20 



MAZATLAN BIVALVES 



GENUS EUPELLAEIA, Bellevue. 



Hupellaria, Fleuriau de Bellevue, 1802, Bullet. Soc. PMlom. 



nr. 62. Pkilippi, Handb. d. Conch, fy Mai. in loco. 

 Gastrana, Sckum. 1817. 

 Venerupis, Lam. ISlS.DesL B. M. Cat. Ven. p. 189. 



27. RUPELLARIA LINGUA-FELIS, n. S. 



V. t. subcylindricd, albd, tenuissime et dense granulosd, sub- 

 diaphand ; granulis irregulariter confertis, lineis radiantibus 

 confluentibus ; circa umbones l&vigatd, liris concentricis inter- 

 ruptd ; strias incrementi nonnunquam monstrante ; lunuld in- 

 distinctd; umbonibus prominentibus ; intus politd, margine pland ; 

 impressiones musculares vix monstrante, sinu pallii magno, 

 circulari ; dentibus 3 2, quarum una bifida ; nympMs et liga- 

 mento parvis ; dentibus et nympMs supra lineam cardinalem 

 intus prominentibus. 



Shell in shape like P. mirabilis, Desk., 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 'H, *16, '09. 



Hab. Mazatlan ; in Chamse and Spondylus Lamarckii, nestling 



in burrows, rare ; L'pool fy Havre Coll. 



Tablet 72 contains 5 specimens in various stages of growth. 



28. RTJPELLABIA EXAEATA, n. s. 



V. t. forma " Linguce-felis" simili, umbonibusque ut in specie 



Hid : sed radiatim tenue sulcatd, albicante, rufo-fulvo macu- 



latd : fortiori, nee intus politd : dentibus 3-3, quarum una 



bifida, extantibus : epidermide tenui, fused. 



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. 



