250 Mr. CARLISLE’ Obfervations 
any other fpecies. The people of Switzerland have the Tama 
lata, &c. 
The ftructure of Zezz is very fimple, for, being intended to be 
nourifhed by already digefted food, they are deflitute of the com- 
plicated organs of digeftion. 
The Tenia Solum of Linnzus is the animal which I intend to de- 
fcribe particularly; but other fpecies, and other fimilar worms, will 
be taken notice of, by way of illuftration.- | 
This animal is compofed of a head, in which is a mouth adapted: 
to drink up fluids, and an apparatus for giving the head a fixed: 
fituation. The body is compofed of a great number .of ditin 
pieces, articulated together, each joint having an organ whereby 
itattaches itfelf to the neighbouring part of the inner coat of the: 
inteftine. The joints neareft the head are always fmall, and. they 
become gradually enlarged as they are farther removed from it; but 
towards the tail a few of.the laft joints again become diminithed, 
in fize. The extremity of the body is terminated by a fmall 
femicircular joint, which has no opening in it. i 
* Fhe external parts of this animal are clothed with a fine mem. 
brane refembling cuticle; immediately under which there is æ 
thin layer of fibres, lying parallel to each other, and running in the 
direction of the length of the animals body: thefe fibres arife 
from a denfe, white, opake line of fubftance, which connects the: 
individual joints together; and the layer of fibres, having clothed’ 
both the flatted fides of the joint, 1s inferted into the fame kind o£ 
ligamentous fubftance which conneéts the next fucceeding joints. 
together. 
- The motions of this animal’s body are always in the direction of 
thefe fibres, and from hence we may conclude that they perform: 
the office of muícles It may be worthy of remark, that thefe: 
Tui : | fibres. 
