CATALOGUE OF VERTEBRATES. 635 



URIA, Briss. 

 U. troile, L. Murre. Foolish Guiliemot. 



Upper parts dusky; white below; secoDdaries tipped with 

 white; bill compressed; upper mandible notched near tip; 

 chin, throat, fore-neck and sides of head velvety brown in 

 summer, white in winter, but sides of head not white in young ; 

 top of head and hind-neck smoky brown. Length, 15 to 18 

 inches; wings, 8 inches; bill, If inches. Breeds from Nova 

 Scotia northward. 



"About as abundant as the preceding. Met with during 

 autumn and winter, and seldom after the middle of March. 

 Remains always at sea." 



U. ringvia, Briinn. Murre. 



Same as above, but white ring around eye connecting with a 

 white streak behind eye. Perhaps not a distinct species. 



" Rather more abundant than the preceding, appearing off the 

 coast in November, and remaining until March. Like the pre- 

 ceding, remains at sea." 



U. lomvia, L. Brunnich's Murre. Thick-billed Guillemot. 



Top of head and hind-neck sooty black ; basal portion of 

 cutting edge of upper mandible light colored ; sides of head, 

 fore-neck, &c., snuff brown in summer. Length, 14 to 18 

 inches ; wings, 8 inches ; bill, 1 J inches. 



" Is probably not as common as the preceding, but is very 

 generally to be met with during the winter. Have seen them 

 quite abundant off Sandy Hook (December, 1863)."— [C. C. A.] 



ALOA, L. 

 torda, L. Razor-billed Auk. 



Bill deep, much compressed, and shorter than head ; tail feath- 

 ers pointed ; wings strong ; upper parts black ; tips of second- 

 aries and lower parts white ; in summer, head and neck (except 

 on top) velvety snuff brown ; white line (except in young) from 

 bill to eye ; bill crossed by white bar in middle, and with basal 

 lamina; in winter, no lamina, no white line to eye, and snuff 

 brown replaced by white. Length, 15 to 18 inches; wings, 8 



