LIMN^A AURICULARIA. 31 



more than half the total leiigtli, turreted ; apex rather acute ; Avhorls 4|-, somewhat 

 swollen ; suture deep ; aperture ovate, slightly contracted on the inner side ; 

 umbilicus nearly closed ; body-whorl striated parallel with the aperture. (K. and 

 B. B. W.). 



Dimensions. — L. 6 mm. B. 4 mm. 



Didribution. — Not known living-. 



Fossil: Butleyan Crag" : Butley. Icenian : Bramerton. 



Remarks. — This is another of the Crag Limnaeas referred by Wood to L. 

 triincafida that Messrs. Kennard and B. B. Woodward consider worthy of specific 

 rank. They distinguish it from L. huflei/ensis by its much smaller size, shorter 

 spire, and relatively larger body-whorl. They know of only one specimen, from 

 Butley, which they can identify with that given by Wood in 1848 ; they do not 

 admit that L. trimcatula has been reported from the Crag. 



Limnaea auricularia (LinneJ, var. acuta, JefPreys. 



1758. Helix auricularia, Linne, Syst. Nat., ed. x, p. 774, uo. 617. 



1833. Limnaius acutus, Jeffreys, Trans. Liuu. Soc, vol. xvi, p. 373. 



1853. Limneeus auricularius , var. acuta, Forbes and Hanley, Brit. Moll., vol. iv, p. 171, pi. cxxiii, 



fig. 2. 

 1862. Liinneea auricularia, var. acuta, Jeffreys, Brit. Conch , vol. i, p. 109. 



1879. Limnsea auricularia, var. acuta, S. V. Wood, Mon. Crag Moll., 2nd Suppl., p. 36, tab. iv, fig. Sa. 

 1899. Limnsea auricularia, var. acuta, Kennard and B. B. Woodward, Proc. Malac. Soc, vol. iii, 



p. 195. 



Varietal Characters. — Shell smaller than the typical form and more oblong, the 

 body whorl and mouth being narrower in proportion. 



Dimensions. — L. 15 mm. B. 10 mm. 



Distribution. — Recent: widely distributed in Great Britain and Ireland; 

 recorded also from France, Holland, and elsewhere (J. W. Taylor). 

 Fossil : Icenian Crao- : Bramerton. 



Middle Pleistocene: near Potsdam. 



Remarks. — The typical form of L. auricularia is a widely diffused species both 

 as a Recent shell and in our Pleistocene and Holocene deposits ; it has not been 

 reported, however, from the English Crag or the Cromer beds. The var. acuta, 

 that figured by Wood, is represented in our Pliocene deposits by a single specimen 

 from Bramerton, now in the Norwich Museum. 



