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 lamellfe with oval lacunae 

 and straight canaliculi surrounding the medullary canal. The lamellfe are dimly 

 separated into external and internal rings. Incomplete twofold division. 



Type I. 



BIGHT FEMUR OF CHEIROMELES TOEQUATCS. NO. 102462, V. S. NAT. MUS. 



Pl. 8, Fig. 158. Sy.v. Tab. IV 



Antero-posterior diameter of bone, 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 lamelhB with narrow 

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

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

 ring has very few lacunas. Twofold division. 



Type I. 



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



Pl. S, 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 lamellaj with oval lacunae. 

 In tlie 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). XO. 151561, U. S. N.\T. MUS. 



Pl. 8, Fig. IGO. Stx. 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%. 



7 



