182 The Hiftory of ANIMALS. 
black, conic Cochlea. 3. The leffer, olive-coloured Cochlea, with tranfverfe or ob¬ 
lique lines of brown. 4. The little, green and brown, obtufe-pointed Cochlea. 
TURBINES, SCRE W-S HELLS. 
Turho gracilior Icevis albefcens. 
The fmooth , fender , whitijh Turho . 
T HIS is a very elegant little fhell ; it’s length is more than an inch, and it’s 
thicknefs at the bottom not more than that of a goofe-quill: it grows regu¬ 
larly taper from this part to the fummit, where it terminates in a fharp point: it con- 
lifts of about fifteen volutions, which are flatted on the furface, and have no variega¬ 
tions, only the line that marks their feparation from one another is of a pale brown ; 
the fubftance of the fhell is very tender, and it’s colour a pale whitifh-grey 5 it’s mouth 
is fmall, and of the depreffed kind. 
I met with many thoufands of this fpecies together, about a clufter of flags in one 
of the lakes, on one of the hills in Lancafhire, which of them I do not diftin&ly re¬ 
member. I have fince received fpecimens of it from France, where it abounds in 
the Seine, and forne other rivers: the French fpecimens are whiter than ours, but no 
way elfe different. 
Turho ore ohlongo , margine volutionum denticulate. 
The long-mouthed Turho , with the edge of the volutions denticulated. 
This is a very elegant fpecies 5 it’s length is about three quarters of an inch ; it’s 
diameter at the bafe is about a third of an inch, and it’s whole ftrudture formed of 
about thirteen volutions: the mouth is oblong, narrow, and edged with a furrowed 
and irregular lip ; the volutions are flat, and their furface is fmooth, but the upper 
edge of each, or the continued edge of the whole, is deeply and elegantly denticulated : 
the colour of the whole fhell is a very pale grey, with fomewhat of a pearly tinge in 
it, but it is rarely quite pure on the furface. 
We have it in the river Nen near Peterborough, and in fome other of our large 
rivers, and fometimes in ponds. 
Turho margine volutionum hullato. 
The Turho , with the edge of the volutions hullated. 
This is a very elegant fpecies: it’s height is an inch; it’s diameter at the bafe at 
lead a third of an inch, and it’s mouth of an irregularly oblong figure: it’s fubftance 
is very thin and tender, and it’s colour a dead whitifh ; it is compofed of about feven 
volutions; they are broad, flat, and perfectly fmooth on the furface ; but at the verge, 
where the other fpecies has it’s denticulations, this has every-where a feries of little 
rounded protuberances or bulls, which give it an extreamly elegant figure. 
It is a very rare fpecies; I have met with it in fome of the rivers in Leicefterfhire 
and Yorkfhire, but not elfe where : it is frequent in the ditches in Holland, from 
whence I have received very beautiful fpecimens. 
Turho alhefeens volutionihus tumidis glahris. 
The whitifh Turho , with fmooth , tumid volutions. 
This is an inch and a half long, and of the thicknefs of a fwan’s quill at the bafe ; 
the mouth is of a roundifh figure, and the fummit obtufe : the fhell confifls of about 
fourteen volutions j they are all, except the four laft, very diftindt, and are rounded 
or bellied, and confequently have the line that feparates them much funk in below 
their furface: the whole is of a tender ftrudture, and a whitifh colour. 
I met with it laft fummer in Whitlefea-meer in Cambridgefhire, and have not 
feen it elfewhere. 
\Turbo 
