118 CALIFORNIA ACADEMY OF SCIENCES. 



(Edignathus Brandti (Schalfeew). 



Hapalogaster Brandti SCHALFEEW, Melang. biol., Tome XIII, 1892, p. 330, 

 figs. 1 and 5b, du Bull. Acad. imp. sci. St. Petersb., Tome XXXV, 1892, 

 p. 336. 



(Edignathus Gllli BENEDICT, Proc. U. S. Nat. Mus., Vol. XVII, 1894, p. 487. 



Dermalurus Gilli BOUVIER, Ann. Sci. nat. (8), Tome I, 1896, p. 19. 



Carapace lyrate, convex above, and covered with flat scale-like plates 

 which are setose on the anterior margin. Eostrum short, triaugiilar, acute 

 and curved downwards. Outer orbital angle snbacute, the inner orbital 

 tooth represented by a minute prominence. Upper surface of the antennal 

 acicle furnished with minute spines; lower surface smooth. Chelipeds 

 very unequal and covered with low, granulated, wart-like tubercles; in 

 the larger cheliped the anterior margin of the merus is produced and cut 

 into three or four teeth; the anterior margin of the carpus is furnished 

 with a jagged tooth near the base; the hand is large and swollen, the fin- 

 gers are somewhat gaping at the base, the tips excavated within. In the 

 smaller cheliped the process on the anterior side of the merus is gener- 

 ally cut into two small teeth; a tooth on the anterior margin of the car- 

 pus; the hand is narrower and less tumid than in the large cheliped; the 

 fingers are deeply excavated within and meet along the entire inner margin; 

 outer margin corneous like the tip and armed with a few small teeth. 

 Ambulatory legs more or less hairy; a group of small spines on the infero- 

 distal angle of the propodi; dactyls ending in black, curved, acute tips 

 and armed below with five or six black spines. Abdomen covered with a 

 short pubescence; the margins fringed with long hairs; the calcareous 

 plates on the last two segments inconspicuous. Four two-jointed, uni- 

 ramous appendages on the left side of the abdomen in the female. The 

 margin of the left side of the abdomen in the female is hardened and seg- 

 mentally incised, but this is not the case in the male. 



Length of carapace from tip of the rostrum to the posterior emargina- 

 tion, 15.5 mm.; breadth, 15.5 mm.; length of large cheliped, 40 mm.; 

 length of small cheliped, 28 mm. 



Alaska (Benedict)! British Columbia! Hurnboldt 

 County, Calif., to San Francisco Bay! 



This species is often found on the rocks among the 

 mussels. It may be easily recognized by its lyrate 

 carapace covered by the very peculiar scale-like plates 

 and the very unequal chelipeds with their wart-like 

 tubercles. 



Through the kindness of Mr. Benedict I have exam- 

 ined the types of his Gilli (No. 18525, U. S. Nat. Mus.). 



