13) to chinese-orange (VII, 15), very brilliant in fresh shells, shading to 
orange-rufous (VII, 12) and cream-color (VI, 20) on the sides. Color most intense 
on anterior part of carapace and on the claws. Abdomen orange-chrome, shading to 
salmon-color (VII, 17) or ferrwgineous (1V, 10), or ochraceous-buff (V, 13). Chelee 
varying from orange-chrome to saturn-red (VII, 16). Legs chinese-orange to salmon- 
color and ferrugineous. Often a brown or blackish coat of mud covers a great part » 
of the body, obscuring the colors. The color of young specimens is semitransparent, 
with more or less red prevailing, but the rostrum and chele are always distinetly 
red. Color of eggs salmon (VII, 17) to salmon-buff (IV, 19). 
There are one hundred and thirty-eight specimens in the Carnegie Museum ; 
ninety-three from Pennsylvania, thirty-six from West Virginia, and nine from 
Maryland. 
DISTRIBUTION. 
LOCALITIES REPRESENTED IN THE CARNEGIE MUSEUM. 
PENNSYLVANIA: Westmoreland County, Jones Mills; Fayette Cownty, Dunbar ; In- 
dian Creek; Rainier Park, Ohiopyle; Somerset Cownty, Windber; Listie; Rock- 
wood; Myersdale. 
