Natural History of East FinmarJc. 585 



Firsts as to incineration. Megapora ringens is the only 

 species which, when subjected to fire, has shrivelled up to 

 nothing, yet when treated with Eau de Javille it is found 

 to have a calcareous skeleton ; while Setosella vulnerata, 

 small as it is, has a strong calcareous front wall which resists 

 fire ; and Membranipora membranacea when burnt is shown 

 to have a well-developed calcareous structure. 



Secondly, it was a surprise to me to find that the largest 

 of all our Cheilostomata, Eschara foliacea, as also its variety 

 fascialis of the Mediterranean, when dissolved in nitric acid, 

 should exhibit scarcely a trace of chitin, less so than in any 

 other species which I have similarly treated. When the 

 calcareous matter is got rid of scarcely a sign of anything 

 is left except the opercula, which stand out entirely by 

 themselves, so that no teasing is required or indeed could 

 be applied. 



Genus Hincksina*, gen. nov. 



Zooecia incrusting, having the entire area membranous, 

 the margin surmounted by numerous spines, Ooecia small, 

 short, and little raised. Avicularia occupying distinct cells 

 sparingly scattered among the zooecia, oval, with semicircular 

 mandible. No pore-chambers. 



Type, Hinckshia {Membranipora) flustroides, Hincks. 



This genus with its separate avicularian cells and absence 

 of pore-chambers should, I think, be removed to the family 

 Flustridse. Waters mentions six lateral rosette-j)lates. 



Genus Membranipora, Lamouroux. 



Type, Membranipora membranacea (Linne) . 



The Flustra membranacea, Linne, has by general consent 

 been accepted as the type of this genus. No other species 

 placed in it by Hincks are congeneric or even belong to the 

 same family. A family Calloporidae with genus Callopora 

 as type will include most of the genera provided with pore- 

 chambers, &c. 



Front wall entirely membranous ; no ooecia ; no avicularia 

 (furnished with tower-cells of unknown use?). No pore- 

 chambers. No lateral spines. Rosette-plates two distal^ 

 and two to four lateral, with many pores (tVaters). 



31. Membranipora membranacea (Linne). 

 Nordkyn {Nordgaard). 



* After the author of ' Britisli Marine Polyzoa.' 



