104 



by Hincks and Busk. The distal wall is angularly benl, and to judge from the 

 structure of these zooecia this species can be referred neither to Bicellaria nor to 

 Cornucopina. The structure of the ocecia is not known. The stem-segments have 

 a structure quite similar to that of the last species, and the above-expressed 

 suggestion, that new segments may be inserted between the older ones, is streng- 

 thened by the fact that every second segment of the specimen examined by 

 Hincks is scarcely half the size of the others. There is also a very small seg- 

 ment (the fifth) in the colony examined by me. According to Waters' investi- 

 gations, the radical fibres quite agree with those in B. caliculata and have especi- 

 ally the same kind of pear-shaped expansions. 



The small colony which I have received through the kindness of Miss Jelly, 

 comes from Port Phillip, Australia. 



Bugula caraibica n. sp. 

 (PI. Ill, figs. 2 a— 2 n). 



The zooecia, which increase in width distally from the narrow proximal end, 

 are turned inwards towards the middle of the branch, in such a way, that the 

 frontal areas of two neighbouring zooecia form nearly a right angle with one 

 another, and they have thus, to judge from Kirkpatrick s figure, been subject 

 to a much smaller turning than the zooecia in B. Haddoni. The frontal end is 

 cut off straight and the basal surface strongly arched with an almost semicircu- 

 lar transverse section. Almost in the middle of the distal margin of the basal 

 wall there is in numerous zooecia a rather strong spine (fig. 2 b), which may 

 grow longer than the zooecium, but is often very short. It seems to be quite 

 wanting however in other zooecia. There is very seldom a very short, external 

 corner-spine. The distal wall is insymmetrically angular (fig. 2 d), and somewhat 

 distally from this there is a ring-shaped constriction. 



The avicularia, which occur in very small number, are placed outside the 

 membranous frontal area in its proximal portion. 



The ooecia, the outer layer of which is calcified, are more than half the 

 length of the zooecia, elongated, strongly arched and marked with radiating 

 striae. They are placed obliquely relatively to the zooecia, and turned so much 

 outwards that they can be seen in the whole of their extent from the basal as- 

 pect of the colony. 



The segments (Kenozooecia) of the stem are, seen in transverse section, circu- 

 lar or perhaps slightly quadrangularly rounded. Here also we find two calcified 

 thickenings internally, arising from the distal wall and showing lines of growth. 

 They meet in a ring at the proximal end of the segment, but otherwise they 



