A REPORT ON THF. CYCLOSTOMATOUS BRYOZOA OF JAPAN. 



337 



Measurements : 



mm. 



Diameter of zooeciopore 0.08 



Distance from aperture to aperture 0.3c— 0.42 



Width of branch 0.12-0.16 



Length of ovicell 0.44 



Breadth of ovicell 0.26 



Diameter of ooeciopore 0.05 



Compared with the description given by Harmer of the Japanese 

 specimens preserved in the Cambridge Museum, the specimens before me 

 are smaller in the dimensions of parts, though agreeing in all essential 

 characters, especially in the features presented by the ovicells. Waters 

 has described Crista circinata as distinct from Crisia murata on the basis 

 of a difference in the shape of the ovicells. In the Okinosé specimens, I 

 find the ovicell shaped somewhat as was given by him for Crisia circinata, 

 but in all other respects they agree perfectly with Maplestone's Crisia 

 cune at a, so that there can scarcely be a doubt as to their specific identity 

 with the latter. I should think the Waters' species can not be held up as 

 distinct from Crisia citneata. 



3. Crisia ebitrneo-denticulata Smitt 1865. 



Crisia eburneo-dentiadata, Smitt 1865 (2), 14?, pi. xvi, fig. 9. — Busk 1875 (4), 5, pi. vi. — 



Ortmann 1890 (1), 58, pl. iv, fig. 18. — Waters 1904 (5), 165. — Waters igi6 (11), 474. 

 Crisia denticolata, Osburn 1912 (1), 216, pi. xviii, fig. 8. 



This species is found in abundance between tidemarks along the coast 

 near Misaki, attached on stones and shells. It was dredged from a con- 

 siderable depth off Jôgashima, and also in Chichijima, Bonin Islands (45 

 fms.). In the specimens before me, the mode of branching differs some- 

 what from the Japanese specimens described by Ortmann. Formula of a 

 fragment : 



