36 LIMN ZID&. 
parent, yellowish horn-colour; whorls five; spire raised ; 
apex sharp; mouth large, pear-shaped. 
This is the commonest and most variable of our 
freshwater shells, and is distributed over the whole of 
the British Isles. 
Like other water-snails, LZ. peregra is amphibious, 
and may be found crawling on mud and stones un- 
covered by the water. 
It is always worth the collector’s while to gather 
specimens from any and every place he visits, and 
carefully label them in separate trays in his collection. 
Not till this is done will he have any idea of the 
variability of this species. 
Var. I. Burnetti. Globular and solid, dull yellow- 
ish brown, strongly striated, last whorl nearly cover- 
ing the rest, spire very short and blunt. 
Var. II. lacustris. Somewhat resembling Var. L., 
but smaller and more glossy, with strong transverse 
gTOOVES. 
Var. III. lutea. Very solid, spire very short. 
Var. [V. ovata. Ampullaceous, thin, whorls very 
convex, spire short. 
Var. V. acuminata. Like the last, with more pro- 
duced spire. 
Var. VI. intermedia. Spire produced, mouth ex- 
panded. 
