268 



Kew : Lincolnshire Non-Marine Mollusca. 



CYRENID^. 



x 137. Sphserium corneum (Linn.). [Sphagnum corneum.] 

 x 138. Sphserium rivicola (Leach). [Sphaerium rivicola.] 

 139. Sphaerium pallidum Gray. [Sphaerium ovale.] 



x 140. Sphserium lacustre (Mull.).. [Sphaerium lacustre.] 

 x 141. Pisidium amnicum (Mull.). [Pisidium amnicum.] 

 x 142. Pisidium fontinale (Drap.). [Pisidium fontinale.] 

 x 143. Pisidium henslowanum (Shepp.). 



[Pisidium fontinale var. Henslowana. ] 



144. Pisidium pulchellum Jenyns. 



[Pisidium fontinale var. pulchella. ] 



145. Pisidium cinereum Aid. 



[Pisidium fontinale var. cinerea.] 

 x 146. Pisidium pusillum (Gmel.). [Pisidium pusillum.J 

 x 147. Pisidium obtusale (Lam.). 



[Pisidium pusillum var. obtusalis.J 

 x 148. Pisidium nitidum Jenyns. [Pisidium nitidum.] 



x 149. Pisidium milium Held. [Pisidium roseum. ] 



S. Specimens obligingly examined by Mr. Edgar A. Smith, 

 of the British Museum. A. Marked on the authority of Mr. 

 L. E. Adams, ' The Collector's Manual of British Land and 

 Freshwater Shells,' ed. 2, 1896, p. 102. F. On the authority 

 of Mr. F. W. Fierke, 'The Naturalist,' 1893, p. 312. P. On 

 the authority of the Rev. E. A. Woodruffe Peacock, ' The 

 Naturalist,' 1901, p. 355. W. On the authority of Mr. W. M. 

 Webb, 'Journal of Malacology,' VI. (1897), p. 26. 



BIBLIOGRAPHY. 

 The writer ventures to append a short Bibliography indi- 

 cating the two principal papers on Lincolnshire Non-Marine 

 Mollusca (those of Mr. Ball and Mr. Roebuck), and the pub- 

 lished records of the finding of additional species from time to 

 time. 



(1) Ball, Thomas. 'Land-Shells of Lincolnshire.' [A list of 67 land and 

 freshwater mollusca (with a mention of unidentified Pisidid) taken 

 in the northern part of the county, principally in the neighbourhood 

 of Brigg ; and including, among' freshwater shells Dreissena poly- 

 morpha {= Dreissensia polymorpha), Cyclas rivicola ( = Sphceriinn 

 rivicola) ; among land shells Helix cantiana { — He lice 11 a canfiana), 

 Achatina acicula ( = Ciecilioides aciciila); together with the semi- 

 terrestrial Conovuli/s myosolis { — Alexia dentindaia v. myosotis), 



Naturalist, 



