2 P L A T E V. 



By the antennae it directs its courfe, as does the Monoculus S$uadri~ 

 cornh -, and like it alfo it hath two eyes fixed in the fhell, but it can com- 

 pletely envelop 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 infects are unrefiftingly drawn between 

 them, and forced to the mouth. 



The motion of its lungs is very vifible, as are alfo the vefTels rami- 

 fying thence. Its food is carried to, and digefted in the deep-coloured 

 tube, or interline, and the refufe is difcharged by a fudden jerk from 

 the extremity of the tube, or anus. 



Thus it exifts, a life of rapine and deftruction, enjoyed at the ex- 

 pence of the lives of thoufands; and as the objects of its ravenous dif- 

 pofition are defencelefs, fo are they the fport of their conqueror : the 

 few moments of intermifiion its craving appetite grants them, is occu- 

 pied equally in the fpoil, firft prefling them to death, and then tolling 

 them undevoured into the fluid. 



But mould a more powerful infect oppofe him, he immediately con- 

 tracts 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. * 



F I G. II. 



This animalcule is very minute, and appears like a fine membrane 

 without interlines before the microfcope ; from the appearance of its 

 winged fides, it is fuppofed to refemble a bird. It is called Bur/aria 

 Hirundinella. 



F I G. III. 



The back and fide view of an animalcule found in ditch-water on 

 duck-weed, very pellucid, and Angularly marked in the inteftines ; 

 tail moveable, and thereby it directs its courfe. 



