Arctic Ascidians. 



By A. G. Huntsman 

 Biologist to the Biological Board of Canada 



The importance of the Ascidian material collected by Mr. Frits Johansen 

 of the Southern Party of the Canadian Arctic Expedition lies in the fact that it 

 was largely procured from a region whose Ascidian fauna was almost entirely 

 unknown, namely the western Canadian arctic and the arctic coast of Alaska. 

 The records that this material affords assist in demonstrating the actual circum- 

 polarity of a number of species. 



By courtesy of the United States National Museum it has been possible 

 to include in this report the results of the study of several small lots of Ascidians 

 in the Museum's collection and hitherto unrecorded. In addition there is 

 included a single record from arctic material of the Canadian Fisheries Museum.. 



The data for the stations of the Canadian Arctic Expedition at which 

 Ascidians were obtained by Mr. Johansen, as well as the names of the species 

 obtained at each place, are as follows: — 



Station 20 h and c. Grantley harbour, Alaska, 2-3 fathoms, sandy mud, July 

 30, 1913. 



Rhizomolgula globularis. 



Station 20 d. Grantley harbour, Alaska, beach, July 31, 1913. 

 Rhizomolgula globularis. 



Station 21, d, e, and g. East of Cape Lisburne, Alaska (68° 48' N. lat., 165° 

 10' W. long.), plankton tow, in surface, August 16, 1913. 

 Rhizomolgula globularis. 



Station 22. Southwest of Point Lay, Alaska, (69° 35' N. lat., 163° 27' W. long.), 

 11-12 fathoms, rock and sand, August 17, 1913. 

 Chelyosoma macleayanum. 



Station 23. Northeast of Icy cape, Alaska, (70° 24' N. lat., 161° 25' W. long.), 

 9-10 fathoms, mud and pebbles, August 19, 1913. 

 Trididemnum tenerum. 

 Didemnum albidum (?) 

 Chelyosoma macleayanum. 

 Cystingia griffithsii. 

 Goniocarpa lovenii. 

 Goniocarpa rustica. 

 Boltenia echinata. 



Station 27 d. Bay at Collinson point, Alaska, 0-1 fathom, gravel and tundra 

 debris, September 15, 1913. 



Rhizomolgula globularis. 



Station 27 s. Camden bay, Collinson point, Alaska, 3 fathoms, sandy mud and 

 gravel, October 3, 1913. 



Rhizomolgula globularis. 



41312—1* 



