A Report on the Cyclostomatous Bryozoa 

 of Japan. 



By 



Yaichirô Okada, 



Zoologioal Institute, Sci. Coll. 



The collection of Japanese cyclostomatous Bryozoa in the Zoological 

 Institute, Sci. Coll., Tokyo, was assigned to me for examination by Professor 

 Ijima. The outcome of my studies is this report, dealing with seven genera 

 and thirty-two species. Of the latter I consider six to be new to science. 



I beg here to express my heart}- thanks to the above named gentleman 

 for supervision of the work, and also to Professor Goto, Dr. Kinoshita, Mr. 

 Yanagi and Mr. Ogura for assistance rendered me in one way or other. 



Crisiidae Johnston 1S38. 

 Crisia Lamouroux 18 12. 



I. Crisia aculeafa Hassall 1 84 1 . 



Crisia aculeata, Hassall 1841 (1), 170, pi. vii, figs. 3, 4. — Johnston 1847 (2), 285. — Smitt 1863 



(1), 3. — Harmer iSgi (1), 132, pi. xii, fig. 4. 

 Crisiti eburnea, var. aculeata, Busk 1S75 (4), 4, pi. v, figs. 5-10.— Hincks 1S80 (3), 421, pi. Ivi, 



figs. 5, 6. 



A few small fragments, which may be identified with the above species, 

 are found in the collection. They were obtained at Okinosé Bank, Sagami 

 Sea, from a depth of 400 fms. The fragments exhibit the peculiar ovicell 

 described by Harmer from British specimens of the species, but are entirely 

 devoid of the spines. The zooecia occur on complete internodes usually in 

 an odd number, and rarely in an even number. Formula of a fragment : 



