66 



SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 35 



Left Wild Turkey 



Left Domestic Turkey, 

 18 lbs. weight .... 



LEFT FEMUR OF CENTROCERCUS UROPHAS1ANUS. SAGE GROUSE OR SAGE HEN. 



CR. MED. COLL. 



Pl. 5, Pig. 89. Syn. Tab. Ill 



Antero-posterior diameter of bone, 7 mm. ; lateral, 6 mm. 



Antero-posterior diameter of medullary canal, 6 mm. ; lateral, 5 mm. 



The medullary canal is empty. Medullary index, 252%. 



Structure. — The bone is composed of short, concentric laminae, with the 

 exception of a short, narrow crescent of poorly developed Haversian systems 

 in the posterior inner wall. The laminae are frequently crossed by canals. 

 Each lamina is composed of a few lamellae with long, narrow lacunae and long 

 canaliculi. In the posterior wall on both sides of the mid-line are two tendon 

 insertions which mark the attachment of muscles. 



Type II. 



FEMORA OF MELEAGRIS GALLIPAVO. WILD AND DOMESTIC TURKEYS. CR. MED. COLL. 



Pi. 6, Pigs. 90, 91, 914. Syn. Tab. Ill 



'Antero-posterior diameter of bone, 15 mm.; 



lateral, 17.5 mm. 

 Antero-posterior diameter of medullary 



canal, 10.5 mm.; lateral, 13 mm. 

 ^Medullary, index, 1091 



'Antero-posterior diameter of bone, 9 mm.; 



lateral, 11 mm. 

 Antero-posterior diameter of medullary 



canal, 7 mm.; lateral, 8 mm. 

 Medullary index, 1291 

 f Antero-posterior diameter of bone, 15 mm. ; 

 Left Domestic Turkey, lateral, 17 mm. 



32 lbs. weight <j Antero-posterior diameter of medullary 



canal, 13 mm.; lateral, 13 mm. 

 [Medullary, index, 194,1 



Since the three bones resemble each other closely, one description will 

 answer for all. The medullary canals are full and relatively large. The walls 

 of the bone are thin. Tbe index is higher in the domestic than in the wild 

 turkey. 



Structure. — External circumferential lamellae, with long, narrow lacunae 

 and many bushy canaliculi, surround the sections. Along the posterior ridges 

 of the femora are small areas of Haversian systems of the (Ic) differentiation 

 which occupy nearly the entire thickness of the posterior walls of the bones. 

 In the anterior walls are small areas of similar Haversian systems. The Ha- 

 versian canals are large, the lacunae are oval, and their canaliculi are numerous 

 and bushy. 



The lateral walls of the bones are composed of rather crude concentric 

 laminae, interrupted by a few Haversian systems of the (la, Ic) differentiations, 

 separated by prominent concentric canals and crossed at frequent intervals by 



