258 



OlSr THE TOPOGRAPHY AND GEOLOCiY 



living in the Tertiary seas which divided North from South Americ-a, it is now, so 

 far as we know, extinct. At the time of writing mj second vohime of the California 

 reports, I was not acquainted with Sowerby's two-line description, and thus, un- 

 fortunately made a synonym. 



In addition to these two species there are valves indicating two or perhaps three 

 other species of small oj^stei's, among which one appears to be the common Mangrove 

 oj^ster, O.froiis L. {Umacella, Lam.) 



I have also two or three undeterminable species of Mactras and Tellinas. 



List of the Post Pliocene Fo-'^sils from the Antillite or " Coast Limestone '' Beds near 



Macoris. Collected hy Mr.Bonaczy. 



Murex re cu r v i r o s 1 1- i s. Brod., Proc. Zool. Soc, 1832. 



M. pomum. Gruel., Syst. Nat., p. 3527. . 



M. he xagonus. Lam., A. S. V., Vol. IX., p. 585. ' ' . ■ ' ' ' 



Tritonium c o m m ix t a t u m. Dlir. 



Lagena c i n giil i f e r a. Lam., A. S. V., Vol. IX., p. 384. 

 Columbella mercatoria. Linn., s. p., Grael., Ed., p. 8446. 



Cyprfea s p u r c o i d e s. Gabb, supra. 



Cyphoma gibbosa. Linn. . ■ 



Cerithnm pictum. Wood, Ind. Test. Supp., pi. 5, fig. 4-5. 

 Turritella exoleta. Linn, sp.. Gruel., Ed., p. 3607. 



Petaloconchus sculpturatus. Lea. ? Tr. Am. Phil. Soc., Vol. IX., p. 230. 



Attached to the Gerithium is a partially spiral tube with the external sculpture of 

 this species. 



Lucapina alternata. Say. sp.. Jour. Phil. Acad., 1 Ser., Vol. II., p. 224. 

 Scurria mitra. Esch. sp., Zool. Atl., 1833, p. 18, pi. 23, fig. 4. 

 Rocellaria. sp. ? 



A broken specimen ; indeterminable. 



Corbula carinifera. Gabb, n. s. 



Shell sub-quadrate, convex ; beaks central, antei'ior end sloping above, rounded below, base slightly sloping 

 upwards posteriorly ; posterior end obliquely sub-triangular ; a sliarp erect rib running from the beaks to the base 

 on the umbonal angle, with a less marked one behind it, becoming gradually obsolete as the shell grows older ; 

 surface marked by small i-egnlar concentric ribs. 



l^earest in size and form to C. Lavalemia, d'Orb., from which it can be distin- 

 guished by its being much less produced posteriorly, and b}^ the peculiar erect rib 

 on the iimbonal ridsre. I 



