Monks. 
take specific rank. W.H. D.| 
ee doe ye ae ee ot 
206— SHELLS OF SAN PEDRO BAY-—WILLIAMSON. : 
Family FOSSA RIDE. 
Genus ISAPIS Cpr. 
Isapis fenestratus Cpr. 
Rare; rock pools. Also fossil in San Pedro City. (J. G. C.) 
Family RISSOID 24. 
Genus RISSOA Freminville. 
Rissoa (Alvania) reticulata Cpr. 
One example. (C. 7.8.) Rissoina purpurea of Cooper. 
Family TRUNCATELLID A. 
Genus TRUNCATELLA Risso. 
Truncatella californica Ptr. 
On sea weed, not many found. (C. T. 8.) 
Truncatella Stimpsoni Stearns. 
One. (C.T. 8.) 
Family JEFFREYSIID_. 
Genus JEFFRBYSIA Alder. 
Jeffreysia sp. 
One worn specimen found near Dead Man’s Island. (W. H. D.) 
Jeffreysia translucens Cpr. 
Three or four. (C. T. 58.) 
Family OVULID A. 
Genus OVULA Bruguiére. 
Ovula (Simnia) deflexa Sby. var. barbarense Dall. Pl. xx1, fig. 1. 
One example, one inch in length, found in San Pedro Bay, by Miss 
[O. deflexa is a southern form, but was reported by Col. Jewett from 
Santa Barbara. His specimen was probably the same as the form here 
figured, which is of a whitish color and does not seem to agree per- 
fectly with Sowerby’s figures. I therefore separate it varietally until 
more is known. If it prove distinct from deflexa the varietal name may 
