of British MoUusca. 337 



248. Cionella luhrica (Mull.). 



Subgenus Azeca, Leach. 



249. Cionella tridens (Pultency). 



For notes on this species see Taylor, ' Journal of Con- 

 chology,' vol. ii. |3. 220. A reversed monstrosity has been 

 found by Mr. J. Emmet, of Boston Spa. 



Genus 2. CiECiLiANELLA, Ferussac. 



250. CcBcilianella acicula (Muller). 



Fam. 6. Succineidae. 

 Genus Succinea, Draparnaud. 



251. Succtnea 2Jutris (Linn.). 



252. Succinea elegans, Risso. 



Westerlund separates S. elegans and S. Pfeifferi^ Rossm., 

 and gives seven named varieties of the former and seventeen 

 of the latter. I cannot myself, after an examination of twelve 

 of these named varieties, find any points which seem to me to 

 constitute specific characters between these most variable 

 shells, and therefore 1 follow Jeffreys in using the earlier 

 name. 



253. Succinea stagnalis, Gassies. 



Succinea putris, \av. vitrea, Jeffreys, Brit. Concli. vol. i. (1872), p, 152. 

 Succinea viresceiis, Jefiveya, Ann. & Mag. Niit. Hist. ser. 5, vol. ii. 



(1878), p. 378 (nee S. viresccm, Morelet, Jide Baudon). 

 Succinea staynalis, Gassies, Malac. Ten\ et d'Eau douce do la rdg. int. 



litt. de I'Aquitaine, p. 14, fig. 2. 

 Succijiea stagnalis, Baudon, Deuxieme Suppl6iuent a la Men. dea 



Succinics Fran^aises (1879), p. 1, pi. xi. figs. 1-3. 



Jeffreys gives the following localities : — Carmarthenshire, 

 Grassmere, and St. Albans (/. G. e/.), Cork [Hum.'ph'eys) ^ 

 Mitcham, in Surrey [Henry Groves). 



The Succineoi are most difficult to distinguish and the forms 

 run into each other, so that I am myself disposed to hold that 

 we have but two species, S. iJutris and S. ohlonga. Succinea 

 stagnalis affords a good illustration of confusion. Jeffreys first 

 referred it to S.putris as var. vitrea (I suppose taking that name 

 from Moquin-Tandon) ; then receiving from Baudon the shell 

 described by him as >S^. dehilis, said that his shell was the same, 

 but that it was not S. dehilis (Morelet, MS.) C. Pfeiffer, the 



