642 mr. a. h. garrod on [June 17, 



portion of the tensor fasciae is very small or absent, and the accessory 

 semitendinosus is present in all but Bulweria bulweri. 



Species examined. 

 (Estrelata lessoni 1 Bulweria bulweri. 



Prion vittata. Puffinus anglorum. 



Daption capensis. 

 and some unnamed specimens. 



The Pygopodes consist of two distinct families. 



Among the ColymbidcB, Colymbus glacialis possesses the ambiens, 

 the femoro- caudal, the accessory femoro-caudal, the semitendinosus, 

 and the postacetabular portion of the tensor fasciae ; the accessory 

 semitendinosus is absent. 



The Podicipidce possess the accessory femoro-caudal, the semiten- 

 dinosus, and the postacetabular portion of the tensor fasciaa ; the 

 ambiens, the femoro-caudal, and the accessory semitendinosus are 

 absent. In these birds the semimembranosus is very thin in Podi- 

 ceps minor ; in specimens preserved in spirit I have not seen it, pro- 

 bably because it is so slender. 



Species examined. 



Podiceps cristatus. Podiceps novce-hollandice. 

 minor. 



The Alcidte possess the femoro-caudal, the accessory femoro- 

 caudal, the semitendinosus, and the postacetabular portion of the 

 tensor fasciae ; the ambiens and the accessory semitendinosus are 

 absent. 



Species examined. 



Alca torda. Arctica alle. 



Uria troile. 



The Impennes possess the ambiens, the femoro-caudal, the acces- 

 sory femoro-caudal, and the semitendinosus ; the accessory semiten- 

 dinosus and the postacetabular portion of the tensor fasciae are absent. 

 In Eudyptes the insertion of the femoro-caudal is much nearer the 

 condyloid end of the femur than to the head. 



Species examined. 



Aptenodytes pennantii. Spheniscus humboldti. 



Spheniscus demersus. Eudyptes catarractes. 



The Crypturi possess the ambiens, the femoro-caudal, the acces- 

 sory femoro-caudal (which has a slip arising above the sciatic 

 foramen, found elsewhere only in the Struthiones), the semitendi- 

 nosus, the accessory semitendinosus, and the postacetabular portion 

 of the tensor fasciae. 



Species examined. 



Rhynchotus rufescens. Crypturus sallaei. 

 Crypturus obsoletus. noctivagus. 



