The Hijlory ^/ANIMALS. i8x 
that they are feldom diftinguifhed j the mouth is narrow, and the lips are of a paler 
red than the reft of the (hell, and are fmooth: the clavicle is fhort, and turns only 
about twice near one edge, at the imaller end of the fhell. 
We have it in the rivers in Northamptonfhire in abundance* 
Cochlea conica ., ore deprejfo , grifea. gte& 
The grey , conic Cochlea , with a deprejfed mouth . XbfttC? 
This is a fmall fpecies, but is exa&ly like the large conic Cochleae, or, as they are 
ufually called, Trochi, in figure ; it is of a tolerably regular conic fhape, and has four 
volutions j it’s height is about a third of an inch, it’s diameter nearly as much at the 
bafe, and it terminates in an obtufe, little umbo : it’s colour is a pale grey, often ap¬ 
proaching to whitifhj it’s fubftance very thin and tender: it’s mouth is moderately 
large, and of a deprefled form, or in great part filled up with the fucceeding volution 
of the fhell. . 
We have it in feveral of our large rivers 5 I have received very fair fpecimens of it 
from the Avon, and have met with it in the Thames about Richmond. 
Cochlea conica ore deprejfo coflata et variegata. 
The cojlated and variegated conic Cochlea , with a deprejfed mouth . 
This is a fmall, but an elegant, {hell; it’s height is, at the utmoft, not more than 
half an inch ; it’s diameter, at the bafe is more than a third of an inch j it’s mouth not 
fo large as in the former fpecies, and it’s fummit pointed : it is of a very regularly co¬ 
nic figure, and confifts of five volutions 3 it is of a fomewhat firmer fubftance than 
the former fpecies, bat is ftill eafily crufhed : it has a rifing in form of a rib, of a round¬ 
ed figure in the middle of the firft or loweft volution, which follows the whole turn 
of the fhell, but grows fainter, as it approaches nearer the top : the ground colour is 
a faint grey ; and the variegations, which are difpofed in the form of clouds and lines 
of an irregular form, are black. 
We have this fpecies in plenty in the North, in our deep rivers; elfewhere I have 
not met with it: it often is found on the ftalks of the water-lilies. 
Cochlea conica fufea. 
The brown , conic Cochlea. 
This is a very fmall fhell, and has no great beauty : it’s height is hardly a quarter of 
an inch ; it’s diameter at the bafe is not more than a fixth of an inch, and it’s colour 
is a pale brown, with fome faint caft of yeliowifh, and without any variegations: the 
fhell confifts of. four volutions, and thefe are rounded and fmooth on the furface; the 
top is obtufe, or terminated by a kind of urnbo : the fubftance is extreamly thin and 
tender, fo that the leaft touch deftroys it. 
It is frequent in our ditches, where no other fpecies of the conic kind is found : we 
have it in abundance in the ponds and ditches in Tothil-fields, and about Batterfea and 
Wandfor. \\ 
The other of the ffefti-water Cochleae are numerous. 
1. Of the deprefled kind we have, 1. The brown, ftriated Cochlea, with the cla¬ 
vicle a little railed. 2. The elegant, brown, and yellow Cochlea. 3. The larger, 
pale, olive-coloured, deprefled Cochlea, with a larger mouth. 4. The larger, grey 
and black, deprefled Cochlea, with a white, thin lip. 5. The lefler, firm, greenifh, 
deprefled Cochlea. 6. The leffer, thick, yeliowifh, deprefled Cochlea, with few vo¬ 
lutions. 7. The lefler, deep brown, deprefled Cochlea, with a great mouth. 
2. Of the ventricofe or bellied kinds, with a half-round mouth and exerted clavicle, 
there are, 1. The large, brown and yellow, elegantly variegated Cochlea. 2. The 
little, thick, deep brown Cochlea, with a large mouth. 3. The thin, fmall, olive- 
coloured Cochlea. 4. The greenifh, oval-bodied Cochlea. 5. The elegant, pearly 
white Cochlea. 6. The variegated, brown and grey Cochlea. 7. The very fmall, 
grey Cochlea, lineated with black. 
3. Of the conic Cochleae, called Trochi, befide the already deferibed fpecies, there 
are, 1. The large, plane, brown, fharp-pointed Cochlea. 2. The large grey, and 
A a a black. 
