1892.] NATURAL SCIENCES OF PHILADELPHIA. 149 



The nieasuremeuts of the series give the following results: 



9. Rissa tridactyla (Linn). Kittiwake, 



Two specimens of Kittiwake were collected July 16, in Melville 

 Bay, Lat. 75° 09' N. They measured as follows: 



10. Larus glaucus Brunn. GIouoous Gull. 

 One specimen shot at Disco Island. 



11. Fulmarus glacialis (Linn.) Fulm.ir. 



Eight Fulmars are in the collection, all obtained in Melville 

 Bay, July 7 to 13. Five are in the white phase of plumage and 

 three in the gray phase. They all seem to be typical F. glacialis, 

 the measurements being as follows : 



12. Somateria mollissima borealis Brehm. Greenland Eider. 



Five male Eider Ducks and an equal number of females were 

 collected at Duck Island, Lat. 73° 57' N., July 2. They appear to 

 be referable to S. mollissima borealis Brehm, but the measurements 

 of the bill are rather different from those given in Ridgway's 

 Manual. In the key to species on page 109 this race is placed in a 

 division with the true S. mollissima headed "Distance from anterior 

 point of loral feathering to extremity of naked angle on side of 

 forehead much greater than from same point to Lip of upper 

 mandible." In the present series, however, the reverse is the case 

 or else the two measurements are about equal. As these specimens 

 were taken in the upper part of Baffin Bay, they represent the 

 extreme northwestern form of the S. mollissima stock and are 

 farthest removed geographically from typical S. mollissima. 



It is, therefore, not surprising that they should exhibit the greatest 

 differences from the typical S, mollissima and it is probable that 



