454 Stimpson on the Crustacea and Echinodermata 



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. Praeorbital spines slender, sharply pointed. 

 External antennae long, the flagella 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 

 sternal plastron and abdomen in the male are transversely 

 grooved with deep channels corresponding in number to the 

 articulations. The color beneath the pubescence is bluish- 

 white, the rostrum, spines, and feet being of a bright car- 

 mine hue. 



Length of carapax, $ 3.45 



Greatest width 2.30 



Length of rostrum 0.67 



Distance between tips of prseorbital spines .... 0.82 



" " " anterior spines of branchial region . 1.40 



Length of 1st pair of legs 3.50 



" " 2d " " 4.40 



Found at the island of San Miguel, off the coast of Cal- 

 ifornia, near San Pedro. This is another of the novelties 

 for which we are indebted to that indefatigable observer, 

 Lieut. Trowbridge, who, though devoting his chief atten- 

 tion to the Vertebrata, has succeeded in making collections 

 of the lower forms of animal life, of greater extent and inter- 

 est than has any other student of Californian Zoology. 



Mus. Smithsonian. 



