Description of Some Japanese Polyelad Turbellaria. 25 



leads into the annularly outbulging antrum femirTinum (a/), which 

 is surrounded by numerous shell glands (sg). The female aperture 

 lies closely behind the male. 



The present species seems to be nearly allied to both Para- 

 planocwa rotumanensh Laidlaw (1903a) and P. discus (Willey 

 1897), but may he distinguished from the former by certain 

 features of cerebral eye-spots and of genital organs, and from the 

 latter chiefly by the different colouration of body and the entire 

 absence of the two peculiar glands connected with the antrum 

 musculinum. 



Family Diplosolenidii- Bock. 



This family was recently instituted by Bock to receive the 

 genus Diplomlcnia Haswell. We think that the new genus 

 described below by the name of Pseudostylochus as well as Sttmpson's 

 old genus Gallioplana may he ranged under the family, under which 

 circumstance the family diagnosis as given by Bock requires 

 emendation. It may be made to run somewhat as follows: 



Schematommata with oval body. Tentacles present. Ten- 

 tacular and cerebral eyes in distinct clusters. Mouth subcentral. 

 Pharyngeal chamber much folded in relation to plicated pharynx. 

 Prostate a free saccular body opening into ejaculatory duct. With 

 either true or accessory seminal vesicle. Penis armed or not 

 armed. Without vagina bulbosa. Accessory vesicle of vagina 

 single or paired. 



Genus Pseud ostylochus^ n. gen. 



Diplosolemdai with oval body. Tentacles small and indistinct. 

 With true seminal vesicle. Prostate situated dorsal to seminal 

 vesicle. Penis unarmed. Accessory vesicle of vagina single, 

 large. 



This new genus agrees with Sty loch id-genera in the general 

 plan of genital end-organs, but differs from them chiefly in the 

 total absence of marginal eyes, in which respect it more nearly 

 approaches both DiplosoUnia Haswell and CaMioplana Stimpson. 



