JOURNAL OF THE COLLEGE OF SOTENOE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXIII., ARTICLE 13. 



Notes on Some Rare Fishes of Japan, with 



Descriptions of Two New Genera 



and Six New Species. 



By 



Shigeho Tanaka, Bigahushi. 



Zoological Institute, Science College, Imperial University of Tblujh. 



With 2 plates. 



In the present pajier are given notes on some rare Japanese 

 fishes, of which one species is from Tshigaki Island (one of the 

 Riu-Kiu Islands) and all the rest are from the eastern coast of 

 Japan proper. The material are contained either in the Zoological 

 Institute, Science College, Imperial University of Tokyo or in 

 Mr. Alan Owston's collection. Of the eight species noted upon, 

 six are apparently new to science. The list is as follows : 



1. Gymnosiiaenchehjs leptosomus, n. g-., n. sp. 



2. SjjJiagebranchus einctus, n. sp. 



3. Maerostoma quercinwn japonicum, n. sul)sp. 



4. Astronesthes vjimai, n. sp. 



5. Piieiidoscopeius scriptiis sar/amiamts, n. subsp. 



6. Bassogigas grandis (Günther). 



7. Ceratias (Parcccerafiax) mitsiikurii, n. subg., ii. sp. 



8. Corynolophus rcivhardli (Lu'J'kicn). 



