32 MAZATLAN BIVALVES 
Genus TELLINA, Lin. 
47. TELLINA RUFESCENS, Chemn. 
Chemn. vi. p. 105. t. 11. f. 97.—Schroeter, Hinl.t. 3, p.5. no. i1.— 
Dilw. Desc. Cat. vol. i. p. 85.—Knorr, vol. vi. t. 12, f. 1.— 
Hand. in Sow. Thes. Conch. vol. i. p. 807, pl. 63, f. 213. 
=T. operculata, Gimel. p. 3235, no. 32, Var. exc.—Lam. ed. 
Desh. 1836, vol. 6, p. 192.— Wood's Ind. Test. p. 19, no. 37.— 
Hanl.« Descr. Cat. p, 62, t. 4, £. 37. 
=T. cruenta, Solander, ms.—Portland Cat. p. 58, lot 1360. 
=T. opercularis Sow. Gen. no. 31, f. 1—Desh. Ene. Meth. 
vers t. 3, p. 1010, no. 9. 
This shell must not be confounded with T. rufescens of Gmel. 
which= Venus decussata, var ; nor with the too-similarly named 
T. rubescens of Hanl., a shell found as far north as 8S. W. Mexico, 
(P. P. C.) but not yet obtained from Mazatlan. T. rufescens 
is known at once by its large size, red colour (often banded 
with whitish,) and greatly produced beak. Lower valve pro- 
jecting, as in Corbula, and displaying faint radiating lines, 
which are generally obsolete on the upper. It gapes at both 
ends, and nearly approaches Sanguinolaria. Zong. 1°73, dat. 
Salt: 11. 
Hab.—Coasts of Brazil, Humphreys.—Caribbean Sea, Lam. 
“Cab. de M. Dufrene.”—(Indian Ocean, Wood.)—Tumbez, 
(Peru,) in soft, sandy mud, 5 fm., Cuming. Mazatlan; rare; 
L’pool & Havre Coll. 
The authorities for the Atlantic Ocean do not appear satis- 
factory. On the other hand, the shell being known to the old 
writers is in favour of its having been brought from the West 
Indian seas. 
Tablet 109 contains 1 small specimen from the L’pool Col., 
and 1 large one from the Havre Col. in which it was less un- 
common. 
48. Tectina Broperipit, Desh. ns. (teste Cum.) 
Compare Tellinides purpureus, Brod. & Sow. Zool. Journ. 
vol. iv. p. 363.—Zool. Beech. Voy. p. 153, pl. 42. f. 2—=Tel- 
lina purpurascens, Hanl. Descr. Cat. p.74, swppl. pl.9, f. 18: 
do. in Sow. Thes. Conch. p. 295, no. 141, pl. 62, f. 194. 
