74 PROCEEDINGS OF THE M.VLVCOLOGICAL SOCIETY. 



Megasi'ir.v monodonta, n.sp. PI. VI. Fig. 3. 



Pupa monodonta (Edwards ItCS.), Meqaspira monodonta, J. S. 

 Gardner.— Geol. Mag. 1885, p. 251. li. B. Xewton.— Syst. List 

 Edwards Coll. British :Muscmn, 1891, p. 274. 



Sholl elongate and cylindrical ; wliorls slightly convex, body whorl 

 rounded at the shoulder ; ornamented with closely set, rather acute, 

 undulating, obli(pie ridges, which continue, though not so prominently, 

 over tlie base of the shell to the columella; aperture narrow; columella 

 furnished with three oblique laniinte, beneath wluch, on the body 

 whorl, is the typical parietal plication. Alt. 8 ; diam. 4 mm. 



One example only of this species is known to us, and that is 

 imperfect. It consists of the last two whorls, with a well-preserved 

 aperture containing all the elements of tliis genus. It differs primarily 

 from 31. cylindrica in possessing a rounded shoulder and in the more 

 distinct continuation of the ornamental striations over the base to the 

 columella ; the columellar plications arc also disposed more obli(|uely. 

 The specific name is not very applicable, but in view of the fact that 

 it has been introduced into literature we prefer to retain it. Mr. 

 Edwards, no doubt, was guided in his designation by reason of the 

 prominent parietal plication, which, of course, was not characteristic of 

 PiqM, under which genus he incorrectly arranged it. To Mr. J. S. 

 Gardner is due the credit for having first recognized this specimen as 

 a form of Mcgaspira. 



Formation. — Oligocene (Bembridge Beds). Localitij. — Headon Hill. 



COCHLICOPA (Ferussac, 1819), Risso, 1826. 

 CocHLicoPA Headonensis, n.sp, PI. VI. Fig. 4. 



Zua Headonensis (Edwards MS.), CocJdicopa Headonensis, R. B. 

 Newton. — Syst. List Edwards Coll. British Museum, 1891, p. 274. 



Shell elongate and sub-cj'lindrical ; number of whorls uncertain ; 

 apex missing ; last whorl of large size ; suture slightly oblique ; 

 aperture narrow, ovate ; surface plain. Alt. 4 ; diam. 2 mm. 



This species is founded on a somewhat imperfect cast, with the apex 

 wanting. Three volutions only can be traced, the two earlier ones 

 indicating a gradual increase in width with slightly fiattened sides ; 

 the body whorl is long and would probably measure about half the 

 length of the entire shell. We have followed Mr. Edwards in 

 referring this specimen to Cochlicopa, or Zua as he called it, the former 

 name taking precedence on account of its earlier date. The general 

 contour and appearance of this species bears a similarity to the type 

 fonn [Helix luhrica, Miiller) of the genus. So far as we are aware 

 this genus has not been recorded from beds of a similar ago elsewhere. 



Formation. — OKgocene (Bembridge Beds). Locality. — Headon Hill. 



LIMN2EA, Lamai'ck, 1799, em. S. Rang, 1829. 



LniN-EA Headonensis, n.sp. PI. VI. Fig. 2. 



Limnoia, n.sp., E. B. Newton. — Syst. List Edwards Coll. British 

 Museum, 1891, p. 280. 



