416 COLYMBID^E. 



appendages from four to five inches each. From the dif- 

 ference in the substance of the parieties of the stomach in 

 these two specimens, and particularly in the comparative 

 length of the cascal appendages, I was at first induced to 

 suppose that Montagu and the Editor of the last edition of 

 Pennants British Zoology were correct in considering the 

 Sclav onian Grebe distinct from the Dusky Grebe, but I am 

 now inclined to believe that though the specimen killed 

 in summer plumage was adult, the other was still an older 

 bird. I find the csecal appendages in Podiceps cristatus, 

 killed in its first winter, when six months old, only half an 

 inch long ; but in an old bird these appendages measure 

 two inches in length. 



The figure below is that of the young of the Great- 

 crested Grebe. 



together. Montagu, in his Supplement, states that he has observed the same oc- 

 currence in the Red-necked and Crested species. Are these to be considered as 

 analogous to bezoars?" 



; ;::^itf^r^ ! ' 



