of British Mottusca. 337 
248. Cionella lubrica (Mull.). 
Subgenus Azeca, Leach. 
249. Cionella tridens (Pulteney). 
For notes on this species see Taylor, c Journal of Con- 
chology,’ yoI. ii. p. 220. A reversed monstrosity has been 
found by Mr. J. Emmet, of Boston Spa. 
Genus 2. Cascilianella, Fdrussac. 
250. Ccecilianella acicula (Muller). 
Fam. 6. Succineidse. 
Genus SUCCINEA, Draparnaud. 
251. Succinea putris (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, y ai*. vitrea , Jeffreys, Brit. Conch, vol. i. (1872), p. 152. 
Succinea virescens , Jeffreys, Ann. & Mag. Nat. Hist. ser. 5, vol. ii. 
(1878), p. 378 (nec S. virescens , Morelet, fide Baudon). 
Succinea stagnates, Gassies, Malac. Terr, et d’Eau douce de la r^g.lnt. 
litt. de r Aquitaine, p. 14, fig. 2. 
Succinea stagnates , Baudon, Deuxieme Supplement a la Mon. des 
Succinees Francises (1879), p. 1, pi. xi. figs. 1-3. 
Jeffreys gives the following localities : — Carmarthenshire, 
Grassmere, and St. Albans [J. G. J.) y Cork (Humphreys) , 
Mitcham, in Surrey (Henry Groves). 
The Succinece 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. putris and S. oblonga. 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. debilis , said that his shell was the same, 
but that it was not S. debilis (Morelet, MS.) C. Pfeiffer, the 
