614 PLIOCENE MOLLUSCA. 



Disiribution. — Not known living. 

 Fossil : St. Ertli. 



Remarks. — 'This specimen from St. Ertli belongs to the British Musenm, where 

 it bears Mr. Bell's name of R. erecta. He considers it a distinct species and so far 

 as he knows nnique. 



Alvania Enysii (A. Bell). Plate LI, fig. 30. 



1898. Bissoa Enysii, A. Bell, Trans. E. Geol. Soc. Coniwall, vol. xii, p. 151, pi. ii, fig. 12. 



Specific Characters. — Shell small, elongato-conical ; whorls 7 — 8, nearly flat, 

 slightly angulate or constricted immediately below the suture; spire regularly 

 tapering to a blunt point; suture Avell marked; ornamented by numerous straight 

 costEe which die out on the last whorl, hardly extending to the base, and l)y 

 distinct spiral ridges which are continuous l)eyond the termination of the ribs' 

 crossing the latter, producing slight tuberculation where they intersect, and are 

 prominent at the base of the shell ; mouth ovate, angulate, with a small chink 

 above; outer lip roundly lunate; peristome continuous; inner lip slightly deflected 

 in front of a minute perforation. 



Dimensiovs. — L. 6 mm. B. 3 mm. 



Distribution. — Not known living. 

 Fossil : St. Erth. 



RemarliS. — This species, which Mr. Bell considered a distinct form, was 

 originally described from a specimen found by him now in the Museum of the 

 Royal Geological Society at Penzance. Others have been found since, one of them 

 being in the Sedgwick Museum at Cambridge (here figured) and another in the 

 British Museum of Natural History. It was named after Mr. J. D. Enys, who was 

 President of the above-named Society when Mr. Bell's paper was submitted to it. 



Alvania dubiosa, Etheridge and Bell, MS., sp. nov. Plate LI, fig. 31. 



Specific Characters. — Shell minute, solid, ovato-conical ; whorls 5, convex, the 

 last tumid, about two-thirds the total length, the three lower ones ornamented by 

 well-marked longitudinal ribs, nearly straight, which die out or are cut off by 

 strong spiral ridges, continuous to the base ; upper whorls without sculpture ; spire 

 turreted, decreasing in size, compressed above, ending in a blunt rounded point ; 

 suture deep ; mouth oval, rather short, expanded below, outer and innei- mouth 

 thickened. 



Dimensions.- — L. 3*5 mm. B. 2 mm. 



Distrihdion. — Not known living. 

 Fossil : St. Erth. 



