NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



87 



LEFT FEMUR OF TAPHOZOUS PHILIPPINENSIS. NO. 144851, U. S. NAT. MUS. 



Pl. 8, Fig. 157. Syn. Tab. IV 



Antero-posterior diameter of bone, 1 mm. ; lateral, 1 mm. 

 Antero-posterior diameter of medullary canal, 0.5 mm.; lateral, 0.5 mm. 

 The medullary canal is full. Medullary index, 33%. 



Structure. — The section is composed of concentric lamellae with oval lacuna' 

 and straight canaliculi surrounding' the medullary canal. The lamellae are dimly 

 separated into external and internal rings. Incomplete twofold division. 



Type I. 



RIGHT FEMUR OF CHEIROMELES TORQUATUS. NO. 102462, U. S. NAT. MUS. 



Pl. 8. Fig. 158. Syn. Tab. IV 



Antero-posterior diameter of hone, 3.5 mm.; lateral, 2 mm. 

 Antero-posterior diameter of medullary canal, 1.5 mm. ; lateral, 1 mm. 

 The medullary canal is full. Medullary index, 27%. 



Structure. — The section is composed of concentric lamella? with narrow 

 lacuna? and long, straight canaliculi, divided into two distinct rings — external 

 wide and internal narrow — which surround the medullary canal. The internal 

 ring has very few lacunae. Twofold division. 



Type I. 



RIGHT FEMUR OF NOCTILIO. NO. 49545, U. S. NAT. MUS. 



Pl. 8, Fig. 159. Syn. Tab. IV 



Antero-posterior diameter of bone, 2 mm. ; lateral, 1.5 mm. 

 Antero-posterior diameter of medullary canal, 1.5 mm. : lateral, 0.9 mm. 

 The medullary canal is full. Medullary index, 82%. 



Structure. — The section is composed of concentric lamellae with oval lacunae. 

 In the outer wall there are a few minute canals surrounded by clear areas of 

 bone substance, around which oval lacunae with bushy canaliculi are assuming a 

 partial concentric arrangement. 



Type I-III, la. 



LEFT FEMUR OF PTEROPUS MOLOSSINUS (SMALL). NO. 151561, U. S. NAT. MUS. 



Pl. 8, Fig. 160. Syn. Tab. IV 



Antero-posterior diameter of bone, 2.5 mm.; lateral, 2.5 mm. 

 Antero-posterior diameter of medullary canal, 1.5 mm.; lateral, 1.5 mm. 

 The medullary canal is full. Medullary index, 56%. 



