from Iceland and Lahrador. 99 



Genus Membranipora, Dc Blainville. 

 7. Membranipora lineata, Linn. 



A single specimen, with ovicells, cliaracteristic, on Scrupo- 

 cellaria scahra. 



[South Labrador (Packard) ; coasts of Scandinavia, in 

 shallower water, common (Smitf) ; Finmark (Lov^n) ; Spitz- 

 bergen, a single specimen (teste JSmitt) ; Britain.] 



8. Membranipora craticula^ Alder. 

 On shell. 



[Sj)itzbergen, not rare [Smitt) ; Britain; Scotch Glacial 

 deposits {Geikic).'] 



9. Membranipora Sophice^ Busk. 



On shell. An arctic form first discovered by Dr. Sutherland 

 in Assistance Bay ; Spitzbergen, common in 30-50 fathoms 

 (SmiU). 



10. Membranipora cymbfrformisy n. sp. 



Membranipora spi/iifera, Smitt, Ivrit. Ftirteckn. ofver Skandmaviena 

 Hafs-liryozoer, pt. iii. pi. xx. fig. 32. 



Zoovcia oval, short, massive, of considerable depth, irre- 

 gularly disposed ; the margin with about eiglit to ten tall and 

 erect spines, two of which arc placed at the top of the cell ; 

 ai'icularia pedicellate, borne on a very long stem, very slender, 

 springing from the side of the cell, near the oral extremity ; 

 mandible acute, pointing upwards. Oooecium unknown. 



This form has been figured by Smitt under the name of M. 

 spiniftra ; but it is very distinct from Johnston's species, 

 which it seems to replace in the Arctic seas. 



The chief points in which it differs from our British form 

 are the much smaller size, the somewhat boat-like shape, and 

 the more massive character of the cells, and their irregular 

 arrangement, and the small number of its spines, which are 

 much taller and stouter and more erect than those of M. spini- 

 fera. 



In the latter the cells are elongate-oval, disposed in lines 

 with much regularity, and armed with sixteen or eighteen 

 spines, which, for the most part, bend inward over the mem- 

 branous area ; they are shallow and not calcified beloio^ the 

 flooring of the cell being simply membranous. But the cell of 

 M. cymbieformis is deep, inclosed by comparatively high walls, 

 which are well seen in the marginal zoooecia, and is furnished 



7* 



