MAZATLAN BIVALVES 39 
with the surface indented may be an older form of the same 
species. Shell suborbicular, lateral teeth distinct. 
Hab—Mazatlan ; from Spondylus washings ; L’pool Col. 
65. Tentina Burnett, Brod. & Sow. 
Zool. Journ. vol. iv, p. 362, t. 9, f. 2—Hanl. Descr. Cat. p. 72, 
t. 13, f. 51.— Hanl. in Sow. Thes Conch. vol. i. p. 271. 
=Lucina cristata, Recluz, teste Jaz. 
After examining more than 800 specimens of this most 
aberrant shell, I cannot quote any noteworthy variations. It 
seems as though the creature was quite satisfied with its beauty, 
without endeavouring to improve it. The valves however are 
occasionally a little more bent, and the strie and knobs a 
little more or less close. To the shape of a Myadora, it adds 
the hinge of a Tellina. It has an Atlantic analogue, T. lunulata, 
found fossil in the Pleistocene beds of 8S. Carolina. In this 
however, the left and not the right valve is flat. A species of 
similar form is found fossil in the paleozoic rocks, agreeing 
more with the Atlantic shell. (Woodw.) T. Burneti owes 
its present wide distribution in collections to this importation 
from Mazatlan: even this spring a specimen was sold ata 
London sale for 15s. Long. 1°23, lat. 1°37, alt. °23. 
Hab.—¥ound in the Estuary of Mazatlan, among the shoals 
of large Pinne which are left dry at low water, Lieut. Bel- 
cher.—Salango, W.Columbia, Hanley.—St. Elena, Cuming.— 
Gulf of California, Mus. Cum.—W. Columbia, Lieut. Freer 
in Bristol Museum.— Mazatlan ; not uncommon ; L’pool Col. 
Tablet 128 contains 3 specimens of different ages. 
Genus STRIGILLA, Twrt. 
Strigilla Turton, pars, Tellina, auct. A group of Tellinids 
conveniently separated for their Lucina-like shape and di- 
varicated sculpture, 
66. SrrictLua (Tellina) carnarta, Linn. 
Tellina carnaria, Linn. Syst. Nat. ed. 12, p.1119.—Donor. Br. 
Shells, vol. u. pl. 47.—Linn. Trans. vol. viii. p. 57.— Dorset 
Cat. p. 31, pl.5, f. 6.—Turt. Conch. Dict. p. 177.—Chemn. 
Conch. Cab, vol. vi. p. 130, pl, 13, f. 126.— Wood Ind. Test. 
