104 



by Ilincks and Busk. The dislal wall is anf;ulaily l)eiil, and lo judgi' from the 

 slrucliiiT of these zoa'cia this species can he rct'erred neither lo Hiccllnria nor lo 

 Conmcopina. The sliiiclure of the oa»cia is not known. Tlic stem-segments have 

 a structure cjuite similar to tliat of llie last sptcies, and the above-expressed 

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

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

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

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

 gations, the radical libres quite agree with those in li. cdlicuhiht and have especi- 

 ally the same kind of pear-shajjed ex])ansions. 



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

 comes from Port Phillip, Australia. 



Bugula caraibica n. s\^. 

 (I'l. Ill, ligs. 2a-2n). 



The zotecia, which increase in width distally from the nari-ow ])roximal end, 

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

 frontal areas of two neighliouring zoa'cia form nearly a right angle with one 

 another, and they have thus, to judge from Kirkpa trick 's tigure, been subject 

 to a much smaller turning than the zoa'cia in B. Hmliloni. 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 zoo-cia a rather strong s|)iiie (fig. 2b), which may 

 grow longer than the zoo'ciuni, but is often very short. It seems to be (juite 

 wanting however in other zooecia. Theie 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 nu)ie than half the 

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

 striae. They are placed obliquely relatively to the zoa'cia, and turned so much 

 outwards that they can be seen in the wdiole 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 perhai)s slightly (juadrangularly rounded. Here also we find two calcified 

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

 They meet in a ring at the j)roximal end of the segment, but otherwise they 



