MAZATLAN BIVALVES 97 
Lucina tigerina, Desh. Enc. Méth. vers. t. 2, p. 384, no. 37.-- 
Sow. Gen. Luce.— Desh. in Lam. loc. cit. p. 318, (2).— Forbes 
&§ Hanl. Br. Moll. vol. ii. p. 64.—B. M. Cat. Cuba Moll. 
p. 41, no. 499. 
This abundant W. Indian shell will not be received by many 
as belonging to the Pacific fauna. I can only say that 1 found 
the specimen, papered and numbered in the Dosinia box, per- 
fectly fresh, and bearing every mark of having been taken 
alive. <As further evidence of its lingering existence in these 
seas, I record finding a fresh valve among a collection from the 
S. W. Mexican coast. The shells are both exactly like the 
- normal W. Indian type, and differ essentially from its Panama 
analogue, L. punctata, Linn. Long. 1°48, lat. 1°6, alt. °58. 
Hab.—West Indies, passim. (Jamaica, Lister.—Barbadoes, 
P. P. C.—St. Domingo, D’Avila.—Cuba, Sagra.)—Amboyna, 
Rumphius.—Nicobar Is., Chemnitz.—| Britain, Montague, 
&c. Pimported. |—S. W. Mexico, 1 fresh valve, P. P. C— 
Mazatlan ; 1 fresh specimen; L’poel Col. 
Tablet 464 contains the specimen. 
137. Lucina PPpunctTata, Linn. 
Venus punctata, Linn. Syst. Nat. p. 1134.—Chemn. Conch. 
Cab. vi. p. 15, pl. 37, £. 397-8. 
Cytherea punctata, Lam. An. s. Vert. vol. vi. p. 319, no. 54. 
Lucina punctata, Desh. Dict. Class. @ hist. nat. t. 9—Sow. Gen. 
Lue. f. 1.— Rve. Conch. Ic. pl. 1, f. 2. 
Tablet 465 contains two minute valves, ‘03 across, which are 
evidently the young of a somewhat large species, perhaps this, 
One of them has close radiating ribs from the commencement ; 
the other is smooth, with strie of growth ; till, near the margin, 
after a sharp concentric ridge, it suddenly betakes itself to 
making longitudinal ribs. The teeth somewhat resemble the 
young of Dione, with the extreme ones very large in proportion. 
HHab.—‘V’Ocean des Grandes Indes,” Lamareck.—Panama, on 
the sands at low water, Cuming.—?? Mazatlan ; jun. extreme- 
ly rare, in shell washings ; L’pool Col. 
138. Lucina PANNULATA, Reeve, 
Reeve, Conch. Ic. pl. 4, f. 17. 
Tablet 466 contains a fragment with rounded eoncentric ribs, 
and very fine concentric strie traveling over -both ribs and 
Nov. 1855. k 
