82 bicellaeildtE. 



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. 



BuGULA CALATHUs, Norman. 

 Plate XI. figs. 4-6. 



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

 figs. 3-8. 



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. Zomcia 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 strife, 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. Ocecia 

 subglobular, rather large, with a smooth and polished 

 surface, slightly thickened round the edge in front. 



Height of a large specimen | inch, diameter \\ inch. 



Habitat. Under stones between tide-marks and in shallow 

 water. 



Localities. Herm, between tide-marks (A. M. N.) : oflF 



