EXPLANATION OF THE PLATES. 



PLATE FIRST. 



Fig. I. The head, neck and commencement of the part less ad- 

 vanced in age of a human armed taenia, (cucurbitina.) — c, The 

 head furnished witli crotchets or fangs. — 6, Protuberances of 

 the head in form of crotchets — a c c, Length and gradual 

 enlargement of the neck — c rf, The neck of the taenia grad- 

 ually becoming the body. The less complete rings of the 

 neck become broader and longer in proportion as they approx- 

 imate a d. 



Fig. II. The body of a human armed taenia, (cucurbitina,) not 

 yet developed, but of the same species as that of Fig. Ill, 

 though the rings are narrower and without visible alternate 

 papillae. 



Fig. III. Pieces of a middling armed taenia, (cucurbitina,) twen- 

 ty five metres one liundred and fifty decimetres long.— • 

 aaaaaa, Lateral papillae of one side. — b bb b b b. Lateral 

 papillae of the other side, as they are both alternately dispos- 

 ed. — c c, A double knot found in the body of the taenia. 



Fig. IV. A human taenia unarmed (broad) of Marx. — «, Head 

 without arms. — a b. Its neck. — c c cc, Single knots. — d dy Dou- 

 ble knots. — ^, Rings longer and broader than are found in the 

 body of this taenia. 



Fig. V. An unarmed (broad) human taenia of Bonnet.'— -A.^ The 

 head without arms. — A B, The neck — B C, The narrowest 

 part of the body — C D, The broadest part of the body, con- 

 tinuing to the end.— c c cc c, A longitudinal groove or de- 

 pression parallel to the length of the worm, and perfectly vis- 

 ible in these points. — ?n j«, Small perforated papillae that are 

 observed on the surface of the rings. 



Fig. VI. Another head of an armed (cucurbitina) taenia, of the 



