REPORT ON THE POLYZOA. 171 



Memhranipora monostachySy Busk. 



Memhranipora pilosa forma Monostachys, Smitt. 



Dredged on a stone in Liverpool Bay, by Professor Herd- 

 man. Not previously recorded in this district. 



Memhranipora catemdaria, Jameson. 



Hippothoa catenularia, Flem., Johnst., Busk. 



Isle of Man, dredged by Prof. Herdman. Not previously 

 recorded in our district. 



Memhranipora pilosa, Linnaeus. 



Flustra pilosa, Liun, Lamk., Flem. 

 Annulipora dentata, Gray. 



This species is found everywhere, and is the most 

 abundant form met with in our seas. 



The masses of sea-weed left by the tide at high-water 

 mark are frequently found covered with it. 



On Sertularians, it usually has the appearance of a brown 

 hairy covering, but when found on Laminaria, or red Algae, 

 it forms a beautiful silvery crust. 



Memhranipora memhranacea, Linn. 



Flustra membranacea, Linn., Ellis and Sol., Johnst., &c. 



Found mostly on Fuci, and is very generally distributed. 

 (Byerley). North Wales (Shrubsole). Hilbre (Marrat). It 

 is remarkable that this species, which is regarded as a very 

 common one, was not once met with among the specimens 

 collected during the present season. 



Memhranipora hexagona, Busk. 

 Flustra coriacea, Johnst. 



Found on shells and stones. Only a few localities have 

 been recorded where this species occurs, viz. : — Isle of Man 

 on Pecten opercularis (E. Forbes), and on the coast of 

 Devon (Miss Cutler), Peterhead (Peach). 



