The Hiftory ^ANIMALS* 
179 
Patella elliptica vertice perforator 
c The elliptic Patella , with a perforated top . 
This is about a quarter of an inch in diameter, and about half it’s diameter in 
height: it is of an oblong figure, rounded at both ends, and of a dufky brown co¬ 
lour : the (hell is very thin, and is eafily crufhed to pieces ; it’s verge is even, and it’s 
fummit is naturally perforated 3 the aperture is fmall, but it is of an oblong figure, and 
feems as if formed of two round holes, which had broke their way into one another. 
We have this fpecies about London; the ditches in Tuttle-fields afford it in con- 
fiderable plenty. 
The other fpecies of frefh-water Limpets are, 1. The conic, radiated, yellowifh- 
brown Patella. 2. The depreffed, deep brown Patella. 3. The low Patella, with 
the umbo near one edge. 4. The little, gibbofe, pale brown Patella. 
COCHLEA SNAILS. 
Cochlea fpiralis clavicula parum elevata , ore rotundo. 
The fpiral Snail , with the clavicle a little elevated\ and with a round 
mouth . 
/~ir^ HIS is a very pretty fhell; it’s figure is roundifh, it’s diameter three quarters 
jp of an inch : it’s fhell is confiderably firm and folid, and is fmooth on the fur- 
face ; it is formed of about four volutions, and the clavicle in the center is elevated 
above the reft of the furface : the colour is a greyifh-white, and the outer or larger 
volution has a ftreak of black running all along it in the courfe of the fpiral, but it 
lofes itfelf, as it gets into the next volution: the mouth is round, and the lip edged 
with a rim confiderably thicker than the reft of the fhell, and of a brighter white $ 
this is a rare fhell. 
I have met with it in the lakes upon the hills, in the North of England. 
Cochlea fpiralis clavicula deprejfa, ore etiam deprejfo. 
The fpiral Cochlea , with a depreffed clavicle 3 and de¬ 
preffed mouth . 
This is alfb a pretty fhell, it is of the fpiral, flatted kind ; it’s contour is round, and 
it’s diameter about half an inch : the fhell is firm and folid, and the colour a fine 
glofly brown, with a tinge of the olive : it confifts of two or there volutions 3 the cla¬ 
vicle is depreffed in the center, and the mouth is, in part, filled up by the next volution 
of the fhell: the lip is only a narrow rim or fillet, thicker, and of a paler colour than 
the reft of the fhell. 
We have this fpecies in great plenty in our brooks and rivers 3 the ditches about 
London abound with it. 
: ; . - /. ; : ' ..'/V ' —\V' : 
Cochlea elatior clavicula longiore , ore femirotundo . 
The taller Cochlea , with a long clavicle y and a half-round mouth . 
This is one of the moft elegant and beautiful of the frefh-water Cochleae : it is about 
an inch high, and three quarters of an inch in diameter in the body 3 the mouth is of 
the half-round kind, being in part filled up by the fucceeding volution of the fhell 
entering it: it is furrounded with a thin rim, of a pale yellowifh colour; the body of 
the fhell is rounded and fmooth; the clavicle has four volutions, and terminates in a 
point: the ground colour of the whole fhell is a dufky yellow, and this is elegantly 
variegated with an olive brown, difpofed in irregular fpots and clouds. 
We have this fpecies in the river Nen, near Peterborough, and in fome other of our 
deep and not very rapid waters, but it is not common; the colour is fometimes Amply 
a pale yellow, but this is an accidental variety. 
