33« 



Y. OKADA : 



(i3+' 8 ) + (i3 + 4'ì + (i3 + ^ 5 ) + (5 + -0 



I I . 



(i7 + 7 r + -i) (9 + ^+0 



(i7 + ^) + (u+.r) 



Same of another fragment : 



(23 + 2 r +r 6 + .v) 

 I 



(i7 + 3 r ) + (*) 

 (3+*) - 

 (l7 + ^ 2 ) + (4 + -v) 

 (i4 + r 4 + .v) 



This species is closely allied to Crista denticulata (L.) in the zooecial 

 arrangement, but is distinguished from it by being prolonged and somewhat 

 narrowed at zooecial apertures and by the shape of ovicells. Osburn has 

 described a form found in Woods Hole under the name of Crista denticulata, 

 but judging from the description and figure given by him, I should think 

 that form to be scarcely separable from Crista ebumco-denticulata Smitt. 



Measurements : 



mm. 



Diameter of zooeciopore 0.06 



Breadth of zooecium 0.0S 



Distance from aperture to aperture 0.28 



Breadth of ovicell 0.44 



Length of ovicell 1.34 



4. Crista franeisenna Robertson 1910. 



Crista franciscana, Robertson 1910 (2), 233, pi. xviii, figs. 1-4. 

 Crista occidentalism Robertson ig03 (i), 116. 



A number of large colonies, which may be identified with the above 

 species, exist in the collection. They were all obtained in Hakodate at 

 shallow water, attached on rocks and seaweeds. The arrangement of 

 zooecia in ooecial internodes differs somewhat from that in the Californian 

 specimens described by Robertson. The ooecial internode in the Japanese 



