140 JOURNAL OF CONCHOI.OGY, VOL. 15, NO. 5, JANUARY, I917. 



Fig. 7. — Dorsal view of same, showing pronounced convexity of the 

 valves and well-marked lunule. From a gutta-percha model. 



[M.P.G., not numbered]. 



Anadara diluvii I.amarck, sp. 



Fig. 8. — External view of a right valve, showing the strong, radial 

 costfe and deep sulcations, concentric striae, and the more 

 or less distant growth lines. From a gutta-percha model. 



[M.P.G., No. 410]. 



Margaritifera phalaenacea Lamarck, sp. 



Fig. g. — Natural sandstone cast, showing the summit region of a left 

 valve, the rectilinear hinge-line, the inflated umbonal area, 

 and the nearly vertical anterior side. [M.P.G., No. 409.] 



Spisula arcuata T- Sowerby, sp. 



Fig. 10. — Lateral view of a left valve, preserved as a sandstone cast, 

 with its ovate-trigonal contour, obtusely-ridged posterior 

 region, and obscure lines of growth. [M.P.G., No. 429]. 



Fig. II. — Cardinal fragment of the left valve of another specimen, 

 showing compressed umbo, the lateral teeth, and the prom- 

 inent trigonal cavity for the reception of the ligament. 

 From a gutta-percha model. [M.P.G., No. C.R. 1260]. 



Glans senilis Lamarck, sp. 



Fig. z^.— External aspect of a left valve, showing an obliquely cor- 

 date shape, and furnished with convex and robust ribs, 

 possessing obscure squamose sculpturing. From gutta- 

 percha model. [M.P.G., No. 417]. 



Cyprina rustica (?) J. Sowerby, sp. 



Fig. I J. — Natural sandstone cast of a fragmentary left valve, with a 

 cordate-globose contour, a well-defined lunuloid area, and a 

 widely truncated posterior side. [M. P.G., No. 421]. 



Gastrana laminosa J. de C. Sowerby, sp. 



Fig. 14.. — Latero-dorsal view of a fragmentary left valve of about 

 medium size, showing the long posterior margin ; associated 

 in same block of sandstone with an example of Panopea 

 menardi. 



Fig. ij. — Magnification of sculpture of same specimen displaying the 

 ^ concentric costae and numerous fine radial striations. From 



gutta-percha model. [M.P.G., No. 428]. 



