10 0. NORDGAARD. [2nd ARC. EXP. FRAM 



The species was previously known from Franklin Pierce Bay (Busk), 

 Inglefield Gulf (Hennig), the Kara Sea (Levinsen). It thus appears to 

 belong to those species of which the occurrence in the east arctic waters 

 is rare. 



Gen. Membranipora, Blainville. 



10. Membranipora, catenularia,, Jameson. 



Syn. BiDENKAP kat, p. 5. 



July 22—25, 1900, the neighbourhood ot the winter haven, small 

 chains upon rock. 



11. Membranipora craticnla, Alder. 



Syn. BiDENKAP kat., p, 13. 



July 22, 1899, the winter haven, 8 fath., on aigce. 



July 22, 1900, the neighbourhood of the winter haven; July 8, 1901, 

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

 July 12, 1901, bay at Land's End, on algae. 



This species was not of infrequent occurrence among the specimens, 

 but I could not find any form that I could with certainty classify as 

 M. lineata, Lin. 



Dr. Hennig 1 states that the frontal area in specimens from west Green- 

 land, measured 0.34 mm. in length, and 0.18 mm. in width. In colonies 

 from the bay at Land's End (July 12, 1901), I found the corresponding 

 measurements to be 0.33 and 0.21 mm. 



12. Membranipora arctica, D'Orbigny. 

 Syn. Norman, Ann. Mag. Nat. Hist, ser. 7, vol. 11, p. 590. 



July 15, 1902, off Havhest Mountain, N. Devon, incrusting stones. 



Norman (1. c.) designates this species as Callopora SopMce, Busk, 

 setting a note of interrogation to Reptoflustrina arctica, D'Orb. 

 Waters-, however, in a later work, makes it probably that D'Orbigny's 

 species from Spitsbergen is the one that Smitt, Lorenz and others have 

 described from arctic regions. (See also i-emarks of Waters in Journ. 

 Linn. Soc, vol. 28, p. 60.) It must therefore surely be right to employ 

 the name that D'Orbigny gave. I have also found this species in the 

 north of Norway. In specimens from Svaerholt in Finmark, the frontal 



' Ofvers. Kg]. Vet. Akad. F6rh., 1896, p. 356. 

 2 Ann. Mag. Nat. Hist., Ser. 7, vol, 15, p. 12. 



