BRITISH ZOOPHYTES. 267 



■with avicularia whicli are borne on distinct rectangular 

 interspaces between the cells. 



Genus II. Mastigophora, Hinchs. [fidari^, a whip, 

 and <^epu), I bear.) 



Zooecia with a semicircular orifice, the inferior margin 

 straight, with a central sinus; furnished with lateral 

 vibracula. Zoarium (in British species) incrusting. — 

 T. H. 



This genus differs from the preceding in that the 

 zocecia are armed with lateral vibracula instead of 

 avicularia. 



There are two British species, both obtained from 

 deep water. 



1. M. Dutertrei, Audouin. 



Flustra Dutertrei {Audouin, Savigny), Lepralia 

 Woodiana (Busk, McA., T. H.), L. aurita (Beuss), L. 

 otophora (Manzoni). 



Hab. : Cornwall {T. H".), Shetland (A. M. N.). 



The colonies are large. The zooecia are oval, minutely 

 punctured, with semicircular orifices, each having the 

 usual sinus in the lower margin. There are five spines 

 round the circular portion of the orifice, and on each 

 side is a slender vibraculum. In some forms there is 

 a row of distinct large punctures round the margin of 

 each cell. 



The ovicels are globular, punctured like the cells. 



2. M. Hyndmanni, Johnson. 



Lepralia Hyndmanni {G. J., D. L., Busk, McA.), 

 Herentia Hyndmanni ( 6^ra ?/),Hippothoa porosa {8mitt). 



Hab. : Sana Island {Eyndmav) Shetland {A.M.N.), 

 Peterhead (0. W.P.). 



This is a rare species found in deep water on the 



