20 MAZATLAN BIVALVES 
Genus RUPELLARIA, Bellevue. 
Rupellaria, Flewriau de Bellevue, 1802, Bullet. Soc. Philom. 
nv. 62.—Philippi, Handb. d. Conch. § Mal. in loco. 
Gastrana, Schum. 1817. 
Venerupis, Lam. 1818.—Desh. B. M. Cat. Ven. p. 189. 
27. RUPELLARIA LINGUA-FELIS, 2. S. 
V. t. subcylindricd, alba, tenuissime et dense granulosa, sub- 
diaphand; granulis irregulariter confertis, lineis radiantibus 
confluentibus ; circa wmbones laevigata, liris concentricis inter- 
ruptad ; strias incrementi nonnunquam monstrante ; lunula in- 
distinctd; wmbonibus prominentibus ; intus politd, margine plana; 
impressiones nusculares viz monstrante, sinu palli magno, 
circulart ; dentibus 3—2, quarum una bifida; nymphis et liga- 
mento parvis; dentibus et nymphis supra lineam cardinalem 
intus prominentibus. 
Shell in shape like P. mirabilis, Desh., which represents it on 
the Californian coast; but recognized at once by its surface 
which presents, under the microscope, most delicate granula- 
tions somewhat like Tellina lingua-felis, whence its name. 
Smallest specimen measures long. ‘025, lat. 03, alt. *02, 
Largest 9 ” 33 2BP 16, 99 ‘09. 
Hab.—Mazatlan ; in Chame and Spondylus es cku, nestling 
in burrows, rare ; T’pool & Havre Coll. 
Tablet 72 are 5 specimens in various stages of growth. 
28. RUPELLARIA EXARATA, 7. s. 
Vt. forma “ Lingue-felis” simili, umbonibusque ut in specie 
ili: sed radiatim tenue suleatd, albicante, rufo-fulvo macu- 
lata: fortiori, nec intus politi: dentibus 3-3, quarum una 
bifida, extantibus : epidermide tenut, fusca. 
Shell in size and shape like V. lingua-felis, but wanting the 
granulose texture, and covered (except at the umbos, which are 
concentrically striated) with very fine rather irregular radiating 
ribs, as in Petricola, interrupted occasionally by lines of growth. 
Colour whitish, stained with chocolate. Hinge teeth projecting 
upwards, not sideways as in the last. Pallial sinus large, well 
rounded. These shells have the general appearance of Naranio, 
Gray. 
