THE NON-MARINE MOLLUSCA OF THE WALTON CRAG. 11'] 



2. Hygromia incarnata. (Miill.) 



H&lix incarnata, R. Bell; "Land Shells in the Red Crag." Geol. 

 Mag., 1S84, vol. i., p. 262. 



The unique example of this species from the Walton Crag 

 is now in the British Museum (Natural History), and was 

 obtained in 1882 by the late Mr. Groom {alias Groom-Napier, 

 the soi-disant " Prince of Mantua "). It is by no means a perfect 

 example, but no doubt can be entertained of the determination. 

 On the Continent the only fossil record of this species is from 

 the middle Pleistocene of Cannstadt. 



3. Helicodonta lens. (Fer.) 

 Helix lens, Fer. ; R. Bell, op. cit., p. 262. 

 A single example of this species is stated by Mr. Bell to 

 have been found at Walton by Mr. Larcher, of King's College, 

 in 1881, and to have been identified by Dr. J. Gwyn Jeffreys 

 and Mr. J. H. Ponsonby, but we have failed to trace the 

 specimen. It is quite unknown in a fossil state on the Continent. 



4. Helix lactea. (Miill.) 



A fine example of this species is in the Robert Bell Collec- 

 tion in the British Museum (National History), and is without 

 doubt the specimen found in 1883 at Walton by Mr. Bell, and 

 recorded by him in the following year.^ A fragment of another 

 example is said to have been found at the same time, but this we 

 have failed to trace. This form is unrecorded in a fossil state 

 on the Continent. 



5. Paludestrina stagnalis. (Bast.) 



Paliidestiina iihhr, Penn.: S. V. Wood, Crag Moll., vol. i., p. 109, and 

 Suppt. i., p. 71, pi. iv., fig. 23, as Hydrobia Jilva ; -Hydrobia vlvis, 

 Penn. : J. Gwyn Jeffreys, Quart. Jour. Geol. Soc, vol. xxvii. (1S71), 

 p. 490. 



This species is recorded from Walton by Mr. A. Bell, We 

 have not seen any examples, but there is no inherent impossi- 

 bility in the record, since it occurs in the Lower Pliocene 

 (Congeria) Beds) at Mauer, near Vienna, and Bizenz, in Moravia. 



8. Paludestrina ventrosa. (Mont.) 



Paludcst''iua suhumhilicata, Mont. : S. V. Wood, Crag Moll., vol. i.. 

 p. 108, pi. xi., fig. 2; Hydrobia ventrosa, Mont.: J. Gwynn 

 Jeffreys, Quart. Jour. Geol. Soc., vol. xxvii. (1871), p. 490. 



2 R. Bell.—" Land Shells in the Red Crag." Geol. Mai^., 1884, p. 264. 



