26 CALIFORNIA ACADEMY OP SCIENCES. 



Closely allied to P. Richii. Carapace lyraie to broadly ovate, convex, 

 tuberculated, the tips of the tubercles often furnished, as in the preced- 

 ing species, with tufts of setse. The number and position of the tuber- 

 cles are the same as in Richii except that there may be a few small 

 tubercles, or tufts of setre on the branchial regions. The cardiac tubercle 

 may become scarcely visible in old specimens. Median region tumid, the 

 middle anterior tubercle small, and sometimes obsolete. Curved setse as 

 in Richii. Rostrum less prominent than in the preceding species; supra- 

 orbital tooth broader than in Richii, separated by an incision from the 

 postorbital tooth which is triangular, acute and points more nearly for- 

 wards than it does in the preceding species. Behind the postorbital is a 

 broadly triangular tooth, the posterior margin of which is nearly longitu- 

 dinal. Postero-lateral tubercle smaller than in Richii. Ischium of the 

 maxillipeds with a longitudinal groove; exoguath also grooved. Spine 

 on sub-branchial regions small or wanting. Merus of the chelipeds with 

 a prominent irregularly dentate cariiia on the upper side; carpus cristate. 

 Legs subcylindrical, the merus and propodus more or less carinated above, 

 especially in the anterior pairs. 



Length 28 mm.; width between antero-lateral horns 16.25 mm.; between 

 postero -lateral horns 20.5 mm. 



Alaska! Vancouver Island, Puget Sound, Oregon, 

 northern California! Farallon Islands! southern Cali- 

 fornia. Found at low tide. 



This species may easily be distinguished from Richii 

 by the lyrate form of the carapace, the form of the large 

 tooth behind the postorbital, by the crest on the merus 

 of the chelipeds and the subcarinate joints of the ambu- 

 latory legs. 



Pugettia Dalli Rath. 



Pugettia Dalli RATHBUN M., Proc. U. S. Nat. Mus., Vol. XVI, 1893, p. 232. 



A small species closely allied to P. Richii, the young of which it closely 

 resembles. Carapace subtriangular, tuberculated; the tubercles on the 

 gastric region are disposed as in the preceding species, but the anterior 

 and posterior tubercles are small or obsolescent; there is a tubercle on the 

 intestinal region and a prominent one on the cardiac; a small tubercle on 

 the branchial region in the position of the posterior one in the other 

 species. Rostrum much resembling that of Richii, but with slightly more 

 slender horns. Supraorbital tooth acute; postorbital flattened and point- 

 ing obliquely downwards; the tooth behind the postorbital is more slender 



