Description of Some Japanese Polycîad Turliellavia. 



Family Euryleptirist». 



21. Oycloporus papillosus (M. Saus). 



Family Prostliiostomirisv. 



22. Prosthlodomum siphunculus (Delle Chiaje). 



23. ,, grande Stimpson. 



24. ,, marmoraium, n. sp. 



25. , , awaense, n. pp. 



26. ,, rufiropunctaium, n. sp. 



Suborder ACOTYLEA Lang. 



A. Section CRASPEDOMMATA BOCK. 



Family Discocelidsc Laidlaw. 



Genus Discocelin Ehrbg. 1836. 



1. Discocelis japonica, n. sp. 



(PI. II., fig. 3.— Textfig. 1). 



A large number of this new species were obtained at Misaki, 

 Enoura in Prov. Suruga, and Shirahama in Prov. Awa, at the low- 

 tide mark. 



Body broadly oval, rather thick and of a moderately firm 

 consistence, usually reaching 40 mm. in length and 20 mm. in 

 breadth. 



Colour of dorsal surface light vinaceous cinnamon, darker in 

 the central parts, and uniformly spotted all over with small darkish 

 brown blotches which become gradually smaller and fainter towards 

 the body margin. Ventral surface much paler than the dorsal, 

 without the blotches. Pharynx and genital system discernible to 

 a certain degree on the outside. 



Tentacles absent. Tentacular eye-spots occurring in two 

 round, crowded clusters, situated at a distance of about one-fifth 

 the body-length from the anterior end and separated from each 

 other by a distance of 2 mm.; each cluster consisting of 15-20 

 eye-spots, surrounded by a clear space. Cerebral eye-spots present 



