AKNOLD — THE PALEONTOLOGY AND STRATIGKAPHY OF SAN PEDKO. 229 



specimen figured was from the Pliocene, Deadman Island, and is now in the collec- 

 tion of Delos Arnold. 



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



Pleistocene.— &iin Pedro; Santa Barbara; Ventura (Arnold). 



Pliocene. — Eagle Prairie; Twelve Mile House; San Fernando; Santa Barbara 

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



214. Chrysodomus, sp. indet. 



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

 whoi'ls, the other slightly tabulated on upper part; fine spiral sculpture on both. 

 These specimens have the shape of C. dims. They correspond quite closely to the 

 descriptions of some of tlie living species which now inhabit boreal waters. 



Found in the Pliocene of Deadman Island. 



Pliocene. — San Pedro (Arnold). 



Genus Siphonalia A. Adams. 



Shell ovately fusiform, sometimes variegated 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. 



Plate IV, Fig. 5. 



Siphonalia kellettii ¥o^hKS, Proc. Zool. Sec, 1850, p. 274, Pi. X, fig. 10. Cpr., Brit. Assn. Rept., 

 1863, p. 663. Tryon, Man. Conch., Vol. Ill, p. 134, PL 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, 1S92. 



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. 



Dimensions. — Long. 114 mm.; lat. 59 mm.; body-whorl 80 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 San Pedro, and is now in 

 the private collection of Delos Arnold. 



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



