NO. 3 COMPAEATIVE HISTOLOGY OF FEMUR FOOTE 83 



LEFT FEMUR OF NYCTERIS BORE.^LIS. NO. 101945, U. S. NAT. MUS. 



Pl. 8. ri«. 141. Syn. Tab. IV 



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

 Antero-po.sterior diameter of medullary canal, 0.4 mm. ; lateral, 0.4 mm. 

 The mediiUary canal is full. MeduUarj^ index, 33%. 



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

 and straight canaliculi surrounding' the meduUaiy 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 nun. 

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



Structure. — Tlie section is composed of lamellae with roinid lacunae and 

 bushy canaliculi suiTounding the medullary canal. The bone is unifonn. 

 Type I. 



RIGHT FEMUR OF NYCTERIS t'INEREA. 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 PHYLLONYCTERIS. 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 comjaosed of concentric lamellae with oval lacunae 

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

 Type I. 



