NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



83 



LEFT FEMUR OF NYCTERIS BOREALIS. NO. 101945, U. S. NAT. MUS. 



Pl. 8. Fig. 141. Syn. Tab. IV 



Antero-posterior diameter of bone, 0.8 mm. ; lateral, 0.8 mm. 

 Antero-posterior diameter of medullary canal, 0.4 mm. ; lateral, 0.4 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 bone is uniform. 

 Type I. 



RIGHT FEMUR OF GLISCHROPUS TYLOPUS. NO. 142385, U. S. NAT. MUS. 



Pl. 8. Fig. 142. Syn. Tab. IV 



Antero-posterior diameter of bone, 0.5 mm. ; lateral, 0.4 mm. 

 Antero-posterior diameter of medullary canal, 0.3 mm. ; lateral, 0.2 mm. * 

 The medullary canal is full. Medullary index, 45%. 



Structure. — The section is composed of lamellae with round lacunae and 

 bushy canaliculi surrounding the medullary canal. The bone is uniform. 

 Type I. 



RIGHT FEMUR OF NYCTERIS CTNEREA. NO NUMBER, U. S. NAT. MUS. 



Pl. 8, Fig. 143. 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 lacunae 

 and straight canaliculi, divided into wide external and narrow internal rings 

 which surround the medullary canal. The bone shows a twofold division. 



Type I. 



LEFT FEMUR OF PHYLLO NYCTERIS. NO. 103501, U. S. NAT. MUS. 



Pl. 8, Fig. 144. Syn. Tab. IV 



Antero-posterior diameter of bone, 1 mm. ; lateral, 0.8 mm. 

 Antero-posterior diameter of medullary canal, 0.5 mm. ; lateral, 0.4 mm. 

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



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

 and straight canaliculi surrounding the medullary canal. The bone is uniform. 

 Type I. 



