1918] Packard: Molluscan Fauna from San Francisco Bay 271 
pholadid borings. These few are not considered separately in this 
report. 
The distribution chart (plate 45) shows that this species is re- 
stricted to the middle and lower division of the bay. Living specimens 
were dredged at twelve stations in 114 to 10 fathoms, and shells were 
obtained at a number of other stations including several shore stations. 
Range.—Typieal form: Crescent City, California, to Socorro Island 
(Dall). Ineluding varieties, Aleutian Islands to Socorro Islands 
(Dall). 
Paphia staminea (Conrad) var. ruderata (Deshayes) 
Chione ruderata Deshayes (1853), p. 136. 
Venus staminea, var. ruderata, Wood and Raymond (1891), p. 55. 
Paphia staminea, var. ruderata, Dall (1902a), p. 398. 
Description.—Dall (1902a) described this variety as follows: 
‘*This form, which is found chiefly in the north, is characterized by the 
turgidity and prominence of the concentric sculpture, which becomes more 
conspicuous than the radial ribs. Occasionally the shells are delicate and 
elegant, but usually specimens of this variety are rude and irregular, coarse 
and unattractive.’’ 
This variety is a northern form occasionally occurring as far south 
as San Francisco. Although it was listed from this region by Wood 
and Raymond (1891) it has not been recognized in the Survey collec- 
tions. 
Range.—Bering Sea to Lobitas, California (Dall). 
Paphia staminea (Conrad) var. orbella (Carpenter) 
Plate 19, figure 6 
Paphia staminea var. orbella Carpenter, Dall (1902a), p. 398. 
Description—Dall (1902a) characterizes this species as follows: 
‘<This variety comprised those specimens which have nestled in the borings 
of large Pholads of the coast, ...and have been obliged to grow into an 
abnormal swollen and tumid shape. They are usually chalky and of a gray 
tint.’’ 
A number of specimens of Paphia staminea were found as nestlers 
in borings of pholads, some of these might easily be considered as 
belonging to this variety, yet for the purposes of this report they have 
not been listed separately. 
Range.—Kodiak Island, Alaska to San Diego, California (Dall). 
