48 
This genus, which seems perfectly natural, is adopted by 
Mr Gray from Mountfort; and is to be regarded as a n 
amendment of the system of Lamark. 
Z. ROTUND ATUS. Helix Radiata. Mont. Test. BrU'* 
vol. 2, p. 432. H. Rotundata. Flem. Brit. An., p. 263- 
Z. R. Gray’s Turt. p. 163, pi. 5, fig. 44. Common. 
Z. CELLARIUS. H. Nitens. Turt. Lin. H. Lucid®* 
Mont. Test. Brit., vol. 2, p. 425. Z. C. Gray’s Turt- 
p. 170, pi. 4, fig. 40. , pS 
Montagu gives the following account of what he suppose 
to have been a variety of this species. Those found * 
Newbury on peat were dark, and never exceed a quarts 
of an inch in breadth. “ That found under water *» 
crawling upon Brooklime, and was considerably larger ; ' 
was in a water course, or drain to a swamp, near Penza*: 
in Cornwall. These however appear from their shape to » 
the same, but whether they are really distinct from in 
Lncida (Z. C.) or only varieties, the observations of futj>' 
Conchologists must determine. We do not recollect whetu s 
the animal we found under water was of the true aquau 
kind, or whether it possessed four retractile tentacula, av 
had by accident fallen into that element; but we net 
before or since, found one so large, so extremely thin a” 
pellucid, or of so light a colour. 
* Z. CRYSTALLINUS. Gray’s Turt., p. 170, pi. 4, fig- 4> 
Not common. 
Z. ALLIARIUS. Gray’s Turt., p. 168, pi. 4, fig. 
Scarcely common. 
SUCCINEA. 
GENERIC CHARACTER: The shell oval, oblong, tb«®> 
with a short conical spire and rapidly enlarging whof 
ending in a large, longitudinal, oblique month, with __ 
peristome disunited behind ; pillar smooth, with an imp*-' 
forated axis. . . , , 
The genus is known from Helix and Zomtes by Us obi*® 
shape, and from Limnmus by there being no mark of an obliq 
fold on the pillar. 
* S. PFEIFFERI. Gray’s Turt. p. 178, pi. 6, fig* '. ' 
Scarcely rare. I found some specimens in a small o r " 
ping stream, among multitudes of Liinnaeus Pereger. , 
S. PUTRIS. Helix. P. Turt. Lin. Mont. Test. Brit- * ' 
2, p. 376. S. P. Flem. Brit. An., p. 276. Gray’s Tu 
p. 178 pi. 6, fig. 73. 1 entertain little doubt of its be 
Cornish, but I do not find it within the sphere ot 
research. 
BULIMUS. A 
GENERIC CHARACTER: The shell oblong or turret^ 
the spire ending rather acutely, with the last volution l ar ® 
