1921] Schmitt: The Marine Decapod Crustacea of California 1389 
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 Rock, 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 Fawna 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, 57632, 
57642). 
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, pl. 1, fig. 8, 1859 (1862) ; Ortmann, 
Zool. Jahrb., Abt. f. Syst., 6, 301, pl. 12, fig. 12, 1892. Pagurus samuelis, 
Holmes, Oceas. Papers Calif. Acad. Sci., 7, 144, 1900; Rathbun, H. A. E., 
10, 160, pl. 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 
