a 6 The Hijlory of ANIMALS* 
Taenia teres. 
The round-bodied Taenia . 
This grows to two inches long, though it is more ufually met with of about half 
an inch or three quarters. It’s body is compofed of a number of articulations, and is 
rounded and pellucid 3 the fkin is extreamly thin and whitifh. 
It is common in the mud of ponds and ditches: I have met with millions of them 
in the ponds in the ifland in the Park this fummer. 
S I C Y A N I A. 
T H E Sicyania is an Infeft of an oblong form, flat on the belly, and rounded 
on the back3 it’s fkin foft, and it’s mouth large, horizontal, and emarginated, 
or dented in the middle. 
Of this genus there is but one known fpecies. 
Sicyania. %\}£ dgOtttD-tbOJtm. 
This grows to two thirds of an inch in length, though it is more ufually met with 
of not half that flze : it’s breadth is nearly equal to two thirds of it’s length ; it’s fkin 
is foft and whitifh, with a tinge of brown 3 it is flattifb, but fomewhat rounded on 
the back, and has about eight deep longitudinal furrows in two feries. The hinder 
part of it’s body is rounded, and the other extremity lhews a large mouth 5 it fome¬ 
what refembles the feed of the common gourd in figure, whence it has been called, by 
the medical writers. Vermis Cucurbitinus. 
It is found fometimes in the inteflines, and often in the fubflance of the other vif- 
cera, in quadrupeds. 
H I R U D O. 
T H E body of the Hirudo is flatted, but not jointed 3 and is broader at either 
end than elfewhere : the fkin is foft and glofly. 
Hirudo nigrefcens flavo variegata. 
The blackijh Hirudo, variegated with yellow . 
%fft common 
This grows to the length of two or three inches3 it’s fkin is fmooth, of a blackifh 
colour, and edged with a yellow line on each fide : it has alfo fome fpots of yellowifh 
on the back3 but both thefe and the lines grow faint, and almofl difappear, at fome 
feafons. The head is fmaller than the tail, which fixes itfelf very firmly to any thing 
the creature pleafes. It is viviparous, and produces but one young one at a time, which 
is in the month of July. 
This is the fpecies ufually employed to draw blood 3 authors call it Hirudo vul¬ 
garis, and Sanguifuga. It is common in fhallow waters. 
Hirudo nigra abdomine plumbeo . 
The black Hirudo , with a lead-coloured belly . 
%l)e J|o?fc- 
ieerf). 
This is larger than the former fpecies : it’s fkin is fmooth and glofly ; it’s colour, on 
the back, black, but with a number of pale greyifb fpots: the belly is of the colour 
of thefe fpots, with a tinge of bluifh. 
It is common in fhallow ponds. 
Hirudo lateribus attenuatis . 
The thin-fded Hirudo . 
%l)t 
, This grows to about an inch in length : it is very flat 3 it’s fkin fmooth and glofly, 
and it’s colour whitifh : it’s back is very little elevated, and it’s fides thin, and as it 
were edged. 
It 
