&8 PARASITOLOGY. 
Genus and Species—Continued............ Taenia Serrata. 
Taenia Serialis. 
Taenia Canina. 
Taenia Crassicollis. 
Ba milyszs.ciccc les Bothriocephalidae. 
Genus and Species... cee: cece eee Bothriocephalus Latus. 
ANNELIDA. 
HaEmopis SANGuIsuca (Sanguis—blood ; sugere—to suck). 
Synonym.—Horse-leech. 
Distribution.—Found in Europe, America, Turkey 
and Africa. 
Description.—The leech is black or brownish in 
color, flattened ventrally and rounded dorsally. The 
body is composed of ninety-five to ninety-seven 
rings. It is soft, slimy and capable of great exten- 
sion and contraction. It is provided with an oral 
and an anal sucker; the suckers are shaped like the 
beak of a flute. The mouth is located in the oral 
sucker; it is arranged in the form of a three-rayed 
star, each ray forming a slit through which a jaw 
may pass. By means of this sucker it holds firmly 
to the mucous membrane, and by means of the teeth 
in the jaws to wounds it, and thus is enabled to 
suck the blood. The anal sucker is nearly twice as 
large as the oral one, and aids in holding on to the 
host; the anus opens at the upper border. Ten eyes 
are located on the anterior part of the dorsal surface. 
The leeches are hermaphrodites; they are two to 
three inches in length. 
Life Cycle.—Leeches inhabit the water. The fe- 
males, at the time of ovulation, leave the water and 
bury themselves in the mud, where twelve to twenty 
eggs are laid; the female then crawls out, leaving 
the eggs buried as in a cocoon. These eggs hatch 
