12:22 CAI.Il't)l{NIA ACADEMY OF SCIKNCES. 



Foiiiul ill tlie lower San Pedro series at Doadman Island and San Pedro, and 

 in the upper Sail Pedro series at Crawfish Georj^e's, San Pedro, and Deadiiian Island. 

 Living. — Monterey to San Pedro (Dall). 

 Pleistocene. — San Pedro (Cooper; Arnold). 



Sectiou Volvarina Hinds. 



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

 extending full length of shell; outer lip tiiin, wilii incurving flange; columella with sharj) plaits. 



203. Marginella (Volvarina) varia Soiverby. 

 I'LATK IV, Fui. 9. 



Volvarina varia Siiv., 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.; hit. 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, Mitra episcopalis Lam. 



204. Mitra maura Swainson. 



Mitra maura Swai^., Proc. Zool. Soc, p. 193, 1835. Cpr., Brit. Assn. Rept., 1863, p. 661. Tryon, 

 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. 



