Pacific Shores of North America. 13 



Distance between rostral tips ...... 0.39 " 



" " tips of praeorbital spines . . . 1.30 " 



Length of 1st pair of feet 4.90 " 



" " 2d " " 6.45 " 



" 5th " 4.75 " 



Taken on the coast of California, near San Francisco, by- 

 Lieut. Trowbridge. 

 Mus. Smithsonian. 



'LOXOKHYNCHUS CRISPATUS. StimpSOfl, 71. S. 

 Plate XXII. f. 2, 3, and 4. 



Carapax very much elongated, somewhat triangular ; 

 regions 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 

 the carapax are nearly perpendicular, and provided with 

 tubercles. The whole surface of the body and feet (except- 

 ing the pincers and tips of the tarsi) above and below, is 

 covered with short, thick hair, which, on the front and sides 

 of the carapax and along the angles of the legs, becomes 

 longer, stiff, and curled. The rostrum is but slightly de- 

 flexed, and not curved ; it is slit two thirds of its length, the 

 horns diverging, but slightly turned inwards at their sharp 

 extremities. Prseorbital spines slender, sharply pointed. 

 External antennae long, the fiagella reaching much beyond 

 the tips of the rostrum. The feet are somewhat triangu- 

 larly prismatic ; a character best seen in the third joints. 

 The fourth articles in the posterior four pairs have a longi- 

 tudinal groove on the upper surface. In the first pair the 

 fingers are rather slender, and the posterior tooth of the 

 movable one is much larger than the others ; in this pair 

 of feet there are two small spines on the third joint. The 



