BITHINIA. 
27 
Bithynia Leachii. Leach^ Syn, Moll. 209 ; Forbes and 
Hanley, B. M. iii. 16. t. 71. f. 78. t. H.H. f. 1. — Paludina 
Troclielliana. Philippe. — Paludina Kickxii. Vestend^ Bull. 
Acad. Brux. 1835, 375. — Paludina decipiens. Mich. Mag. 
Zool. 1843, 2. t. 64. f. 2. — Paludina Michaudi. Duv. in 
Rev. Geol. 1845, 211. — Bithinia Kickxii and B. Michaudi. 
Dvpuy., Moll. — Paludina acuta, Fleming. Br. Anim. 315. — 
Cyclostoma simile. Drop. 31. t. 4. f. 15. (?) — Paludina 
ventricosa. Leach.^ MSS.;' Sheppard., Brown., Brit. 
Shells., t. 41. f. 74, 75. — Paludina hurnilis. N. Bouhee., Cat. 
— Paludina similis. Tiirton., Man. 135. f. 121. Alder., Mag. 
Zool. and Bot. ii. 116. 
In ditches and canals ; often even where the 
water is slightly brackish ; south of England. ( Gray^ 
1821.) 
Shell a quarter of an inch long, and two lines 
broad, with four or five very tumid volutions ; aper- 
ture dilated, nearly circular, projecting more out- 
wardly, or out of the line of the columnar axis, with 
a small umbilicus behind itc 
The fry, or mass of egg, of this species, are dis- 
posed on a tough strap-shaped green membrane, in a 
double row, consisting of six or seven pairs placed 
opposite to each other ; and this elongated receptacle 
is fixed to the under surface of aquatic plants. 
Mr. Sheppard received it from Dr. Leach, under 
my name, but he changed it to Turbo Leachii. I 
do not think it is (7. simile of Draparnaud : in Dr. 
Turton’s figure the volutions are scarcely sufficiently 
ventricose. 
The shell is often covered with a ferruginous in- 
crustation, and the apex of the spire is sometimes 
eroded. 
Mr. Alder observes {Mag. Zool. and Bot. ii. 116.), 
The Paludina viridis of Turton’s Manual (ed. 1. 
