82 BICELLARIIILE. 



hibit any very marked peculiarity. It is to some extent 

 intermediate between that of B. avicularia and B. turbinata, 

 not so broad and round at the back as the latter, nor 

 provided with such an elongated beak as the former. The 

 ovicells are extremely delicate in texture, bright and 

 hyaline, and without a trace of sculpture. 



B. flabellata attains a height of about one inch. 



BUOULA CALATHUS, Norman. 

 Plate XI. figs. 4-6. 



BUGULA CALATHUS, Norman, Quart. Journ. Micr. Sc. (n. s.) viii. 218, pi. vi. 

 figs. a-8. 



Zoarium composed of a number of dichotomously divided 

 branches, springing from a fibrous base, and spreading 

 out regularly on all sides, so as to form a shallow cup ; 

 when dried of a yellowish horn-colour. Zoaecia multi- 

 serial (3-9 rows) , oblong, equally wide throughout, with 

 two spines at each angle above (commonly three at the 

 outer angle on the edge of the segments) . Avicularia 

 on the outer cells very large, on the inner small, placed 

 about a third of the length of the cell from the top, 

 sometimes about halfway down, elongate; the head 

 much produced behind, not much arched above, marked 

 with delicate striae, which pass off on each side from 

 the median ridge ; the beak short in proportion to the 

 head, bent, but not very abruptly, at the point. Ooecia 

 subglobular, rather large, with a smooth and polished 

 surface, slightly thickened round the edge in front. 



Height of a large specimen $ inch, diameter 1 inch. 



HABITAT. Under stones between tide-marks and in shallow 

 water. 



LOCALITIES. Herm, between tide-marks (A. M. N.) : off 



