356 EXPLANATION OF THE PLATES. 



natural size.— «, The anterior part of the head, where the 

 tube is seen naked. — 6, The neck. 



Fig. VII. Head of an unarmed (lata) taenia, hardened by Bon- 

 net in spirit of wine, in which it remained three years ; this 

 is a magnified view. — F, The head. — b b, Tube of the probos- 

 cis. Bonnet supposed this dark line to be the mark of union 

 of the lips of its mouth. 



Fig. VIII. Anterior part of the head of a human armed (cucurbi- 

 tina) taenia, observed with the microscope, — abed, The four 

 lateral canals, opening in a square; they traverse the whole 

 length of the worm. They are also called papillae , small 

 mouths, and stigmata. — ef, A crown, in form «>f small crotch- 

 ets or hooks, circular and stellated, in the centre of which is 

 situated the tube. 



Fig. IX. a r, The head of a human unarmed (lata) taenia, seen 

 through a single lens, having about it whitish ^himentsffffff 



If' 



Fig. X. Three long rings of a large armed (cucurbitina) taenia, 

 situated immediately after the neck, at the beginning of the 

 body. — a b c, Lateral alternate papillae. 



Fig. XI. Three rings of a large armed (cucurbitina) taenia, ta- 

 ken from the widest part of the body. — a b c, Lateral papil- 

 lae. — d e, The longitudinal central canal, corresponding with 

 the longitudinal groove, which is also observed in the broad 

 taenia (taenia lata), as in fig. V, c c ccc. This canal is 

 commonly called the middle canal, and begins wijth the tube. 



Fig. XII. Pieces of a broad taenia, in which we see a knotty 

 line or stroke extending through the body. Its exterior form 

 is not constant. According to Bonnet it sometimes resem- 

 bles a blue or purple tliread, as in this fig. rrr. 



Fig. XIII. The knotty line rrr, of fig. XII, which, examined 

 with the mictoscope, is an assemblage of ovaries, (considered 

 by Bonnet us a glandular body,) in form of a flower c c. 



Fig. XIV. ggg, Three clusters of ovaries, shown in fig, XIII, 

 and seen through a larger lens. 



Fig. XV. One of these clusters of ovaries insulated and seen 

 through the microscope. 



