SIXTEN BOCK, TWO NEW COTYL. GEN. OF POLYCLADS. 18 



in the epitlielium and beneath the basement membrane just 

 as is the case in the Psendoceridce and Eurylepiidce as well. 



The pharynx of Chromoplana agrees with that of the 

 Psendoceridce, but not with that of the Euryleptidce. The 

 pharyngeal chamber of the former family is usually un- 

 branched, in Chromoplana it is provided with some sidc 

 pockets. 



The intestine of Chromoplana is, on the other hand, more 

 similar to that of the Euryleptidce, the gut-branches freely 

 anastomosing in the Psendoceridce, But this seems to be of 

 no very great systematic value, to judge from the conditions 

 of other genera of polyclads. 



The female terminal apparatus agrees well with the 

 common cotylean type, and so with both the families men- 

 tioned. The absence of the uteri is probably a secondary, 

 not a primitive feature, if it really is a usual feature in the 

 genus. On the other hand nothing can be said about the 

 absence of the accessory vesicles which generally occur in 

 the Pseudocerids and the Euryleptids. 



The raale copulatory apparatus of Chromoplana is differ- 

 ently organized from that of other Cotyleans yet described. 

 It is more like that which we meet in the acotylean family 

 Leptoplanidce or even still more like that of the Cestoplanidce, 

 where the male apparatus is directed forward, the only ex- 

 ception to the rule in the Acotyleans. Of all the Acotyleans 

 the Cesloplanidce are most closely related to the Cotyleans. 

 The male apparatus of the Psendoceridce and the Euryleptidce 

 are of such uniform shape and structure that different genera 

 cannot be distinguished by it. There is in this new genus 

 a large reservoir for sperma behind the true seminal vesicle. 

 The sperma must on its way out pass through the prostatic 

 vesicle, as the seminal vesicle opens in the back end of the 

 prostatic vesicle, the first example known in the Cotyleans. 

 In shape and direction as well as because it is provided with 

 a penis-fold the penis is like that of the two families referred 

 to. But the penis is unarmed here, while it is, without 

 a single exception, armed with a stylet in those families. 

 That is, however, of no great importance, as we can judge 

 fromt he conditions in the Leptoplanidce. The genera Sty- 

 lochoides, Enterogonimus, Leptoteredra and Laidlaivia in the 

 Cotyleans point in the same direction but to a less degree, 



