XVI 1 1. J 



CETACEA. 



of the skeleton of the hind limb. In the Greenland Whale 

 (Fig. 112), there is a proximal, somewhat pear-shaped bone 

 (/), about eight inches in length, and a smaller conical distal 

 bone (/), which may represent the femur and tibia respec- 

 tively, as suggested by their discoverer, Professor Reinhardt. 1 



c; 112. — Side view ol bones of posterior extremity of Greenland Right Whale 

 (Baieena mysticetus), |. from Eschricht and Reinhardt. i ischium ; /femur; 

 / accessory ossicle, probably representing the tibia. 



[n Megaptera longimana there is but one such bone, and in 



in adult Fin Whale {Balcenoptei-a muscidus\ sixty-seven feet 



mg, this was found to be only represented by an oval 



lodule of cartilage about the size of a walnut. Even this 



wanting in some species of the group, as B. rostrata. 



No trace of any structure representing the skeleton of 



le hind limb, beyond the pelvis, has yet been detected in 



my of the Odontocetes. 



In none of the existing Sirenia are there any rudiments 

 )f the hind limb proper, but the extinct Halitherium had an 

 )ssified femur, articulated to a well-defined acetabulum in 

 le pelvis. 



In the terrestrial and fossorial Edentata the femur is 

 generally short and broad. There is a third trochanter in 



1 See " Recent Memoirs on the Cetacea ; " Ray Society, 1866, p. 134. 



X 



