of the Pacific Shores of North America. 453 
thick villosity. Those of the first pair shorter than those of 
the second, with fingers touching each other along the whole 
length of their denticulated inner edges; wrist somewhat 
tuberculous above; third article with four small distant 
spines on the superior margin, the largest being at the sum- 
mit of the abrupt expansion at the articulation of the fourth 
article. A single subterminal spine on the third article of 
the second pair of feet; this spine becomes almost obsolete 
in the posterior pairs, which are elsewhere smooth. Tarsi 
short and thick, somewhat curved, with corneous tips easily 
separable in dry specimens. The color of exposed parts is 
reddish inclining to roseate, becoming yellowish-white on 
the sides. Fingers white. The following are the dimen- 
sions of a female :— 
Length of carapax i : : : : ats 5.55 inch. 
ne OE PASS I IQ ch PP MUT 
Length of rostrum from base of præorbital spine .  . 0.96 “ 
Distance between rostral tips. ere a x 0: NE S 
* — tips of przorbital spines M Fo gus 
Length of 1st pair of feet . . —. . . . we" 
&« [11 9d « [11 x j a * Á 6. 45 & 
« [1 5th *' e 4 : 2 : ; : 445 * 
Taken on the coast of California, near San Francisco, by 
eut. TROWBRIDGE. 
Mus. Smithsonian. 
LOXORHYNCHUS CRISPATUS. Stimpson, n. s. 
Plate XXII. f. 2, 3, and 4. 
Carapax very much elongated, somewhat triangular ; 
Tegions separated by deep depressions. There are nine 
large tubercles above, with sharp apices, between which 
smaller ones are interspersed. ‘These tubercles are as fol- 
lows : one at the posterior summit of the stomachal region, 
one at each hepatic region, (projecting laterally,) two on 
each side at the branchial regions, and one at either extrem- 
ity of the abruptly convex intestinal region. The sides of 
