Notes on Coeloplana bockt n. sp. 

 and its development. 



By 



Taku Komai, 



Zool. Inst., Sci. Coll., Tokyo Imp. Univ. 

 With s textfigures. 



During the summer of 1918, I have had opportunities of collecting 

 and studying in the Misaki Marine Laboratory a species of Coeloplana 

 which lives commensally on stocks of an alcyonacean and which I 

 regard to be new to science. According to verbal communication of 

 Professor Ijima, Dr. S. Bock of Upsala should have discovered, some 

 years ago, specimens of Coeloplana on Nephthya stocks which were 

 collected and preserved in Misaki and taken over by him to his country. 

 It is then more than probable that the first discovery of the Coeloplana 

 in question is to be credited to him. However, so far as I am aware 

 of, the species has never yet been described. Therefore, I take the 

 liberty of calling it by the name of Coeloplana bocki in honour of the 

 above Swedish zoologist. 



The alcyonacean, on which the Coeloplana habitually occurs, 

 represents, in my opinion, a species of the genus Dendronephthya. It 

 thrives in fair abundance in the littoral of the neighbourhood of Misaki. 

 Stocks of it harbouring the Coebplatia are not at all uncommon. It 

 is not seldom that as many as fifty or sixty individuals of that worm- 

 like coelenterate are taken from one and the same stock of a moderate 

 size. The coelenterate may be found adhering to any part of the stock 

 surface. 



