from Iceland and Labrador. 105 



others It takes on such shapes as are represented in Phite X. 

 figs. 11-14. 



[Arctic Sea {Smitt).'] 



Genus Cellepora, Fabricius. 



(CeUepo7'aria, Smitt.) 



19. Cellepora incrassata^ Lanik. 



This fine species, judging from the fragments which abounded 

 in the dredging, must be common off the coast of Iceland, as 

 it is, according to Smitt, in the seas about Spitzbergen and 

 Greenland. In Finmark it seems to be less abundant 

 East Greenland, plentiful (German Polar Exped.). 



20. Cellepoi'a ovata, Smitt. (PI. XL fig. 5.) 



Two fragments occur. 



[Spitzbergen, in 10-60 fathoms ; less common than C. 

 scabra and C. plicata [Smitt) ; Sabine Island (German Polar 

 Expedition).] 



In this species the mouth is orbicular, instead of triangular 

 as in the allied C. plicata, Smitt, and the avicularium much 

 shorter than in that species. The mucro is set completely at 

 one side of the mouth. The surface of the cells, which are very- 

 convex and regularly ovate, is coarsely punctured, the spaces 

 between the punctures rising at times into ridges. The peri- 

 stome is thin and not at all elevated. 



Smitt, as Kirchenpauer has already noticed, ranks this form 

 with his Cellepora scabra in such a way that it is difficult to 

 determine whether he regards the two as specifically distinct 

 or not. From his description of the figures (p. 226) I should 

 infer that he looks upon these two forms and C. plicata as 

 merely varieties of one and the same specific type. Judging, 

 however, from those figures, as well as the Icelandic and 

 Labrador specimens, I have little hesitation in considering 

 C. ovata an independent species with well-marked features. 



Smitt, indeed (p. 188), refers to certain intermediate 

 forms by which, he thinks, the distinction between C. ovata 

 and C. jylicata is reduced to a very small matter — forms in 

 which the general appearance of G. ovata is combined with an 

 ovicell resembling that of C. plicata^ though wanting its 

 punctured surface, and a mouth which often suggests the three- 

 cornered shape* so characteristic of the aperture in the last- 

 named species; but as he does not figure these forms it is difficult 



* I am afraid this is a very free translation of the Swedish, '' och 

 dervid ser djurhusmyuuingarne jifven har fa en antjdan till trekant- 

 form ;'" but 1 hope it does not misrepresent its real force. 



