1898-1902. No. 8.] BRYOZOA. 37 



July 22, 1900, the winter haven, about 30 fath.; Aug. 4, 1900, 

 •olse Ness, 15—25 fath. 



The colonies from the winter haven were attached to Flustra serru- 

 lata. There were ooecia. The oral aperture of the zooecia was 0.13 mm. 

 in diameter, and the diameter of the tubules was about half that. In 

 Diastopora obelia, the diameter of the tubules is comparatively less. 



Gen. Lichenopora, Defrance. 



73. Lichenopora verrucaria, Fabr. 



July 22, 1900, the winter haven, upon algge ; July 8, 1901, Ren Bay 

 on algae; July 9, 1901, between Ren Bay and Cape Land's End; July 

 12, 1901, bay at Land's End, on aigas. 



The diameter of Ihe largest specimen was 5 mm. In several cases 

 the trumpet-like ocEciostome was observable. 



74. Lichenopora, crasiuscula, Smitt. 



Biscoporella crasiuscula, Smitt, Ofvers. Kgl. Vet. Akad. Forh., 1866, pp. 406 & 

 482, pi. 11, figs. 7-9. 



Lichenopora crasiuscula, Waters, Journ. Linn. Soc, vol. 29, p. 177. 



July 18, 1900, the winter haven; July 5, 1901, the sound; July 8, 

 1901, Ren Bay; July 18, 1901, the mouth of Gaase Fjord. 



Smitt states that the colonies of crasiuscula are rather raised, so 

 as to be almost hemispherical. I have compared colonies of Mspida 

 from By Fjord near Bergen and from the Trondhjem Fjord, with crasi- 

 uscula from the 2nd Fram Expedition, and have found that as a rule 

 Mspida forms thinner, more compressed colonies than crasiuscula. 

 The zooecia, moreover, in the latter, project less from the calcarous mass 

 than is the case in Mspida, which, on this account, appears to the 

 naked eye as if furnished with distinct radial ribs. 



In both forms, the walls of the pores are finely denticulated (stel- 

 late pores). 



The largest specimen of crasiuscula from the 2nd Fram Expedition 

 was 7 mm. in diameter. 



