ORDER PARENCHYMATA. 479 
bladder. Their articulations are not as distinct as in the 
preceding. 
CYSTICERCUS, Rud. Vulgo. HYDATIDEs, 
Are those in which the bladder supports but a single body, 
and a single head. They are particularly developed in the 
membranes, and the cellular substance of animals. 
There is one species which multiplies in a great number of 
quadrupeds, especially in the ruminantia. It is the globular 
hydatid (Tenia ferarum ; T. caprina ; T. ovilla; T. bovina ; 
T. apri; T. globosa, Gm.) Geetz. xvii. A.B. Encyc. xxxix. 
6—8. 
Another is very common in hares and rabbits; Tenia cor- 
data ; T. pisiformis ; T. utricularis, Gm. Goetz. xviii. A.B. 
Encyc. xxxix. 6—8. 
But the most celebrated is that which remains between 
the fibres of the muscles of hogs, and produces what 
is called in them measles. Tenia cellulosa, and T. jinna, 
Gm. Blum. Abb. 4. Cah. pl. 39. It is small, and multiplies 
excessively in this disgusting malady, penetrating even into 
the heart, the eyes, &c. It appears that similar ones have 
been observed in some apes, and evenin man. But it is said 
never to be found in the wild boar. 
AcROsTOMA, Le Sauvage. Ann. des Sc. Nat., 
Is very much akin to this genus. It lives in the amnios of 
COWS. 
C@NuRUS, Rud., 
Have several bodies and several heads, attached to the same 
vesicle. 
One very celebrated species is known; Tenia cerebralis, 
Gm. Getz. xx. A.B. Encyc. xl. 1—8., which is developed 
