1 66 Mr , Lightfoot’s Account cf 
It was found in the bottom of a fpfing of clear water, ad-, 
hering to the under fide of rotten leaves, near Bullftrode, in 
Buckitighamfhire, in the month of April. It has alio been 
found in fome other clear waters in the fame neighbourhood. 
o * 
but not common. 
A third (hell I have to mention is a very minute but curious 
Helix of a fubconical form, confiding of about five convex 
wreaths, gradually diminifhing towards the apex. The fhell 
is umbilicated at the bafe, and the wreaths are tranfverfeiy fur- 
rounded- with numerous (harp-edged rings, which are produced 
in the middle or back of each wreath into a kind of fpur, 
formed of comprefied and very tender fpines. The mouth is 
a fegment larger than a femicircle, but not round enough to 
conftitute the (hell a Turbo, to which it is neverthelefs nearly 
allied. The colour of the whole (hell is brown. 
It may be named, 
Helix ( fpinulojd ) tefta fubconica umbilicata, anfradlibus 
5 convexis, annulis membranaceis acutis cindtis, dorfo 
fpinulofo-carinatis, apertura fuborbiculari. 
Tender prickly Helix. 
The figures here given reprefent this (hell in different pofi- 
tions, in its natural and magnified (late. 
Fig. i. 2. (Tab. II.) The (hell, in different pofitions, of the 
natural fize. 
3. 4. 5. The fame magnified. 
I know no author who has hitherto noticed it. 
It was found near Bullftrode, at the foot of pales, upon old 
bricks and (tones, after rainy weather, in June and July. 
