MAZATLAN BIVALVES Su 
Rathke, Siemaschké.—Santa Barbara, abundant, Nuttall.— 
Mazatlan: not common; L’pool Col. 
Tablet 129 contains 6 pairs and 2 valves, shewing variations. 
The smaller valve may be T. cicercula, Phil., in Zeitschr. fiir 
Mal. Feb. 1846, p.19. I cannot however separate it from 
S. earnaria, of which it appears the young. The description of 
T. cicercula exactly applies to this, which is the left valve. 
Menke in quoting the species among Melchers’ Mazatlan Shells, 
Zettschr. f. Mal. 1847, p. 188, no. 53, says that it is only the left 
valve which possesses the sculpture in question : so does the left 
valve of T. carnaria, and that alone. Menke Joc. ett. deseribes a 
new species, T. areolata, from the West Indies, intermediate 
between T. cicercula and T. carnaria, with a similar smooth 
space on the left valve.—Philippi also describes from Mazatlan 
(loe. cit.) T. lenticula, T. dichotoma, and T. ervilia. In his 
Abbil. Conch. for Aug. 1846, p. 24, he also gives the ancient 
T. pisiformis, Linn. (along with Diplodonta semiaspera) as 
common to Mazatlan and the Caribbean Sea. Mazatlan must 
be rich in Strigille, according to Philippi! 
67. PSTRIGILLA LENTICULA, Phil. 
Tellina lenticula, Phil. in Zeitsch. f. Mal. 1846, p. 19. 
Tablet 130 contains a broken specimen which probably be- 
longs to this species, which, says Philippi, while agreeing in 
form and size with T. pisiformis, has the sculpture of Lucina 
digitaria. It may however belong to Lucina eburnea, Rve. 
Conch. Icon. pl. 8, f. 49, found in sandy niud, 11 fm., St. Elena 
and Panama, Cuming. 
Hab—Mazatlan, Philippi? Do. fragments, off the back of 
Chama; L’pool Col. 
68. 
Tablet 131 contains a fragment of a thin shell of moderate 
size, perhaps a Psammobia, (possibly an unknown Donax,) 
strongly angulated, with very fine, slightly rugose stric. 
coarser on the angular part. It is white, slightly bordered 
with orange. 
Hab.—Mazatlan ; confined in the mouth of Trivia sanguinea ; 
LT’ pool Col. 
= aS. 
