— 26 — 



From their fragile condition it was impossible to preserve entire 

 specimens, though the shells were from one eighth to one sixth inch 

 thick, long soaking by rain water having softened them. 



All differ from "P. pedroana " as figured, in the absence of concentric 

 ridges and radiating lines. Although called "recent" by Blake and 

 Conrad, this is certainly an extinct species, and from those associated 

 with it seems Pliocene, or at least Quaternary. 



Fusus ambustus Gould. 



Proc. Best. Soc. Nat. Hist., 1851, in part, Mexican and Californian 

 Shells, p. 12, pi. 14, f. 18. 



Living — Southern California? Mazatlan. 



PL — Dead Man's Island, San Pedro Bay (Mrs. Williamson). Ventura 

 County (Bowers). 



Fusus corpulentus Conrad. 



U. S. Expl. Exp., Geology, p. 728, pi. 20, f. 4. Amer. Jour, of 



Conch., 1865, p. 150. Dall, Proc. U. S. Nat. Mus., vol. XIV, 1891, 



p. 179. 



Mioc. — Astoria, Oregon. Dead Man's Island. San Pedro Bay, Cal. 

 (Miss Monks and Mrs. M. B. Williamson). 



PliocJ — Mr. Dall calls this island Miocene, but the proportions of 

 living species found there do not indicate older strata than Pliocene. 

 The upper layers seem to be Quaternary. 



Mr. Gabb also considered the lower beds Miocene, but many more 

 species have been collected since he was there. 



Fusus dupetithouarsi Kiener. 



Coq. Vivants, No. 11, p. 15, pi. 11 (date?). 



Living — Cape St. Lucas and West Mexico. 



Quai. — Santa Barbara to Dead Man's I., San Pedro Bay (S. Bowers). 

 Specimens obtained by Whitney's Geological Survey were referred to 

 this species, but were too imperfect for certainty. Dr. Bowers' better 

 ones, compared with recent Mexican shells, show no difference. 



Gadinia reticulata Sowerby? (var. radiata, J. G. Cooper). 



Proc. Zool. Soc. of Lond., 1835, p. 6, Mouretia. Carp., Shells of 



West N. America, p. 152, 651. Gabb., Proc. Cal. Acad. Sc. 3, p. 188. 



(Rowellia radiata J. G. Cooper.) Dall, Amer. Jour. Conch., VII, 

 1870, pi. 2 and 4. Keep, West Coast Shells, p. 98, f. 83. 



Living — Farallon I. to San Diego. Mexico. 



Quat. — San Nicolas I. (S. Bowers.) 



