138 CALIFORNIA ACADEMY OF SCIENCES. 



Pagurus trigonocheirus (St.) 



Eupagurus trigonocheirus STIMPSON, Proc. Acad. Nat. Sci. Phila., 1858, 

 pp.237 and 249. MDRDOCH, Rep. Int. Polar Expd. to Pt. Barrow, Part 

 IV, 1885, p. 138, Plate I, figs. 1, la and 16. BENEDICT, Proc. U. 8. Nat. 

 Mus., Vol. XV, 1892, p. 1. 



The three prominences of the front are subequal, the lateral ones end- 

 ing in a minute spine. The anterior portion of the carapace is longer 

 than wide and more or less pubescent; a tuft of hairs on the median pro- 

 jection of the front. Eye-stalks rather stout and much shorter than the 

 width of the carapace. Eye-scales subovate, acute, more or less pubes- 

 cent and not at all channeled above. Acicle rounded, pubescent, and 

 reaching the tip of the ocular peduncle. Chelipeds pubescent; right cheli- 

 ped with the ischium denticulated on the lower margin; merus trigonal, 

 supero-lateral surface much rounded and scabrous; lower surface spinu- 

 lous; the supero-distal margin spiny; carpus thick, oblong, the upper 

 surface convex and covered with short spines; inner and outer surfaces 

 flattened and less strongly spiuose; hand oblong, slightly narrower thaii 

 the distal end of the carpus; the upper surface convex and covered with 

 short spines; inner margin obtuse; outer margin subacute, except near the 

 base, and spinulous; lower surface spinulous near the margins; fingers 

 shorter than the palm; dactyl narrower than the pollex, with a spinulous, 

 subacute outer margin and a longitudinal row of short spinules on the 

 upper surface. Smaller cheliped reaching beyond the carpus of the larger 

 one; merus compressed, spinulous below; carpus compressed, distally 

 widened, especially on the lower side, the upper margin spinulous; hand 

 trigonous, the supero-lateral face wide, flattened, subspinulous or granu- 

 lar, the edges acute; the upper edge is the longer, with the posterior por- 

 tion convex and spinulous, the spinules becoming smaller on the pollex; 

 dactyl narrow and nearly smooth. Ambulatory legs scabrous or spinulous 

 on the margins; the two small posterior pairs are smooth and strongly 

 pubescent. 



Length, 3 inches. 



Arctic Ocean and Behring Sea (Stimpson); Alaska! 

 Pagurus capillatus (Benedict). 



Eupagurus capillatus BENEDICT, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 8. 



Anterior portion of the carapace a little longer than wide. Median 

 frontal lobe broadly rounded. Ocular peduncles more than two-thirds as 

 long as the anterior portion of the carapace, and slender. Acicle not 

 reaching to the tip of the eye. Hand of larger cheliped twice as long as 



