NEWTON : CONCHOLOGICAL FEATURES OF LENHAM SANDSTONES. I43 



and thread-like spiral striations. From gutta-percha model, 

 X 2. [M.P.G., No. C.R., 1277]. 



Fig. ig. — Dorsal view of another specimen with a slightly more 

 oblique suture. From a gutta-percha model. 



[M.P.G., No. 474]. 



Maculopeplum lamberti J. Sowerby, sp. 

 Fig. 20. — Natural sandstone cast of an anterior fragment of an adult 

 form of this species. [B.M., Graham Wallas Coll.]. 



RiNGICULELLA LENHAMENSIS Sp. nOV. 



Fig. 21. — Apertural view showing sub-cylindrical form with nearly 

 parallel sides, biplicated columella, and smooth surface. 

 From a gutta-percha model, x i|. [M.P.G., No. 465]. 



Fig. 22. — Dorsal aspect of a larger specimen, showing well-produced 

 spire, and the thickly margined outer-lip. From a gutta- 

 percha model, X t|. [M.P.G., No. 465]. 



MUREX BADENSIS NySt. 



Fig. 2 J. — View of an imperfect specimen, with deeply sutured, angu- 

 late whorls bearing distant ridge-like vertical costje, and 

 obscure spiral striations. From a gutta-percha model. 



[M.P.G., No. 464]. 



Fig. 24. — Enlarged view of same specimen, x 2. 



PLATE 4. 



Gastropoda and Pelecypoda (existing) and 

 Brachiopoda (extinct). 



Pyrula reticulata Lamarck. 

 Fig. 7.— A fragmentary sandstone cast, showing the rounded summit 

 region, and the strong equi-distant spiral region, as well as 

 the close and fine vertical striations. [M.P.G. , No. 463]. 



Fig. 2. — Anterior fragment of another specimen, with more definite 

 sculpture characters. From gutta-percha model. 



[M.P.G., No. 463]. 



Semicassis saburon Bruguiere. 

 Fig. J. — Dorsal view of a sandstone cast, showing the elongately oval 

 body-whorl (spire not preserved), and furnished with a wide 

 groove bordering the outer margin of the aperture, which 

 represents the thick reflected lip. [M.P.G., No. 442]. 



