The Pteropoda Collected by the Canadian Arctic Expedition 

 1913-18, with description of a New Species from the 



North Pacific 



By William Healey Dall^ 

 Honorary Curator of Mollusks, United States National Museum. 



A small collection of Pteropoda was referred to me by the Arctic Pubiications 

 Committee for a request for a report upon them. They consisted mainly of 

 material collected by Mr. Frits Johansen, biologist with the Canadian Arctic 

 Expedition, with a few Opisthobranchs and other specimens added from other 

 northern Canadian localities. 



A peculiarity of the expedition series is the absence in great measure of 

 adult specimens, nearly all the specimens of Clione and all the specimens of 

 Spiratella {Limacina of authors), were young, especially the latter; although 

 Mr. Johansen frequently mentions its presence, not a single adult sj)ecimen is 

 contained in the series. As most of the specimens were obtained near shore, 

 it may indicate that it is the habit of the j^oung to avoid the open sea until 

 mature. 



Clione borealis Phipps. 



Station 6 a, h.^ Latitude 56° 26' N., longitude 133° W. June 24, 1913.— One 

 Spiratella and one young Clione obtained at the surface and near the sur- 

 face (F.J.). 



Station 9a. Latitude 55° 2' N., longitude 144° W., June 27, 1913. Water tem- 

 perature at 1 p.m. 51° to 51°. 6 F. Several young 'Clione and many 

 Spiratella. (F.J.) 



Station 12o, /. Latitude 54' 38° N., longitude 157° 45' W., June 30, 1913, 

 Water temperature 50°. 7 to 51°. 3 F. Many young CZione-and one Spiratella 

 from, at or near the surface. (F.J.) 



Station 14. Latitude 54° 23' N., longitude 164° 45' W., July 2, 1913. One 

 young Clione obtained at the surface. (F.J.) 



Station 57a. Cape Smyth, near Point Barrow, Alaska, August 5, 1916. Several 

 Clione were obtained at or near the surface in a strong northerly current. 

 (F.J.) 



Station 256, c. Ten miles east of Point Barrow, Alaska, off the Plover islands, 

 August 27-28, 1913. Water temperature 30°.2 to 30°.3 F. Depth about 

 two fathoms. One Clione obtained. (F.J.) 



Station 27c. Camden bay, inside of Collinson point, Alaska, September 15, 

 1913. Several Clione captured. (F.J.) 



Station 27u. Off Collinson point, Alaska, Oct. 5, 1913. One Clione from under 

 ten inches of ice in about six feet of water at a temperature of 30° 5 F. 

 (F.J.) 



1 By permiasion of the Director of the United States Geological Survey. 



2 The collecting stations are arranged in order from west to east. 



9b 



