A SURVEY OF THE GROUP 

 (a) 



23 



4 mm 



Post. SU 



Ovary 



Fig. 12. (a) general appearance of Acanthobdella ; 



(b) details of anterior region showing chaetae; 



(c) diagram of anatomy of Acanthohdella. 



All after Livanow, 1906. (c) reproduced from Grasse, 1959. 



2. Glossiphoniidae 

 The characters of a typical glossiphoniid leech are illustrated 

 by Glossiphonia complanatay a common European, Asian and 

 American species which sucks the body fluids of aquatic snails. 

 A typical segment has three annuh, there being only 68 annuli in 

 front of the posterior sucker. There are three pairs of eyes 

 arranged in two parallel rows, and two lines of dark pigment, 



