SIXTEN BOCK, TWO NEW COTYL. GEN. OF POLYCLADS. 25 



cells of the ovary apart from the single larger oocyte lack 

 any traces of yolk-granulse. Nor is there yet any chromo- 

 philous substance which starts the forming of the yolk. Thus 

 the cells contain a homogeneous-looking plasma, i. e. pure 

 protoplasma. 



The reduction of the number of ovaries stånds in relation 

 to the size of the mature eggs, in this case as well in Chro- 

 m(yplana, Enferogonimus, Laidlaicia and Leptoieredra. All 



Fig. G. 



Amyella liiieata n. g. n. sp. Section of ovary, with germinating zone and 

 the large oocyte with its oval nucleus. Zeiss 1,8 mm.XOc. 1. 



these small-sized animals are not able to deliver a large 

 amount of such gigantic eggs at the same time and thus all 

 these genera have the number of the ovaries reduced. 



The whole male copulatory apparatus is directed forward 

 like that of Chromoplana. At first sight the apparatus seems 

 to consist only of a large thin-walled seminal vesicle and 

 an unarmed thick fleshy penis filling up the whole antrum 

 masculinum. (Plate 2, fig. 5). There is no penis fold ( = 

 Penisscheide). 



The penis is pierced by a nearly straight, rather wide 

 canal running from the seminal vesicle to the tip of the 

 penis. A closer investigation will show the granular gland- 



