144 SIDNEY P. HAEMEB. 



most striking case observed illustrating this point had the 

 formula — 



(7 + Ov. + 11 + r, + r^ + r, + ,r + r,, + .t). 



It cannot fail to be remarked that the character of the 

 branching is much more variable in this species than in 

 C. eburnea. 



The joints are usually yellow ; the articulations which bear 

 the branches are usually short, and are then very similar to 

 those of C. eburnea; in some cases, however, they acquire 

 the form characteristic of C. ramosa. 



Near the ends of the branches, where most of the zooecia 

 have polypides, the ends of the zooecia are, in most cases, long 

 free tubes, and are thus strikingly different from those of 

 C. eburnea. The free portions of the zooecia are either 

 gradually bent forwards from the point where they leave the 

 branch, or they may be bent forwards at a distinct angle from 

 this point. The curvature of the zooecia is, in either case, 

 different from that of C. eburnea. The zooecia are dis- 

 tinctly longer and more " loosely aggregated " than in that 

 species; and the branches are usually of slenderer habit (as 

 recognised by Johnston^). 



The ovicell is nearly always higher in the internode than in 

 C. eburnea. In the average of a considerable number of 

 observed cases the ovicell was in the position of the 5th — 6th 

 member of the internode above the joint, and thus replaced 

 z^ or 3^". In one case the ovicell replaced the 8th zooecium, 

 and in another it was the 3rd unit of the internode ; in no 

 case was it found lower. 



The stem is not usually jointed above the ovicell ; and fig. 4 

 is, consequently, a somewhat exceptional case. As in the pre- 

 ceding species, the ovicell is normally borne by a terminal 

 internode ; and a considerable number of zooecia may be added 

 above the ovicell. 



» 'Brit. Zoophytes,' ed. 2, p. 286. 



