S58 EXPLANATION OF THE PATES. 



Fi(j. VIII. A cluster of vesicular worms, which, connected with 

 another like it, was found in the two lateral ventricles of the 

 human hrain. Its form resembles that of a small bunch or 

 cluster. In each ventricle, ti. is assemblage of worms was pa- 

 rallel with the plexus choroides, as exlnifited in pi. III. — n aa^ 

 Tlie petiole or stem of tlie vesicular verminous cluster. — b b. 

 Little bladders or A'esicles, wiiich constitute the vesicular 

 human worms (hermits) attached to and pendent froiii the 

 petiole. — c c, Vesicular worms that are smaller and almost 

 imperceptible to the naked eye. 



Fig. IX. A human vesicular worm, (hermit) enlarged by the mi- 

 croscope. — a, The head, similar to tiiat represented, pi. I, 

 jBg. VI. — a b, The neck. — b c, The bladder, or rstlier the bo- 

 dy of the worm, the outer membrane of which has been re- 

 moved in order to raise its circular fibres. 



Fig. X. A bladder taken from the medullary substance of a 

 sheep's brain ; on its internal surface are seen different small 

 white clusters, united togetlier, wl)ich are so many families of 

 the social vesicular worms. They are represented here of 

 the natural bigness. — a h cd e^ Five separate families. 



Fig. XI. Another similar bladder of the natural size, in which 

 the abovenamed worms are in part detached and artificially 

 distended — a y c r/ 1;/, Social vesicular worms distended.-— 

 gS^s^r Points where they are attached to the family or mater- 

 nal bladder. — hhh, The real head of these vesicular worms. 

 — ilk, vSocial vesicular worms found interiorly with the head 

 turned inward. 



Fic^. XII. A B, Two social vesicular worms, which form a part 

 of the families already described and magnified b}^ a weak 

 lens, (nos. 1,2.) — aa^ Head of the worm.— -66, The posteri- 

 or part furnished with two points in form of crotchets, with 

 which it fix6s itself to the small bladders or vesicles repre- 

 sented in figures X, XL 



Fig. XIII. Lobe of the medullary substance of the brain (►f a 

 sheep which had vertigo, in which may be seen « 6 c, the nat-- 

 ural size of the cavity which contained the little bladders of 

 fi"-. X and XI. 



