CALIFORNIA STALK-EYED CRUSTACEA. 43 



Subfamily PERICERIN^. 



Carapace more or less triangular. Rostrum well developed. Second 

 joint of the antenna not dilated. Chelipeds with the fingers acute at the 

 tips. 



Genus Libinia Leach. 



Carapace orbiculate-triangular, convex, spinose. Preocular spine dis- 

 tinct. Rostrum of moderate length and emarginate only at the apex. 

 Eye-peduncles short. Basal antennal joint moderately enlarged, the 

 flagelhim visible from above. Legs of moderate length. Abdomen of 

 male and female seven-jointed. 



Type. L. emarginata LEACH. 



Libinia emarginata Leach. 



Libinia emarginata LEACH, Zool. Misc. (2), 1815, p. 129. RATHBUX R., 



The Fisheries of the U. S., Sec. I, 1884, p. 778, PL CCLXIX, tig. 4. 



RATUBUN M., Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 235, Pi: XXXI, 



fig. 2. OBTMANN, Zool. Jahrb. Abth. f. Syst., Bd. VII, 1894. 

 Libinia canalaculata SAY, Journ. Acad. Nat. Sci. Phila., Vol. I, 1817, 



p. 76. MILNE-EDWARDS, Hist. Nat. Crust., Vol. I, 1834, p. 300. 



STREETS, Proc. Acad. Nat. Sci. Phila., Vol. XXII, 1870, p. 105. 

 Libinia affinis RANDALL, Journ. Acad. Nat. Sci. Phila., Vol. VIII, 1839, p. 



106. STIMPSON, Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 455. 



STREETS, 1. c. 

 For further references, see Rathbun M., I. c. 



Carapace suborbicular, much inflated, and covered with numerous 

 small, pointed tubercles. Median region with four or five median tuber- 

 cles, besides many others. Hepatic regions not distended, and furnished 

 with three quite prominent spines, the upper one forming the first of a 

 series of five spines (or tubercles) which extends backward upon the 

 branchial regions. A row of five tubercles behind the median region, 

 making nine or ten median tubercles in all. Rostrum short, triangular, 

 the apex furnished with a very, small emargination. 



Length of male specimen 95 mm.; breadth 90 mm.; length of cheliped 

 160 mm.; of hand 84 mm.; of first ambulatory leg 158 mm.; of last leg 

 98mm. 



Atlantic Coast from Maine to Florida; ''Western 

 America" (Randall). 



The foregoing description is based on specimens from 

 Wood's Holl, Massachusetts. I have seen no specimens 



