444 MAZATLAN UNIVALVES 



specimens, by the state of the mouth, indicate maturity ; por- 

 tions were found of a very few others. Long. (anfr. nucl. 

 decol.) '073, long. spir. '05, lat. '032, div. 30. 

 Sab. Mazatlan ; extremely rare, off Spondylus ; L'pool Col. 

 Tablet 2031 contains 2 sp. one with complete mouth, the 

 other with complete apex ; also an adult labral fragment, which 

 may belong to this species. 



560. CEEITHIOPSIS SOEEX, n. s. 



C. t. " C. pupiformi" simili, sed multo minore, tumidiore, gib- 

 bosd ; tnarginibus spires maxime excurvatis ; anfr. vii. quarum 

 dimidium nucleosum est, maxime prommens, lave; anfr. normali- 

 bus subito tumentibus, planatis, suturd vix impressd ; carinis 

 tumentibus iv., iii. in spird maxime tuberculosis, und ad peri- 

 pheriam subtuberculosd, striis in basi pluribus ; labro contracto, 

 labio conspicuo ; albidd, purpureo-fuscdfasciatd. 



This remarkable shell looks like a fat Shrew with a promin- 

 ent snout. It is quite adult, but it probably varies in colour 

 and compactness. Long. '063, long. spir. '043, long. nucl. '01, 

 lat. *027, lat. nucl. '007, div. maxime variante. 

 Hab. Mazatlan ; 4 sp. off Spondylus ; L'pool Col. 



Tablet 2032 contains a fresh and beautifully coloured speci- 

 men. 



561. CEEITHIOPSIS CONVEXA, n. s . 



C. t. gracili, albo-fuscd, inarginibus spir& rectis ; anfr. x. 

 normalibus, valde convexis, suturd profundd, eleganter cancel- 

 latis ; costis spiralibus iv., super costas radiantes circiter xiii. 

 undulantibus, ad inter sectiones subnodosis ; interstitiis quadra- 

 tis, intus concavis / carind circa peripJieriam hand tuberculosd ; 

 basi concavd, sublcevi ; aperturd rotundatd ;< labio distincio, 

 haud prominente, rimam umbilicalemformente. 



This beautiful species is cancellated as in Phos ; and is 

 remarkable for the convexity of the whirls. The nuclear 

 whirls are decollated. Long. '18, long. spir. '146, lat. *056, 

 div. 12. 

 Hab. Mazatlan ; 1 fresh sp. off Spondylus ; L'pool Col. 



Tablet 2033 contains the specimen. 





