74, MAZATLAN BIVALVES 
Hab.—Mazatlan ; about a score were found in the dirt frora 
the small Olive ; L’pool Col. 
Tablet 350 contains 4 pairs decussated.—351, 1 pair and a 
See ridges predominant.—352, 2 pairs, nearly 
smooth. 
104 Venus (? CHIONE) pistans, Phil. 
Venus distans, Phzl. in Zeit. f. Mal. 1851, (Cassel 1852) p. 126. 
? Chione distans, Desh. 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, H. B. Philippi? Mazatlan, 1 valve off Spon- 
dylus ; L’pool Col. 
105. Venus (CHIONE) CRENIFERA, Sow. 
Venus crenifera; Proc. Zool. Soc. 1835, p. 43.—Hanl. Deser. 
Cat.p.118: Wood Suppl. pl. 16, f. 30.—B. M. Cat. D’ Orb. 
Moll. p. 67, no. 603.—Sow. Thes. Conch. pt. 14, pl. 156, 
ih es (AG 
Chione crenifera, Desh. B. M. Cat. Ven. p. 136, no. 50. 
?=V. elevata, Say teste Sow. 
P=V. radiata, Chemn. t. 36, f. 386, teste Sow. 
=V. portesiana, D’Orb. Voy. Am. Mer. Moll. p. 556, pl. 83, 
f. 1, 2, teste Desh. 
This shell belongs to a group of closely allied Species, one of 
which is fromthe 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 m 
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 Jong. 1°64, lat. 1°87, alt. 1°08. 
Hab.—St. Elena, in sand at low water; var. Payta (Peru) ; 
Cuming.—Payta, D’ Orbigny.— Mazatlan: extremely rare ; 
L’pool Col. 
