68 PARASITOLOGY. 



Genus and Species — Continued Taenia Serrata, 



Taenia Serialis. 

 Taenia Canina. 

 Taenia CrassicoUis. 



Family Bothriocephalidae. 



Genus and Species Bothriocephalus Latus. 



ANNELIDA. 



Haemopis Sanguisuga (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 



