182 CLASS V. 



named these pathological products and Echinococcus also Acephalo- 



cystes. 



True echinococci propagate themselves by means of cells or vesicles 



within the parent vesicle. This last consists of several concentric, 



thin, albuminous layers ; see VON SIEBOLD'S figure in YOGEL Icon. 



Histologice pathologicce, Tab. xu. fig. 11. Frequently the worms die 



in the living body and the vesicles are changed into a gelatinous, 



yellow-green mass. 



Comp. RENDTORFF de Hydatidibus in corpore humano, prcesertim in 

 cerebro repertis, Berolini, 1822, 8vo. ; KUHN Recherches sur les Acephalo- 

 cystes, Mem. de la Soc. d'Hist. not. de Strasbourg, i. i, (1833) ; a l so trans- 

 ferred to the Ann. des Sc. not. Tom. xxix. pp. 273 300. (The Author 

 distinguishes Acephalocystis endogena and A. exogena; some Echinococci 

 appeared to multiply themselves by forming new vesicles on the outside of 

 the parent vesicles ; such vesicles, he says, occur, especially in the sheep, in 

 the lungs and liver ; VON SIEBOLD has not remarked this mode of propaga- 

 tion ; WIEGM. and EKICHSON'S Archiv f. Nalurgesch. 1845, 2 Bd. s. 241.) 

 GLUGE Note sur la structure microscopique des Hydatides, Buttet. de 

 VAcad. royale de Bruxelles, 4 Nov. 1838, Ann. des Sc. not. 2e SeVie, 

 Tom. vui. Zool. pp. 314 317. 



Sp. Echinococcus erraticus mihi, Echinococcus veterinorum RUD., Hist. not. 

 Entoz. Tab. xi. fig. 4, BREMSER, Icon. Helminth. TAB. xvm. figs. 3 13; 

 in many domestic animals, especially in their liver. The Echinococcus 

 hominis RUD., is probably not a different species from this. It has been 

 met with in the abdominal cavity, in the liver, in the heart, also in the 

 voluntary muscles, and in the cavities of the brain (ventriculi cerebri). 



Ccenurus RUD. Vesicle single, on which are seated several 

 worms, retractile, depressed, rugose. 



Sp. Coenurus cerebralis RUD., Hist. nat. Entozoor. Tab. xi. fig. 3, BKEMSER, 

 Icon. Helminth. Tab. xvm. figs, i, 2. There is only one species known, 

 which occurs in the brain and spinal cord of sheep, occasionally also in 

 cattle, in a species of antelope, and according to ROUSSEAU in rabbits. 

 The Vertigo of sheep (le tournis, das Drehen) is a consequence of these 

 worms ; the symptoms vary according to the situation occupied by the 

 worms ; the general characters of the disease are, that the sheep at first are 

 somnolent, then fall into convulsions, run up and down and die of exhaus- 

 tion. The vesicles, filled with water, by their expansion compress the 

 brain and distend the ventricles, and this sometimes to such an extent, that 

 the bones of the skull are affected and become extremely thin. 



Cysticercus RUD. Worm solitary with depressed and roundish 

 body passing into a caudal vesicle. Another vesicle external, in- 

 cluding the worm. 



Sp. Cysticercus cellulosce RUD., Hydatis finna BLUMENB. Abb. naturhist. 

 Gegenstdnde, Tab. 39 (copied in GUEB. Iconogr. Zooph. PI. 13, fig. 5), 



