LIMN #/A. 39 
both in size and form. I have some of the Var. corvus, 
which I took in Essex, one and a half inches in length, 
of a dark purple colour—truly magnificent shells. 
Var. I. corvus. Larger, more tumid, dark purple. 
Var. IT. elongata. Spire more produced. 
| Var. III. tiéncta. Shorter and broader, mouth 
purplish. 
Var. IV. conica. Conical, whitish, suture deep, 
having an umbilical cleft. 
Var. V. roseo-labiata. With rose-coloured rib. 
Var. VI. decollata. Spire truncate. 
Var. VII. albida. White. 
7. Li. TRUNCATULA (somewhat truncated). 
Somewhat resembling L. palustris in shape, but turreted 
in appearance with deeper suture; rather glossy ; mouth 
ovate ; umbilical cleft distinct. 
This species is very liable to be confounded with 
some variety of the last, which in general form it 
somewhat resembles. It is, however, much smaller 
and more elegant in shape, with a much deeper suture, 
which gives it its turreted appearance, and more tumid 
whorls. 
It is common both in still and running water, espe- 
cially in shallow pools, which are often dried up in 
