344 



y. okADA : 



the extreme tip of a branch clown to the level of the ninth zooecial series. 

 It shows, on both its sides, lateral outbulgings which just out between 

 the inner ends of every two successive zooecial scries of the region. 

 Ooeciostome not yet developed. 



The above type specimen was obtained by Professor Ijima at a spot off 

 to the west of Ni ijima, one of the Seven Islands of Izu. Depth unknown. 

 Somewhat smaller specimens, which may be regarded to be specifically 

 the same as the above, are to hand from two more localities in the Sagami 

 Sea, viz., from Kôzushima, another of the Seven Islands (Dr. Kinoshita 

 coll., depth not stated), and from a spot off Jôgashima (70-80 fins.). 



The Kôzushima specimens have internodes and branches which are 

 much more slender than in the type. Moreover, the number of zooecia in 

 a series never exceeds two ; and in the proximal parts of internodes and 

 branches, there stands a single zooecium in place of a series. Ovicell not 

 found. 



The Jôgashima specimens include some very small and yet unbranched 

 colonies consisting of a single internode which stands erect but is slightly 

 bent in the upper parts. The specimens with branches are in part essentially 

 like the type, while some others show points of considerable variation from 

 it, especially with respect to the zooecial number in a series and the number 

 of branches springing out from an internode. Usually three, not unfrequent- 

 ly two, zooecia constitute a series. The branches from an internode number 

 two or three and seldom only one or as many as four. Here again the 

 branch bearing zooecia are, in the first instance, the innermost of a series ; 

 and the second zooecium, lying next outer to a branch-bearing first zooe- 

 cium, may also carry a branch in certain cases ; while the third zooecium, 

 which is usually the last or the outermost in series, never carries a branch. 

 Ovicell was found in none of the specimens. 



The new species described above is generically associated with 

 Robertson's Crisulipora occidentalis, the only species hitherto known of 

 the genus, with much reserve. Not improbably the new species represents 

 a distinct genus. It may be pointed out that, while Crisulipora cccidcntalis 



