ARNOLD — THE PALEONTOLOGY AND STKATIGEAPHY OF SAN PEDRO. 229 



specimen lii;iiie(l was Iroiii the riiocciie, Deadinaii Islaiul, and is now in liie cdUgc- 

 tiiin (if Dt'los Aninlii. 



Living. — Straits of Fuca to Catalina Island (Cooper). 



Pleistocene. — San Pedro; Santa Barbara; Ventura (Arnold). 



Pliocene. — Eagle Prairie; Twelve Mile House; San I'Vinando; Santa Barbara 

 (Cooper); San Pedro (Cooper; Arnold). 



214. Chrysodomus, sp. indel. 



Two poorly preserved, nndelcrminablo species; both fusiform, one with rounded 

 wliorls, the otlicr slightly tabulated on upi)er part; fine spiral sculpture on both, 

 'i'hese specimens have the shape of C. dims. They correspond quite closely to the 

 <lescrij)tions of some of the living species which now inhabit boreal waters. 



Found in the Pliocene of Deadman Islaiul. 



Pliocene. — San Pedro (Ai'nold). 



Genus Siphonalia ^4. Adams. 



Shell ovately fusiform, sometimes variej^ated in coloring; rather thin; epidermis very thin, 

 fugacious; last whorl ventricose, shouldered, usually nodosely plicate and spirally ribbed; aperture 

 oval: outer lip thin; columella smooth; canal rather short, twisted. 



Siphonalia nodosa Mart, is a characteristic species. 



215. Siphonalia kellettii Forbes. 



ri.ATK. IV, Fig. 5. 



Sipho7ialia kellettii Yov.v.^s, Proc. Zool. See, 1850, p. 274, PI. X, fig. 10. Cpr., Brit. Assn. Rept., 

 1863, p. 663. Tryon, Man. Conch., Vol. Ill, p. 134, PI. LIV, fig. 352. Cooper, 7th 

 Ann. Rept. Cal. St. Min., 1888, p. 264. Dall, Trans. Wagner Inst. Sci., Vol. Ill, 

 Part. I, 1890, p. 122. Keep, West Coast Shells, p. 22, 1892. 



Shell large, fusiform; spire elevated; apex subacute; whorls seven or eight, angulated 

 anterior to middle with eight to ten prominent nodes on angle; concave near posterior margin, 

 where it is appressed against the antecedent whorl; numerous fine, deep grooves furnish the spiral 

 ornamentation; suture appressed, wavy; aperture ovate; outer lip not thickened; inner lip incrusted; 

 columella twisted; umbilicus subperforate ; canal long, narrow, curved back. 



/ )imeiisio?is. —l.ong. 114 mm.; lat. 59 mm.; body-whorl So mm.; aperture 37 mm.; canal 

 22 mm.; defl. 44 degrees. 



Often brought up alive in the nets of fishermen at San Pedro, but rarely found 

 fossil. Found in the upper San Pedro series at San Pedro, Los Cerritos, and Crawfish 

 George's. Found also in the Pleistocene at Pacific Beach, San Diego. The speci- 

 men figured was obtained in the upper San Pedro series at Sau Pedro, and is now in 

 the private collection of Delos Arnold. 



Living. — Santa Barbara to San Diego; Japan (Cooper). 



