74 MAZATLAN BIVALVES 



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

 the small Olivae ; L'pool Col. 



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

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

 smooth. 



104 VENUS (? CHIONE) DISTANS, Phil. 



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

 ? Chione distans, Desk. B. M. Cat. Yen. p. 123, no. 13. 



Tablet 353 contains a worn valve, with 2 stout concentric 

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

 JIab. Panama, E. . Pkilippi.? Mazatlan, 1 valve off Spon- 



dylus ; L'pool Col. 



105. VENUS (CHIONE) CKENIFERA, Sow. 



Venus crenifera ; Proc. Zool. Soc. 1835, p. 43. Hani. Descr. 



Cat. p. 118 : Wood Suppl. pi. 16, f. 30.5. M. Cat. DOrb. 



Moll. p. 67, no. 603. &w. The*. Conch, pt. 14, pi. 156, 



f. 73, 74. 



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

 ? = V. elevata, Say teste Sow. 

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

 =V. portesiana, D'Orb. Voy. Am. Mer. Moll. p. 556, pi. 83 y 



f. 1, 2, teste Desk. 



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

 which is from the W. Indies. I am not sure that it is rightly 

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

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

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

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

 is nearly smooth in one valve, but with the concentric ridges 

 continued over in the other, which overlaps beyond the liga- 

 ment. Surface very irregularly spotted with light chocolate 

 brown. Concentric ridges (which 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. 

 Sab. St. Elena, in sand at low water ; var. Payta (Peru) ; 



Cuming.Payt&, D'Orligny. Mazatlan : extremely rare ; 



L'pool CoL 



