342 



V. OK A DA : 



7. Crista sinctarcnsis Busk 1S75. 

 Crisia sinclarensis, Busk 1875 (4), 6, pl. iv, figs. 7-u. 



There exist in the collection a number of large colonies, which may be 

 identified with the above species. They were all obtained from shallow 

 water, attached on stones and kelps at Hakodate. Every colon)' is pro- 

 vided with numerous segmented rootlets which are given off from either 

 the lateral or the dorsal side of the lowest zooecium, a fact of which no 

 mention was made by Busk for the British specimen. The minute per- 

 forations on zoarial surface are distinctly densely present, not scantily as 

 was given by Busk. Formula of a fragment : 



(9 + ^) + (9+i r ) + (7 + ^) 

 I 



(9+i r ) + (5) + (-0 ' 

 (ir +> 1 ) + (7+ i r ) + (5 +' 1 ) + Gv) 



(7+ !')+(*) 



Measurements : 



mm . 



Diameter of zooeciopore 0.04-0.06 



Distance from aperture to aperture 0.18-0.2 



Tubuliporidse Johnston 1838. 

 Crisulipora Robertson 19 10. 



8. Crisulipora occident alis Robertson 19 10. 



Cristdifora occidentali*, Robertson igio (2), 254, pi. xxi, figs. 22-24. 



Numerous large colonies in the collection are referable to the above 

 species. They were all obtained from shallow bottom along the Mi.sa.ki 

 coast. They grow on stones and shells, forming dense tufts of a consider- ^ 

 able size. As was already pointed out by Robertson, the present species 

 exhibits many characters which may be said to be intermediate between 

 those of the Tubuliporidce and the Crisiidœ. It may even be said that in 

 many respects the species stands nearer to the latter than to the former. 



