BRITISH ZOOPHYTES. 243 



between the Flustrce and the regular species of ilie?n- 

 braniporce. The cells are large, closely packed and 

 oval, armed with about a dozen large spines incurved. 

 Oval avicularia are scattered amongst the cells as in 

 Flustra. 



11. M. DiscEETA, Hincks. 



Hab. : South Devon, Guernsey (Hincks). 



This species was described by Mr. Hincks in the 

 Annals of N. H., ser. 3, ix. 200. 



From the description and figure of this species 

 (" Britieh Marine Polyzoa," plate six. figs. 8, 9), the 

 cells, which are small, appear to be veiy curious and 

 beautiful; " tlie margin being cut into about 20 lobes, 

 supporting as many delicate sharply pointed spines, 

 which bend slightly inwards," 



12. M. CURVIROSTRIS, Hiiicks. 

 Hab. : In deep waters off Polperro. 



Described by Mr. Hincks in the same publication as 

 the last species. 



It possesses " large avicularia, with curved and 

 pointed mandibles directed upwards." 



13. M. UNICORNIS, i^Zemm^. 



Flustra unicornis {Flem., De B.), Membranipora 

 membranacea, in part {G. J., D. L.). 



Hab. : Common. Northumberland and Durham 

 {Aid), St. Andrews {McL), Ayrshire coast {D. L.), 

 Dogger Bank (T. H.). 



This species forms extensive coarse gauze-like crusts 

 of a whitish colour. The cells are large and oval, with 

 two spines, one towards the upper part of each side. 

 There is a large avicularium borne at the summit of 

 each ovicel. 



14. M. DuMEEiLii, Audouin. 



B 2 



