330 APPENDIX. 



about three inches long, and rather narrow ; the 

 shell was of a light brown colour, the membraneous 

 edge of the sail scarcely blue. We caught, at the 

 same time, a Porpita. On the 1st of June, during 

 a calm, we caught a second Velella, the shell of 

 which and the sail in the membrane, had an oppo- 

 site direction to the first, which we caught on the 

 13th of May. The largest specimens were only 

 an inch and a half long ; the feelers, which in the 

 former were light brown, and blue only at the 

 end, had here a blue colour from the basis, and 

 the points reddish yellow. The shell was of a very 

 light yellow colour, and only the lower membrane 

 tinged blue on the edge. On this day, we also 

 caught siGlaiicics,wh.ich differed from Blumenbach's 

 G. Atlanticus only in being smaller. The follow- 

 ing day we saw a grey gull, (Procellaria Jiircata, 

 Pall.) flying about in great numbers. 



