182 SHELLS OF SAN PEDRO BAY—WILLIAMSON. 
LIST OF SPECIES. 
BRACHIOPODA. 
Family LINGULIDA. 
Genus GLOTTIDIA Dall. 
Glottidia albida Hinds. (Lingula albida, of authors.) 
Found in the drift on the beach. 
Family TEREBRATULID 2. 
Genus TEREBRATELLA Orb. 
Terebratella transversa Sby. 
Seldom found alive. ‘This is the light-colored southern variety; the 
northern ones are much larger and duller. 7, occidentalis is very like 
this, but has the fold in the middle line of the shell convex, while in 
transversa it is concave in the smaller valve.” (W. H. D.) 
MOLLUSCA. 
Family PHOLADID A. 
Genus ZIRPHZA Leach. 
Zirphezea crispata Linn. 
Seldom collected alive; separated valves common. At Bolinas Bay, 
near San Francisco, Mr. W. J. Raymond obtained the Zirphea “by 
digging in soft sandstone with a pick. The burrows are from 12 to 15 
inches or more, in depth, and the shells are very fragile. One has to 
dig a large hole around each specimen before venturing to break into 
the burrow.” 
Genus PHOLADIDEA Turton. 
Pholadidea parva Tryon. 
With P. penita, dead. 
Pholadidea penita Conl. 
A few in the soft rock at Devil’s Gate. 
Genus NETTASTOMELLA Cpr. 
Nettastomella Darwinii Sby. 
A few in soft rocks. 
Genus PARAPHOLAS Conrad. 
Parapholas californica Conr. 
Two or three; with the soft parts gone. 
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