132 PODICIPEDIDiE. 



tion of the internal parts of this specimen, as mentioned by 

 the Rev. L. Jenyns in his Manual of the British Vertebrate 

 Animals, page 253, was, " stomach membrano-muscular, 

 caecal appendages each one inch and a half in length." The 

 other figure, in the state, as to plumage, in which it has been 

 called the Dusky Grebe, was taken from a specimen obtained 

 in the London market in March, 1825, and which afterwards 

 formed part of the Author's collection. His note of the 

 internal appearance of this bird was, " stomach muscular, a 

 true gizzard, contained insects,* two long caecal appendages, 

 from four to five inches each." From the difference in the 

 substance of the parietes of the stomach in these two speci- 

 mens, and particularly in the comparative length of the 

 caecal appendages, the Author was at first induced to suppose 

 that Montagu and the Editor of the last edition of Pennant's 

 British Zoology were correct in considering the Sclavonian 

 Grebe distinct from the Dusky Grebe ; but he was subse- 

 quently inclined to believe that though the specimen killed 

 in summer plumage was adult, the other was still a more 

 mature bird. He found the caecal appendages in Podiceps 

 cristattis, killed in its first winter, when six months old, 

 only half an inch long ; but in an old bird these appendages 

 measured two inches in length. 



* Dr. Fleming, in his History of British Animals, page 132, says, "In the 

 stomach of a young male, shot 18th January, 1809, I found a concretion, 

 upwards of half an inch in diameter, consisting of its own belly feathers, closely 

 matted together. Montagu, in his Supplement, states that he has observed the 

 same occurrence in the Red-necked and Crested species. Are these to be con- 

 sidered as analogous to bezoars ? " 



