272 



PROCEEDINGS OF THE ISTATION.^L MUSEUM 



VOL. 85 



KEY TO THE SUBSPECIES OF CHONDROTHYRETES SHUTTLEWORTHI 



Axial sculpture of last whorl less strong than spiral. 

 Greater diameter more than 16 mm. 



Inner peristome greatly expanded and thickened cumbrensis 



Inner peristome not greatly expanded and thickened. 



Decollated shell with 3.5 whorls shuttleworthi 



Decollated shell with 4.5 whorls portica 



Greater diameter less than 15 mm. 



Back of outer peristome broadly raj-ed atriola 



Buck of outer peristome not broadly rayed mameyensis 



Axial sculpture of last whorl as strong as spiral. 

 Whorls gibbo.se. 



Greater diameter more than 15 mm clivicola 



Greater diameter less than 15 mm catalinensis 



Whorls not gibbose perplexa 



FiGDRE 89. — Distribution of the sub.specics of Chondrothyretes shuttJetcorthi: (1) cuin- 

 brensis; (2) clivicola; (3) catalinensis; (4) shuttletcorthij (5) perplexa; (6) portica; 

 (7) atriola; (8) mameyensis. 



CHONDROTHYRETES SHUTTLEWORTHI CUMBRENSIS. new subspecies 



Plate 19, Figuke 5 



Shell similar in size and shape to O. shuttleioorthi slmffleirorth'i^ 

 but with tlie iinier peristome broadly expanded, much thickened, 

 and reflected over half of the outer. 



The type series of specimens were collected by John B. Henderson 

 in the Sierra la Cumbre north of San Diego Banos, east of the Rio 



