34 



laminae, about one third of a mm apart, forming a chalky cover- 

 ing to the shell; entire surface of shell is further marked by fine, 

 but somewhat irregular radiating lines and corresponding depres- 

 sions a little less than 2 mm apart; these lines are more aisimc.ly 

 shown on anterior portion of shell; margins finely crenulated; 

 young shells are of a dirty yellowish white, and mature shells 

 which have become divested of the chalky exterior are of a yel- 

 lowish brown color, and together with the young shells are 

 marked with 4 radiating rows of chocolate colored blotches. Size 

 of largest shell in writer's collection 2 3-8th inch long, same 

 height, and 2 inches in width."— Yates, Santa Barbara soc. nat. 

 hist, bulletin 1:46 tl f 1-5. 



Dedicated to H. C. Ford, for many years president of the 

 Santa Barbara society. 



Type locality: — Santa Barbara channel, Cal. 



Considered a synonym of Venus toreuma by some concholo- 

 gists. 



352 Lingula albida Hinds 



Monterey, Cal., to Baja Cal. Santa Barbara in 28 fathoms. 

 Synonym of Glottidia albida. 



353 Xylotrya setacea Tyron 

 Synonym of X. pinnatifera Blainville. 



354 Pholadidea penita Conrad 

 Synonym of Penitella penita. 



355 Pholadidea ovoidea Gould 

 Synonym of Penitella ovoidea. 



356 Saxicava pholatlis Linnaeus 



In every sea? Straits of Fuca to Santa Barbara, Cal.; Alaska. 



357 Glycimeris generosa Gould 



Asia; Alaska; Budd's Inlet, Washington; San Pedro, Cal. 

 Santa Rosa Island. 



358 Cyathodonta undulata Conrad 

 Santa Barbara, Cal., to Gulf of Cal. 



359 Neaera pectinata Carpenter 



Vancouver Island to Catalina Island, Cal., 20-120 fathoms. 



Nearly globular, about 12 prominent ribs; posterior end of 

 shell drawn out into a small tube, so that each valve looks like 

 a small dipper; 6 mm long. 



360 Entodesma saxicola Baird 



Vancouver Island to Monterey, Cal.; Santa Rosa Island 

 (Yates). 



Shell oblong or pear-shaped, bulging at hinge end, gaping be- 

 neath, and prolonged around the siphons into an irregular process 

 consisting chiefly of epidermis; shell white inside. 



361 Mytilimeria nuttalli Conrad 



Vancouver Island to San Diego, Cal. Santa Rosa Island 

 (Yates). 



Shell very thin, white, an inch in diameter; generally found 

 imbedded in masses of Ascidians, which form a protection to the 

 delicate shell. 



