103 



largest ones. In the largest the stalk or stem has a length of 31 mm., and the 

 cup a height of 75 mm. 



It is not quite clear to me whether the above-mentioned, quite young colonies 

 have arisen by budding from the older colonies, or whether they originate from 

 larvae which have attached themselves. The fact that they arise as a rule be- 

 tween two segments, whilst a single one of them issues from the frontal surface 

 of another zocecium in a somewhat young colony, speaks in favour of the first 

 view. While the one stem-segment in the very young colonies is very thin and 

 rather short, I have observed in various colonies, both in young and in somewhat 

 older, a thick and long, newly formed segment with a distinct terminal growth, 

 arising sometimes between two stem-segments, sometimes between a stem-segment 

 and the ancestrula, or between the two oldest zocecia (fig. 1 g). In these cases the 

 colony always seems to commence with the formation of a stem. 



A number of colonies of this species were collected at Hongkong in shallow 

 water by Captain Suenson. 



I originally believed this species to be identical with Stirparia Haddoni Kirk- 

 patrick\ and the figures of this species are therefore indicated by the latter 

 name on Plate III. A closer comparison with Kirkpatrick's description and 

 figures has however convinced me of the independency of the species here de- 

 scribed. St. Haddoni not only has no avicularia or spines, but differs further 

 from B. caliculata in the strongly arched basal surface of the zooecia, and their 

 strong turning inwards towards the middle-line of the branch. In both these 

 features B. Haddoni shows a great resemblance to the new species B. caraibica to 

 be described later. 



Bugula glabra (Hincks). 



Stirparia glabra Hincks, Annals, nat. hist. 5. S. Vol. XI, pag. 196, PI. VI, 



fig. 2. 



Bicellaria glabra (Bicellaria stylites in tabula) Busk, Challenger, Zoology, 



Vol. X, pag. 35, PI. VI, fig. 1 a. 

 Stirparia glabra Waters, Journ. Linnsean Soc, Zoology, Vol. XXVI, pag. 19 



(PI. Ill, fig. 3 a). 



I have examined a very young colony of this species with 8 stem-segments 

 and only 3 full-grown zooecia, in which the ancestrula has only 3 long spines 

 on each side, whilst a larger number (5—7) occur in the specimens examined 



» 49, p. 603. 



