142 PALUDINIDA. 
This species is far more local and less abundant than the 
last; it is found in similar situations. It occurs in many 
parts of England and Wales but not in Ireland, and only 
locally in Scotland. As it is only about half the size of 
B. tentaculata, adult specimens cannot be mistaken ; but 
to avoid confusion with the young of that species the 
following table may be useful. 
B. TENTACULATA. . B. LEAcsar, 
_ Whorls much more convex, 
| suture much deeper. 
Umbilicus practically none. | Umbilicus distinct. 
Mouth obliquely oval and | Mouth almost circular, very 
sharply angulated above. slightly angulated. 
It may be noticed that B. fextaculata bears the same 
relation in its distinctive characteristics to B. Zeachit that 
V. vivipara does to V. contecta. 
Var. I. elongéta (Jeff-). Spire elongated. 
Var. II. é/bida (Rimmer). White. 
Genus.—PALUDESTRINA D’Orbigny. 
[=*Hyprosia Hartman}. 
Eyes placed on tubercles ; ofercadum horny and thin, paucispiral. 
1. P. SiMILIS (vesembling another species) Draparnaud. P).VIII., f. 11 
Sub-conical, thin, semi-transparent, yellowish horn-colour; zhor/s 
5—6, rounded; suture deep; mouth oval; opercilum thin; wnebilicus 
small. A. 34mm. B. 24 mm. 
*The authorities do not consider this a freshwater genus, but as one species at 
least lives and breeds in pure freshwater, and nearly all L. and F. water collectors 
are more or less interested in it, I have included it. 
