1898-1902. No. a] BRYOZOA. 13 



September 19, 1900, off Forvisnings Valley, on alg£e ; Sept. 20, 1900, 

 the head of Gaase Fjord, on algae; July 5, 1901, the Sound, incrusting 

 stones; July 12, 1901, bay at Land's End; August 30, 1901, Gaase Fjord 

 on algee. 



This interesting Membranipora formed a dark brown incrustation 

 on algce and stones. On colonies from Gaase Fjord (August 30, 1901), 

 the length of the zocecia was from 0.78 to 0.97 mm., their breadth 

 0.39 mm. There are four polyporous rosette-plates on each side. There 

 are 2 rosette-plates (fig. 7) in the transverse walls, situated near the basal 

 wall. The ooecia were of various shapes. On all of them there was a 

 frontal part which was not calcified, and which was covered with a 

 membrane. At the bottom of the ooecium 2 small rosette-plates were 

 observed, through which the ocecium communicated with the zooecium 

 lying above it (fig. 8). The avicularia, which were at the distal end of 

 the zooecium, two on each side, had a pointed mandible. They are con- 

 nected by a rosette-plate (fig. 9) with the hollow of the zooecium. The 

 presence of a similar rosette-plate at the bottom of an avicularium has 

 been demonstrated by Levin-sen^ in Membranipora aurita, Hincks. 

 On the other hand I do not think a connection has been proved between 

 the ooecium and the zooecium above it, as is the case in M. nigrans. 



15. Membranipora cymbxformis, Hinhks. 



September 9, 1900, off Forvisnings Valley, 2—20 fath., on hydroids 

 and algae; Sept. 20, 1900, the head of Gaase Fjord, 3—20 fath., on 

 hydroids; July 8, 1901, Ren Bay, on algae; July 12, 1901, bay at Land's 

 End, on algae. 



16. Membranipora trifolium, S. Wood. 



July 22, 1900, the neighbourhood of the winter haven, incrusting 

 stones; July 12, 1901, bay at Land's End. 



Gen. Cribrilina, Gray. 



17. Cribrilina annulata, Fabr. 



Syn. BiDENKAP kat., p. 18. 



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

 July 12, 1901, bay at Land's End, two small colonies on algae; August 

 30, 1901, Gaase Fjord, 8 m., on algae. 



' Fauna danica, Bryozoa, PI. 4, fig. 35. 



