222 CALIFOllNIA ACADEMY OF SCIENCES. 



Fouud in the lower San Pedro series at Deadraan Island and San Pedro, and 

 iu the upper San Pedro series at Crawfish George's, San Pedro, and Deadman Island. 

 Living. — Monterey to San Pedro (Dall). 

 Pleistocene. — San Pedro (Cooper; Arnold). 



Section Volvarina Hinds. 



Shell small, pyriform, polished; spire elevated, but concealed by enamel; aperture not 

 extending full length of shell; outer lip thin, with incurving flange; columella with sharp plaits. 



203. Marginalia (Volvarina) varia Sowerby. 



Plate IV, Fuj. 9. 



Volvarina varia Sby. , Cpr. , Brit. Assn. Rept., 1863, p. 661. Keep, West Coast Shells, p. 43, 1892. 



Shell small, pyriform, smooth; spire elevated slightly, but concealed by enamel of surface; 

 aperture not extending full length of body- whorl, narrow posteriorly, widening gradually anteriorly; 

 outer lip thin, with a flange curved inward; columella with four sharp plaits. 



Dimensions. — Long. 9 mm.; lat. 5 mm.; aperture 8 mm. 



Specimens identified by Dr. Dall. 



Found in all of the lower and upper San Pedro series localities in the vicinity 

 of San Pedro. Found also in the Pleistocene at Twenty-sixth Street, San Diego. 

 The specimen figured is from the lower San Pedro series at Deadman Island, and is 

 now in the collection of Delos Arnold. 



Living. — Santa Barbara to San Diego (Cooper): Cape St. Lucas; West Indies 

 (Carpenter). 



Pleistocene. — San Pedro; San Diego (Arnold). 



Family LVI. MITRID.E. 



Genus Mitra Lamarck. 



Shell fusiform, thick; spire elevated; aperture small, narrow, notched in front; columella 

 transversely, somewhat obliquely, plicate; outer lip thick, smooth within, without external varices. 



Type, Ultra episcopalis Lam. 



204. Mitra maura Swainson. 



Mitra niauraSvjhi^., Proc. Zool. Soc, p. 193, 1835. Cpr., Brit. Assn. Rept., 1S63, p. 661. Trvon, 

 Man. Conch., Vol. IV, p. 121, PI. XXXVI, fig. 67, 1882. Cooper, 7th Ann. Rept. 

 Cal. St. Min., 1888, p. 257. Keep, West Coast Shells, p. 42, fig. 22, 1892. William- 

 son, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 211. 



Shell mitre-shaped; spire elevated; apex subacute; whorls five or six, only slightly convex, 

 each appressed against antecedent whorl, forming a distinct suture; surface smooth, except for 

 incremental lines; aperture long, narrow; outer lip thickened; inner lip not incrusted; columella 

 with four distinct plaits, which increase in prominence posteriorly. 



Dimensions. — Long. 56 mm.; lat. 18.5 mm.; body-whorl 37 mm.; aperture 25 mm.; defl. 

 30 degrees. 



