2l8 Shufeldt on the Osteology of Cinclus ]\/cxica/i?is. 



The proximal extremity of the Jiumer?ts is very much expand- 

 ed, and rather abruptly bent in the direction of the bird's body, 

 the member being considered in a position of rest. The "crest" 

 we know curls over the usual site of the pneumatic fossa, which 

 depression is divided by a bony partition from a lesser cavity 

 above. This characteristic is also more or less strongly mai'ked 

 in the Rock Wren, Siunis^ and othei's, and is feebly shown in 

 Ha rporhyn ch i(S . 



The articular cavity of the shoulder joint is increased in the 

 Dipper by a good sized os Imniero-scapalare^ a sesamoid that we 

 are aware is to be found among other orders. 



We will present the reader here with a table showing the rela- 

 tive lengths, etc., of some of the bones we have thus far examined, 

 in order that a study of their comparative development may be 

 made. (The measurements are given in centimeters.) 



A o-reat many points of extreme interest and of the highest im- 

 portance reward the ornithotomist's study of the pelvic limb of 

 Cinclus; some of these the writer has alread}' remarked upon 

 in papers now in press, but he otTers them here again, confident 

 of the fact that they will be of interest to ornithologists generally, 



