212 SHELLS OF SAN PEDRO BAY—WILLIAMSON. fa | 
Family MARGINELLID4. 
Genus MARGINELLA Lam. 
Marginella Jewettii Cpr. Pl. x1Xx, fig. 6. 
San Pedro, Jewett in U. S. Nat. Museum. 
Marginella pyriformis Cpr. Pl. xx, fig. 5. 
One or two. (C. T. 8.) 
Marginella regularis Cpr. 
One empty shell. (C. T. 8.) 
Section VOLVARINA Hinds. 
Marginella (Volvarina) varia Sby. 
Under stones; rare. Common at Catalina. 
Family OLIVID4. 
Genus OLIVELLA Swainson. 
Olivella biplicata Sby. 
In the sand near Dead Man’s Island. Dead shells not uncommon in 
the bay. 
Olivella biplicata var. alba. 
Seldom found. 
Olivella biplicata var. brunnea. 
This brown variety is rare, and not found living. Dr. Cooper says 0. 
biplicata “varies in color from black through brown, purple, gray and 
pink to white.” 
Olivella intorta Cpr. Pl. xix, fig. 9. 
Santa Cruz to Lower California, U.S. Nat. Museuin. 
Olivella betica Cpr. Pl. x1x, fig. 7. 
In the sand in both bays, although not plentiful. 
Family NASSID4. 
Genus NASSA Lam. 
Nassa fossata Gld. 
Adults seldom collected. 
Nassa insculpta Cpr. Pl. xxm1, fig. 6. 
Three; Catalina Island. (J. G. C.) Not uncommon at 16 fathoms 
depth. Fossil in Pleistocene, 
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