MORRIS — WOOLWICH AND READING FOSSILS. 159 



An ovate and somewhat spatliulate-form shell, inequilateral, the 

 surface marked with concentric irregular striae ; anterior margin 

 rounded, posterior extremity produced and sinuated, posterior dorsal 

 margin somewhat incurved. 



This shell, which is referred with some doubt to the genus Psam- 

 mobia, from its association with fiuviatile forms, appears to be readily 

 distinguished from the other Eocene species by the more spathulate 

 form and the position of the umbones being nearer to the anterior 

 margin. 



This interesting form was found by the Rev. H. De la Condamine, 

 in the clay bed at Counter Hill, Deptford. 



Auricula (Conovulus) pygm^ea, n. sp. Pl. II. fig. ] 7. 



A few small shells, apparently belonging to this genus, have been 

 found by Mr. Rosser in the upper beds at Woolwich. 



The shells are conical, and consist of four or five somewhat de- 

 pressed volutions, and aii ovate aperture with one fold in the colu- 

 mellar lip, and another towards the base. 



Cerithium Bowerbankii, n. sp. Pl. II. fig. 18. 



Testa turrita, brevi ; anfractibus suby)lanis, longitudinaliter nodoso-costatis ; 

 costis obliquis, transversim 3-4-plicatis ; sutura subprofunda. 



A turrited shell with nine or ten somewhat depressed volutions, 

 with six to eight nodose costse, which are obliquely arranged in lon- 

 gitudinal rows, and crossed transversely by three or four transverse 

 obtuse ridges. 



Rare in the upper beds of the Woohvich series. From Mr. Bower- 

 bank's collection. 



Cerithium gracile, n. sp. Pl. II. fig. 19. 



Testa elongata, gracili ; anfractibus depressis costatis ; costis parvis sub- 

 obliquis ; sutura linea ornata. 



An elegant and slender shell with numerous volutions, furnished 

 with eight or nine small oblique costse ; suture slightly depressed 

 and marked with a fine line. 



Rare in the clays and fossiliferous sands of Woolwich. From the 

 Rev. Mr. De la Condamine's collection. 



Cerithium Lunnii, n. sp. Pl. II. fig. 20. 



Testi turrita, brevi ; anfractibus 7, transversim bicarinatis ; interstitiis lon- 

 gitudinaliter striatis. 



A small conical shell of about seven carinated volutions ; the two 

 principal obtuse carinas occur on the body of each volution, with a 

 smaller one near to the suture : the intermediate spaces are longi- 

 tudinally striated. 



A rare shell. It occurs with the last species. From Mr. Luim's 

 collection. 



