74 ■ MAZATLAN BIVALVES 



Sah. — Mazatlan ; about a score were found in the dirt from 

 the small Olivee ; L'^iool Col. 



Tablet 350 contains 4 pairs decussated. — 351, 1 pair and a 

 valve, concentric ridges predominant. — 352, 2 pairs, nearly 

 smooth. 



104 Venus (PChione) distans, Phil. 



Venus distans, FMl. in Zeit.f. Mai. 1851, (Cassel 1852) p. 126. 

 ? Chione distans, Besh. B. M. Cat. Ven. p. 123, no. 13. 



Tablet 353 contains a worn valve, with 2 stout concentric 

 ridges, which comes nearest to this species. Length '07. 

 Hab. — Panama, E. B. Philippi. — ? Mazatlan, 1 valve off Spon- 



djlus ; L'pool Col. 



105. Venus (Chione) ceenifeea. Sew. 



Venus creuifera ; Froc. Zool. Soc. 1835, p. 43.—IIa7il. Bescr. 



Cat. p. 118 : Wood SuppL pi. 16, f. 30.— JB. M. Cat. BOrh. 



MoU. p. 67, no. 603.— >So?r. Thes. Condi, pt. 14, pi. 156, 



f. 73, 74. 

 Chione crenifera, Besh. B. M. Cat. Ven. p. 136, no. 50. 

 ? = V. elevata. Say teste Sow. 

 .?=V. radiata, Chcmn. t. 36, f. 386, teste Sow. 

 = V. portesiana, BOrh. Voi/. Am. Mer. MoU. ■&. 556, pi. 83, 



f. 1, 2, teste Besh. 



This shell belongs to a group of closely allied species, one of 

 whicli is from the W. Indies. I am not sui-e that it is rightly 

 named, but I follow Mr. lleeve's authority. It fits the original 

 description, as others might, but not the figure or notes in 

 Sow.'s The.s. Conch. The radiating lines scarcely ever group in 

 threes ; the shape is suboval, scarcely beaked ; the dorsal area 

 is nearly smooth in one valve, Init v^ith the concentric ridges 

 continued over in the other, A\hic]i overlaps beyond the liga- 

 ment. Surface very irregularly spotted with light chocolate 

 brown. Concentric ridges (wliich are more or less close) 

 strongly indented and rather glossy. Pallial sinus small, sub- 

 oval.— Anterior tooth prolonged, sharp: cardinal,^ sub-bifid. 

 Largest specimen (worn) measures long. 1'64., lat. 1'87, alt. 1"08. 

 Hab.— St. Elena, in sand at low water ; vai: Payta (Peru) ; 



C«??jwif/.— Payta, BOrbig»i/.—yiazat\an: extremely rare; 



L'lwol Col. 



