20 
Synopsis of the Birds 
Family Lobipedes. 
Genus 75. Podoa. Bill serrated. 
76. Podiceps Bill entire. 
Family Pygopodes. 
* Feet four-toed. 
77. COLYMBUS. 
** Feet three-toed. 
78. Uria. Bill nearly straight, pointed : nostrils half 
closed by a feathered membrane. 
79. Mormon Bill curved, exceedingly compressed, 
higher than long : nostrils half closed by a 
naked membrane. 
80. Alca. Bill curved, exceedingly compressed, 
longer than high : nostrils half closed by a 
feathered membrane* 
