Natural History of East Finmarh. 105 



Horrij vol. vi. Bryozoaires, i. p. 37), and Levinsen has in Lis 

 '' Studies on Bryozoa " mentioned a new genus Haplopoma, 

 to which he proposes to transfer Microporella impressa, 

 Audouin. 



Genus Microporella, Hincks, 1877. 

 Type, Microporella ciliata (Pallas). 



42. Microporella ciliata (Pallas). 

 Svserholt [Nordgaard) . 



43. Microporella arctica, sp. n. 



1809. Microporella ciliata, Smitt (partim), ''Kritisk Forteckuing, &c.," 

 (Efvers. Kougl. Vet.-Akad. Forbaud. p. 6, pi. xxiv. figs. 13-lG. 



Zocecia of considerably larger size than is usual in 

 M. ciliata. In a young condition the whole front wall is 

 brightly glistening and covered with large pores (Smittj 

 fig. 13) ; the crescentic suboral pore is scarcely, if at all, 

 larger than the other pores, and often cannot be seen at all. 

 The form of the oral opening is as in M. ciliata, and closest 

 examination generally fails to give the slightest evidence of 

 oral spines ; yet in the case of a few zocecia which were 

 situated in a very sheltered position, I have found four or 

 five very delicate spines. The ooecium is globose, and in 

 this early stage of growth is ornamented with radiating 

 riblets ; lateral avicularia are very sparingly developed, a 

 large portion of the polyzoary often not exhibiting any at 

 all. The description just given is that of the young zocecia 

 of a thoroughly healthy colony, but in zocecia at a little 

 distance from the margin overgrowth rapidly takes place, 

 choking up all the jaores and even the crescentic pore, and 

 smoothmg over the ooecium in such a way that the polyzoary 

 assumes the aspect of Smitt's fig. 14. 



Another form is that represented in Smitt^s fig. 16. The 

 adult zocecia have the surface granulated more or less 

 roughly, the crescentic pore remains open, and the lateral 

 avicularium is very rarely developed. 



The first form I have seen only on stones between tide- 

 marks at Vadso, where it is accompanied by Crihrilina 

 cryp)toa'cium, Harmeria scutulata, Porella minuta, &c. 



The second form was taken by the ' Valorous,' 1875, off 

 Holsteinborg, Greenland, in 57 fathoms, and was also sent to 

 me by Smitt very soon after the publication of his works as 

 " Poi'ina ciliana forma dura, Spitsbergen ''^. 



* It mii.«t be understood that these specimens were received thus 

 nauic'd before the publication of the last part (pt. v.) of his "Kritisk 



