1921 1 Schmitt: The Marine Decapod Crustacea of California 139 



ten specimens were taken, the greatest number obtained at any one 

 station. Otherwise the average number of specimens per haul (middle 

 bay only) was one and eight-tenths. Less than one-third (four) of 

 the stations were made on more or less hard bottom, sandy, rocky or 

 both ; two hauls were made through the eel grass patches around Angel 

 Island (D 5763, 5764), while seven were either wholly or at least 

 predominantly muddy bottom. 



In addition a number of specimens were collected along the rocky 

 shores of the middle bay: two at Point Bonita; six at Sausalito on 

 different occasions; twenty-two at Red Eock, and twenty-five at Rich- 

 mond, north of the Standard Oil Pier. 



The extremes of the correlated temperatures and salinities observed 

 for this species are, respectively, 10.8° to 14.2° C and 17.5 to 31.7. 

 That Pagurus hirsutiusculus was not dredged outside is probably due 

 to the combined effect of depth and character of bottom rather than to 

 temperature or salinity, in view of its wide geographic distribution as 

 cited above. 



As most of our survey specimens were found inhabiting the shells 

 of Thais lamellosa and Nassa mendica, it would be interesting to com- 

 pare their distribution with that of Pagurus hirsutiusculus although 

 it should be remembered that hermit crabs sometimes transport shells 

 for considerable distances (Sumner, 1911, p. 153). With the appear- 

 ance of Packard's Molluscan Fauna from San Francisco Bay (1918, 

 pp. 332, 336), I find that the distribution of Pagurus hirsutiusculus 

 coincides with the former at eight stations (D 5708, 5723, 5753, 5755, 

 5773, 5779, 5781, 5826) and the latter at four (D 5705, 5755, 5773, 

 5779). Pagurus hirsutiusculus was also found at three stations from 

 which Packard (1918, p. 332) records Nassa fossata (D 5744, 5763?, 

 5764?). 



Pagurus samuelis (Stimpson) 



Plate 16, figures 2 and 3 



Eupagurus samuelis Stimpson, Proc. Boston Soc. Nat. Hist., 6, 86, 1857; 



Ann. Lye. Nat. Hist. N. Y., 7, 90, pi. 1, fig. 8, 1859 (1862) ; Ortrhann, 



Zool. Jahrb., Abt. f. Syst, 6, 301, pi. 12, fig. 12, 1892. Pagurus samuelis, 



Holmes, Oecas. Papers Calif. Aead. Sei., 7, 144, 1900 ; Eathbun, H. A. E., 



10, 160, pi. 5, fig. 7, 1904; Hilton, Jour. Ent. Zool., Pomona Coll., 8, 



63, 1916. 



Characters. — Anterior portion of carapace longer than wide; median projection 



of front triangular, acute. Eye-stalks only moderately stout. Acicle never 



exceeding eye-stalk. Carpus of large cheliped not deeper than wide, inner and 



lower faces not meeting at a distinct angle. Small hand wider than deep; outer 



