20 ARKIV FÖR ZOOLOGI. BAND 14. N:0 13. 



ductus ejaculatorius (in the proper sense). The female term- 

 inal apparatus is built according to the common cotjiean 

 type. The two longitudinal narrow uteri are provided witb 

 numerous iiterine vesicles. The ovaries are very numerons 

 and situated dorsally. 



As can be gathered from this account there are too 

 many divergencies to permit us to include Chromoplana in 

 the Pericelidce. It is true that an allied form to Chro7noplana, 

 Amyella, described in this paper, shows certain similarities in 

 respect to the male apparatus with Pericelis, such as a fleshy, 

 unarmed penis without penis folds, no distinct prostatic 

 vesicle, but too many divergencies are still left. Even the 

 similar features mentioned must not be pressed too far, as 

 with regard to the structure many discrepancies can be 

 enumerated. And the direction of the male copulator}^ 

 apparatus is opposed in the two cases. 



I have all the more reason not to alter the family Peri- 

 celidce as I have from the Pacific another cotylean genus 

 with two species which I can include in this family, whicli 

 still remains a typical tropical family. 



As a result of this discussion it is evident that we cannot 

 include Chromoplana in any of the hitherto established fam- 

 ilies. There are certain agreements in organisation with 

 the Pericelidce, Pseudoceridce-Euryleptidce and Laidlawiidce . I 

 must therefore establish a new family, Ghromoplanidce, the 

 diagnosis of whicli is given at the end of this paper. 



Amyella liueata, n. g. n. sp. 



Several specimens of this new polyclad were found in 

 May and June 1914 at the Biological Station a t Misaki. I 

 coUected them in the same locality where I found Chromo- 

 plana, i. e. among Corallina-weeds in shallow water and tidal 

 pools close to the station. 



It is a more narrow polyclad than Chromoplana, broad 

 at the front, pointed at the end of the body. Its size is 

 even smaller than that of the former genus, 2,8 mm. in 

 length, and 0,8 mm. in breadth. Another specimen measured 

 only 2 mm. in length. It is the most minute polyclad ever 

 described. In relation to its size it is very thiok, V^ mm. 



