no. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



77 



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

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

 Type I. 



LEFT FEMUR OF ROUSETTUS AMPLEXICAUDATUS. JSTO. 175844, U. S. NAT. MUS. 



Pl. 8, Fig. 117. Syn. Tar. IV 



Antero-posterior diameter of bone, 2.5 mm. ; lateral, 2 mm. 

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

 The medullary canal is full. Medullary index, 44%. 



Structure. — The section is dimly separated into three concentric divisions, 

 external, central, and internal. The external and central divisions have lamellae 

 with long, narrow lacunae and straight canaliculi, while the internal division has 

 lamellae with oval lacuna? and bushy canaliculi. The bone shows the threefold 

 division. 



Type I. 



RIGHT FEMUR OF HIPPOSIDEROS LARVATUS. NO. 152076, U. S. NAT. MUS. 



Pl. 8, Fig. 118. 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 separated into external, central, and internal rings which 

 surround the medullary canal. The bone is uniform. 



Type I. 



LEFT FEMUR OF HEMIDERMA. NO. 123744, U. S. NAT. MUS. 



Pl. 8, Fig. 119. 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 bushy canaliculi surrounding the medullary canal. The bone is uniform. 

 Type I. 



LEFT FEMUR OF DESMODUS ROTUNDUS. NO. 114977, U. S. NAT. MUS. 



Pl. 8, Fig. 120. Syn. Tab. IV 



Antero-posterior diameter of bone, 1.5 mm. ; lateral, 2.5 mm. 

 Antero-posterior diameter of medullary canal, 1 mm. ; lateral, 2 mm. 

 The medullary canal is full of red marrow. Medullary index, 129%. 



