476 CLASS ECHINODERMATA, 
TENIOIDES, 
Embraces those in which the head has two or four pores, or 
suckers, placed round its middle, which itself is sometimes 
marked by a pore, sometimes provided with a small proboscis, 
either naked or armed with spines. Sometimes there are four 
small proboscides thus armed. 
Its most numerous genus is that of 
TENLE. 
Their body elongated, often to an excessive degree, flat, com- 
posed of articulations, more or less marked, grows narrow in 
front, and generally supports there a square head, hollowed 
with four small suckers. 
It has been thought that canals were perceptible, which 
proceed from these suckers, and extend along the margin of 
the articulations of the body. These last have each one or 
two pores, diversely placed according to the species, and which 
appear to be the orifices of the ovaries, which are themselves 
situated in the thickness of the articulations, when they some- 
times assume a simple figure, and sometimes are divided into 
ramifications. The teniz are in the number of the most cruel 
enemies of the animals in which they are developed, and 
which they appear to exhaust. 
Some have no projecting part in the middle of the four 
suckers. Such is in man the 
Tenia lata, Rud. T. vulgaris. Gm. Goetz. xli. 5—9., whose 
articulations are broad and short, and have a double pore in 
the middle of each lateral face. It is very commonly of the 
length of twenty feet, and it has been seen even more than a 
hundred. The large ones are nearly an inch in breadth ; but 
the head and the anterior part are always very slender. It is 
extremely troublesome and tenacious. It is frequently found 
_ difficult of expulsion, by the most violent remedies. 
