Sylla qiioque infellx tali languore perefus 

 *^ Corruit, et foedo fe vidit ab agmine vinci." 



Great Sylla too the fatal fcourge hath known ; 

 Slain by a hoft far mightier than his own ! 



The Loufe does not, like the flea, undergo a 

 change of form, but is hatched from the egg com- 

 plete in all its parts, and differing only from the pa- 

 rent infeft in its fmaller fize. Such diminutive fpe- 

 cimens are far preferable for microfcopical exami- 

 nation to the full-grown ones, being much more 

 tranfparent, and fhewing in a more elegant manner , 

 the difpolition of the mufcles, vifcera, &c. 



When examined by the microfcope the principal 

 appearances are as follow: viz. the trunk or pro- 

 bofcis, which is generally concealed in its fheath or 

 tube, is of a very fharp form, and is furnifhed to- 

 wards its upper part with a few reverfed aculei or 

 prickles. The eyes are fmooth, large, and black. 

 The ftomach and inteftines, which poflefs the greater 

 part of the abdominal cavity, afford an extremely 

 diftin^fl and curious view of the periftaltic motion,* 

 The ramifications of the trachea, or refpiratory tube, 

 appear difperfed in a moft beautiful manner through- 

 out various parts of the animal, and are particularly 

 obfervable towards their orifices on the fides of the 

 abdomen. The legs are each terminated by a double 

 claw, not greatly unlike that of a lobfter, but of a 

 much fliarper form. The whole animal is every 

 v/here covered by a ftrong and granulated Ikin. 



To 



