aT PUATE V. 
It breaks from the egg perfeétly formed, but very minute and tranf- 
parent ; this is therefore the beft time to difcover its flru€ture, and 
from one in this flate we have taken our figure. 
By the antennz it direfts its courfe, as does the Monoculus Quadri- 
cornis ; and like it alfo it hath two eyes fixed in the fhell, but it can com- 
pletely envelope its head in its bivalve covering; its mouth is beneath, 
but the numerous filaments it darts forth, caufes fuch a violent motion 
in the water, that the minuter infeéts are unrefiftingly drawn between 
them, and forced to the mouth. 
The motion of its lungs is very vifible, as are alfo the veffe ramilf- 
fying thence. Its food%s carried:to, and digefted in the deep-coloured 
tube, or inteftine, and the refufe is difcharged = a fudden jerk from 
the extremity of the tube, or anus. 
Thus it exifts, a life of rapine and deftru€tion, enjoyed at the ex 
pence of the lives of thoufands; and as the objeéts of its ravenous dif. 
pofition are defencelefs, fo they are the fport of their conqueror: the 
- few moments of intermiffion its craving appetite grants them, is occu- 
pied equally in the fpoil, firft preffing them to death, and then tofling 
= undevoured into the fluid, 
But thould a more powerful infect phot him, he immediately con- 
traéts his parts, and nothing more than the external covering is open to 
his antagonift’s violence, and he will fooner die ignobly than offer the 
leaft oppofition. 
yo Ses ak 
This animalcule is very minute, and appears like a fine membrane 
without inteftines before the microfcope ; from the appearance of its 
winged fides, it is fuppofed to refemble a bird. It is called Burfaria 
Hirundinella. 
aan REEtiennmeensimensseneneeemmememmmamnel 
FIG, II, 
The back and fide view of an animaleule found in ditch-water on, 
duck-weed, very pellucid, and fingularly marked in the. inteftines ; 
tail moveable, and thereby it direéts its courfe, 
PLATE 
