On a Collection of Japanese Cheilostomatous 

 Bryozoa. I. 



By 



Naokatsu Yanagi, Rigakushi 



and 



Vaichirö Okada. 



With Plate VI. 



As a result of our studies on the Cheilostomatous Bryozoa of 

 Japan, we propose in this paper to report on the Cellulariidae and the 

 Bicellariidae. Both the families are well represented in the Japanese 

 waters, altogether some seven genera and twenty-eight species having 

 so far come to our knowledge. Of the latter, ten seem to be new to 

 science. The collection, including the types, iß preserved in the Science 

 College, Imperial University of Tokyo. 



Cellulariidae Johnston (pars) 1849. 

 Key to the genera. 

 I. Zoarium jointed 2. 



1. Zoarium not jointed 3. 



2. Zocecia not exceeding 10 in number to one intemode ; vibracula absent 



, Menipea. 



2. Zoœcia not exceeding 40 in number to one intemode ; vibracula present, not 

 covering the dorsal surface of zorecium Scritpoccllaria. 



3. Vibracula present, covering the dorsal surface of zoœcium Caberea. 



Menipea Lamouroux 1812. 



Key to the species. 



I. Zocecia usually 3 to an intemode ; without frontal avicularia 2. 



I. Zocecia numerous on intemode; with frontal avicularia 3. 



