10 B Canadian Arctic Expedition, 1913-18 



Station 28fc. Jan. 4, 1914. Camden bay, inside Collinson point, shallow water 

 under four feet of ice; water temperature 28°. 5 F. (F.J.) 



The following data are derived from Mr. Johansen's notes: — 



One adult Clione was 30 mm. long, the spread of the flippers 20 mm. 

 wnen alive. The muscles of the tail were clearly visible through the trans- 

 parent body. The purplish tint of the tail extended with decreasing in- 

 tensity forward for about 5 mm. The oral tentacles were aeep rose purple; 

 the oesophagus rose colour, as also the edge of the body around the base 

 of the parapodia; the intestinal mass was blackish -brown. The rest of the 

 body was pale and translucent. The protruded oral tentacles were about 

 3 mm. long, the hook bearing captacula when fully extended appeared 

 longer. 



When swimming, the parapodia were bent toward the ventral side, 

 returning to a nearly horizontal position, and repeating. 



The animal came up with the water in a hole cut through the ice and 

 was caught swimming just below the surface film of new ice. 



Placed in a bottle of sea water which began to freeze, the animal 

 became immobile among the ice particles. Only after arrival at camp 

 when the ice began melting did it begin to move again. The tail is much 

 used by the animal as a kind of rudder when changing direction of 

 movement. When moving up or down the tail is recurved dorsally or 

 sometimes ventrally. At times the animal would revolve in one place with 

 the tail curved against the side of the body and the fins continually 

 moving. When swimming horizontally it always tried to keep the ventral 

 sice downward. When at rest it remained in a vertical position, head 

 downward, or sank upon its ventral side to the bottom of the container. 

 The resting periods were always shorter than those of activity. The fins 

 if brought into contact with ice or the glass of the container, or when 

 the animal is moribund, are folded up and held close to the body. They 

 are subject to extreme contraction when placed in a preservative. 



In the warmth of the laboratory the movements decreased and the 

 animal became sluggish, but if the container was placed in a colder situation 

 activity revivea. From time to time the animal exuded mucus which 

 seemed to einbarrass its movements. On January 5, the container was 

 put in a cool' place and the water congealed during the night. When 

 thawed the Pteropod was still alive, though less active and this was con- 

 tinued for a week. January 12, it died, having been kept for eight days 

 without renewal of water or food. 



Station 37r. Inner harbour at Bernard harbour, Dolphin and Union strait, 

 Oct. 16, 1914. Under four inches of ice in about seven feet of water at a 

 temperature of 30°. 1 F. One adult Clione. (F.J.) 



Station 43a. Off Cockburn point, Dolphin and Union strait, September 13, 

 1915. Water temperature 32° F. about fifty fathoms deep. One Clione 

 obtained. (F.J.) 



In view of the fact that so many good dissections have been published of 

 this species, and that nearly all the specinions were immature and not in the 

 best condition, it is not thought worth while to attempt anatomical work upon 

 them. 



It may be noted that young are more deeply tinted than the adults and one 

 specimen of which Mr. Johansen has made a rough coloured sketch is quite 

 noticeably red, while others arc, less so. 



