THE SKELETON 



77 



trace of a femur, but a vestigial femur is present in Halilhermm, 

 a fossil form. The hind-limbs are wanting among the Cetacea, 

 but in a few forms nodules of bone or cartilage may represent 



i.cnd.l 



Fig. 41. — Caudal Aspect of Femur. 



ex. tub. External tuberosity; int. tub, 

 internal tuberosity; ex, end, external con- 

 dyle; int. end, internal condyle; i, end, t, 

 intercondylar notch or fossa; inleh. r, in- 

 tertrochanteric ridge; g. Ireh, greater tro- 

 chanter; hd, head; lin, as, linea aspera; pit, 

 pit for the ligamentum teres; tr. fos, tro- 

 chanteric fossa or digital fossa. 



Fig. 42. — Anterior or Cra- 

 nial Aspect of Right Tibia. 

 at, Articulatory surface for 

 the ankle bone; er, crest; et, 

 external tuberosity; /c, facet for 

 articulation with the fibula; 

 im, internal malleolus; it, in- 

 ternal tuberosity; Ig, ligament of 

 the patella cut off; tb, tubercle. 



the femur. In most Perissodactyla and Rodentia, and in 

 some Insectivora and a few fossil Carnivora, a third trochanter 

 is present. 



