28 PLIOCENE MOLLUSCA. 



Genus LIMN^A, Lamarck, 180L 



Limnsea butleyensis, Kennard and B. B. Woodward. 



1848. Limnma trv,ncatula, S. V. "Wood, Mon. Crag Moll., pt. i, p. 8, tab. i, fig. 8a. 



1872. Limniea Holhollii, S. V. Wood, Mou. Crag Moll., 1st Suppl., p. 3. 



1899. Limnsea truncatula (part), Kennard and B. B. Woodward, Proc. Malac. Soc , vol. iii, p. 196. 



1911. Luiiiuea hntleijensis, Kennard and B. B. Woodward, Geol. Mag. [5], vol. viii, p. 402. 



Specijie Gliaracters. — Shell small, ovato-conical, thin ; spire elevated, somewhat 

 turreted; apex acute; whorls 5^, convex; suture deep ; aperture ovate, slightly 

 contracted on the inner side ; distinguished from L. trnncatula in being larger, in 

 having the mouth more oval, while the whorls increase more regularly (K. and 

 B. B. W.). 



Dimevsions. — L. 10 — 12 mm. B. 5 — 6 mm. 



Distribution. — Not known living. 



Fossil : Butleyan Crag : Hollesley, Butley. Icenian : Bramerton, 

 Thorpe (Norfolk). 



Remarks. — As there seemed some doubt as to the identification of some fossils 



refei'red by Wood to the recent species L. Pingellii and L. Holhollii described by 



Moller, but, as far as I know, never figured, I asked Dr. Nordmann to send me 



some typical specimens of these two forms, which he was kind enough to do. It 



seemed improljable that freshwater shells unknown as fossils and at present 



living only in Greenland should have been denizens of the North Sea region in 



Pliocene times. Submitting the Recent specimens to Messrs. Kennard and B. B. 



Woodward, and comparing them with the Crag shells, we agreed that they were 



not identical. The one form has since been referred by them, as stated below, to 



the British species L. jxih.istris ; the other they describe as new, under the present 

 name. 



Limnaea palustris (Midler). 



1774. Bucciniim palustre, Miiller, Verm. terr. fiuv. Hist., pt. ii, p. 131, no. 326. 

 1848. Limniea palustris (?), S. V.Wood, Mon. Crag Moll., pt. i, p. 7, tab. 1, fig. 8. 

 1853. Limnxus palustris, Forbes and Hanley, Brit. Moll., vol. iv, p. 180, pi. cxxiv, fig. 2. 

 1862. Limniea palustris, Jeffreys, Brit. Concli., vol. i, p. 113, pi. vii, fig. 6. 

 1872. Limncea Pingellii (?), S. V. Wood, Mon. Crag Moll., 1st Suppl, p. 3, tab. iv, fig. 4. 

 1890. Limnsea labio, C. Keid, Plioc. Dep. Brit., p. 229. 



1897-1901. Limniea palustris, var., Kennard and B. B. Woodward, Essex Nat., vol. x, pp. 100 d se^- 

 1897 ; Proc. Malac. Soc, vol. iii, p. 196, 1899 ; Proc. Geol. Assoc, vol. xvii, pp. 218 et seq., 1901. 



Specific Gharocters. — See Mon. Crag Moll., pt. i, p. 7. 



