170 MEMBRANIPORID^:. 



HABITAT. On stones and shells in deep water. 



LOCALITY. Shetland (Barlee) : ibid., in 40-1 70 fathoms, 

 common ; " the most abundant species in deep water, it 

 encircles the dead shells of Dentalium and Ditrvpa with 

 its polyzoary" (A. M. N.). 



GEOGRAPHICAL DISTRIBUTION. Finmark (Loven) : East 

 Greenland (North Germ. Polar Exped.) : Bergen (A. M.N.). 



In the original account of this species the name rhyn- 

 cota found its way through some oversight into the 

 description of the figures. Of course, the name in the 

 text would naturally have precedence ; and Mr. Busk has 

 since given the other to a very different species, in his 

 ' Monograph of the Crag Polyzoa/ 



Smitt seems to have confounded two very distinct forms 

 under his M. Flemingii forma minax. The one repre- 

 sented in his plate xx. fig. 44, with the remarkable avicu- 

 larium recalling that of Bugula Murrayana, can hardly 

 be referred to Busk's species. 



MEMBRANIPORA NODULOSA, Hincks. 



Plate XX. fig. 9. 

 MEMBRANIPORA NODULOSA, Hincks, Ann. N. H. ser. 4, xx. 213 (Sept. 1877). 



Zooccia small, oval, separate; margin continuous, slightly 

 raised, granular, unarmed ; more than half the area 

 covered in by a minutely granular calcareous lamina ; 

 aperture occupying rather more than a third of the area, 

 arched and somewhat contracted above, lower margin 

 almost straight ; at the base of each cell a very large, pro- 

 minent, smooth nodule, usually subtriangular in shape. 

 Ooecia very small and shallow, rounded, smooth. 



Colonies forming small and very inconspicuous crusts. 



