GRAPSOIDEA. 335 



acute. Anterior feet smooth, hand naked externally, below obso- 

 letely uni-costate or hardly so, surface within having a lanose spot, 

 carpus smooth ; fingers of male gaping and touching only at tips. 

 Posterior feet somewhat hirsute at the margins, especially of fourth 

 and fifth joints. 



Plate 20, fig. 6 a, animal, natural size ; b, hand, in outline. 



Puget's Sound. — Lieut. Case. 



Length of carapax, ten lines ; breadth, eleven and a half lines. 



P. oregonensis, Dana, Proc. Acad. Nat. Sci. Philad., 1851, v. 248. 



PSEUDOGRAPSUS NUDUS. 



Carapax obsolete areolatus, regione mediand vix circumscripta, cum lined 

 elevatd non intersectd, areola intramediand (3 M) non circumscripta, 

 fronte paido arcuato, margine antero-laterali bi-emarginato. Pedes 

 toti nudi; antici mqui, manu extus nudd, Iwvi, infra levissimd uni- 

 costatd, intus partim lanosd, carpo Iwvi; 8 postici paido lati, tarso 

 sulcato. 



Carapax obsoletely areolate, median region hardly circumscribed, not 

 crossed by a raised line, areolet 3M (intramedian), not circum- 

 scribed ; front slightly arcuate, antero-lateral margin bi-emarginate. 

 Feet all naked ; anterior equal, hand naked and smooth without, 

 faintly uni-costate towards lower part, within over a spot lanose, 

 carpus smooth; eight posterior feet compressed, tarsus sulcate, com- 

 pressed. 



Plate 20, fig. 7a, male, natural size; b, under view; c, hand, natu- 

 ral size. 



Puget's Sound and San Francisco. — C. Pickering. 



Length of carapax of a female, ten and a half lines; greatest 

 breadth, twelve and a half lines; ratio, 1:1-19; length of a male, 



