DIASTOPOUA SARNIENSIS. 463 



Habitat. On shell and stone, and occasionally Algae, 

 shallow to deep water. 



Localities. Generally distributed on our coasts. 



Geographical Distribution. Bahusia (Loven) : Havo- 

 sund and Bergen (Sars) : Spitzbergen, 6-20 fms., on La- 

 minaria (Swed. Exped.) : Nova Zerabla, Jugor-scharr, 10- 

 14 £ms. ; Matotschkin-scharr, 2-5 fms. ; Kara Sea (Stux- 

 berg & Theel) : Greenland (Liitken) : off Bear Island 

 (Dutch Arctic Exped.) : Gulf of St. Lawrence (Dawson) : 

 Boscoff (Joliet) : Algiers (J. Y. J) : Adriatic (Heller) : 

 Naples, 6 fms. and deeper (A. W. Waters) . 



Range in Time. Postpliocene, Canada (Dawson). 



Diastopora Sarniensis, Norman. 

 Plate LXVI. figs. 7-9. 



Diastopora Sarniensis, Norman, Ann. N. H. ser. 3, xiii. 89, pi. xi. figs. l-G : 



Hincks, Suppl. Dev. Cat., Ann. N. H. ser. 4, viii. 81. 

 Diastopora iiyalina (part.), Smitt, loc. cit. 396. 



Zoarium forming an irregular crust, usually with a lobed 

 and sinuated outline, milk-white, rather coarsely punc- 

 tate, and often transversely striated, with a marginal ex- 

 tension of the basal lamina, and destitute of secondary 

 cells or tubules. Zooecia stout, disposed pretty regularly 

 in lines radiating from the centre, generally free and 

 suberect for a considerable portion of their length ; sur- 

 face not depressed or flattened, boundary lines incon- 

 spicuous, often almost obliterated ; orifice elliptical, oc- 

 casionally closed by an operculum, from the upper part 

 of which a small tube projects. Ooscia transversely 

 elongate, subelliptical inflations of the zoarium, of con- 

 siderable size. 



Zoarium sometimes | inch in diameter. 



The crust is thick in D. Sarniensis, the edge cellu- 



