PARENCHYMATA. BY (| 
"TETRARHYNCHUS, Rud. 
The Tetrarhynchi merely appear to be Floriceps naturally reduced 
to the head and two joints, instead of having an elongated and pluri- 
articulated body. 
T. lingualis, Cuv. Very common in the tongue of the Tur- 
bot, and of several other fishes(1). 
TEnTAOULARIA, Bosc. 
Only differ in consequence of the tentacula being unarmed. 
Naturalists have also distinguished from the ordinary 
Teniz those, which, witha similar head, that is one with four 
suckers, have the body terminated posteriorly by a bladder. 
Their joints are not as distinctly marked as in the prece- 
ding ones. ‘The genus 
Cysticercus, Rud. 
Vulgarly termed Hydatids, is composed of those in which the blad- 
der supports but a single body and one head. They are particularly 
developed in the membranes and cellulosity of animals. 
C. globosus; Txnia ferarum, T. caprina, T. ovilla, T. verveci- 
na, T. bovina, T. apri, T. globosa, Gm.; Geetz., XXII, A. B; 
Encyc., XX XIX, 1, 5. This species is found in a great num- 
ber of Quadrupeds, the Ruminantia especially. 
C. pisiformis; Tenia cordata, T. pisiformis, T. utricularis, Gm.; 
Geetz., XVIII, A, B; Encyc., XX XIX, 6, 8. Very common in 
the Hare and Rabbit. 
C. cellulose; Tenia cellulose, T. finna, Gm.; Blumenb., 
Abb., fascic. IV, pl. 39. This species is the most celebrated 
of the whole number, and lives between the fibres of the mus- 
cles of the Hog, producing the disease called measles. It is 
small, and multiplies prodigiously in this disgusting disease, 
penetrating into the heart, eyes, &c. Similar animals have, it 
(1) For this genus, see Rud., Hist., If, 318, and Syn., 129. 
