ACCOUNT OF THE FASCIOLA TRACHEA. I97 



of so fatal a disorder in an animal so profitable to 

 man, is a matter of no small importance ; for 

 without a knowledge of the cause, no remedy 

 can be applied upon physical reasoning. Hence, 

 the great advantage of physiological inquiry, in 

 enabling us to trace the distemper of a useful 

 animal to its origin, and to solicit the aid of the 

 learned in physic. 



The fasciola which occasions this fatal disease, 

 is, as far as I have been able to ascertain, a non- 

 descript species, differing from all others hitherto 

 described, by the great extension of the peduncle 

 or arm that supports the lower foramen. The 

 following is a description of this animal. 



CI. Vermes. — Ord. Intestina. 



FASCIOLA TRACHEA. 

 Pl. VII. Fig. 4. (Magnified four times.) 



Body round, acuminated at the posterior end, 

 the lower aperture produced on a long stalk 

 or arm, that extends rather beyond the an- 

 terior end of the body, where the other aper- 

 ture is placed, and is not above half the size 

 of that part : these openings spread a little, 

 or are subinfundibuliform ; the larger ap- 

 pears to be the mouth, and is slightly sexpar- 

 tite ; that on the arm is used as a sucker, 

 and is the part by which it adheres to the in- 

 side of the trachea : the divarication takes 

 place at about one-fifth part of the length of 



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