2 ARKIV FÖE ZOOLOGI. BAND 14. N:0 13. 



witb four longitudinal bands of a fuscous blend. These bands 

 are of such an extension and vvidtb that the uncoloured area 

 is limited to a narrow marginal band, a notch-like spöt at the 

 anterior end, a field över the brain and three very longitudinal 

 lines in the middle part of the body. The two middle sym- 

 metrical. brown longitudinal bands which begin close behind 

 the brain are much narrower than the coloured side-fields. 

 The body is 3 mm. long and 1 Vs öim. broad. The ani- 

 mal is unusually thick in relation to its size, ^/s mm. The 

 shape of the body is almost oval, slightly pointed at the 





/>' ;" 



Fig. 1. 



Ghromoplana bella n. g. n. sp. Sagami Misaki 13th of June 1914. Zeiss 

 Obj.AXOc. 2. The f rontal end of the body, seen from the dorsal side. 



end. The anterior frontal line may be more or less straight. 

 Marginal tentacles are totally absent. 



It has not the thin and delicate body of other Polyclads 

 and it is in this respect much like the marine Triclads, as 

 pointed out above. 



The arrangement of the eyes (text fig. 1) is character- 

 istic, there being only three pairs of cerebral eyes and a 

 very small number of marginal or, as I should rather like 

 to call them, margo-tentacular eyes; in spite of that there 

 are no traces of any tentacles at all. There can hardly be 

 any doubt that they, as well as the similarly situated eyes 

 in Aceros and Prostiostomurriy correspond to the tentacular 

 eyes of the Pseudoceridce and Euryleptidce. These marginal 

 eyes occur in a single row at the frontal end and are hardly 

 separated in two distinct dusters. This arrangement might 

 therefore possibly indicate that the ancestors of Ghromofilana 

 have never possessed an37^ tentacles. 



