Ascidiacea 13 B 



Goniocarpa rustica (L.) 



See VAN NAME (1912, p. 549 as Tethyum rusticum) and REDIKORZEW (1916, 

 p. 229) for description and literature. 



Station 23, 1 specimen. Beach at Winter harbour, Melville island, 1909, 

 .coll. F. Hennessey, Canadian Fisheries Museum, 1 specimen (test only). West 

 coast of McClintock island, Franz Josef land, (80 22' N. lat.), July, 1902, 

 Baldwin-Ziegler expedition, U. S. Nat. Mus., No. 6640, 2 specimens. Aberdare 

 channel, east of Alger island, Franz Josef land, June, 1901, Baldwin-Ziegler 

 expedition, U. S. Nat. Mus. No. 6639, 2 specimens. 



This species occurs throughout the arctic, and its distribution extends into 

 the subarctic in the north-western Pacific and on both sides of the Atlantic. 

 The present records assist in demonstrating its circumpolarity, being the first 

 for the region between Bering sea and Jones sound off Baffin bay (Bjerkan, 

 1908 a, p. 6). 



Boltenia echinata (L.) 



See VAN NAME (1912, p. 523 as Pyura echinata), HUNTSMAN (1913, p. 163, 

 as B. arctica) and REDIKORZEW (1916, p. 154) for description and literature. 



Station 23, 10 specimens. South gate, northwestern Spitsbergen, (79 40' 

 N. lat.), 7 fathoms, coll. E. Wilkinson, U. S. Nat. Mus. No. 5971, 1 specimen. 



These arctic specimens exhibit the characteristic spines (elongated axis and 

 definite whorl of short branches) of the more northern form of this widely dis- 

 tributed species, and differ, therefore, from the subarctic form, which has shorter, 

 irregularly branched spines. 



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