NO. d COMPAKATIVE HISTOLOGY OF FKMUK FOOTE U 



Structure. — The section is composed of concentric lamellaB with oval lacuna? 

 and straight canalicnli snrronnding' tlie medullary canal. The bone is uniform. 

 Type I. 



LEFT FEMUR OF ROUSETTUS AMPLEXIC.4.UDATUS. NO. 175844, U. S. NAT. MUS. 



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



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



Antero-postei'ior diameter of medullary canal, 1.5 mm. ; lateral, 1 mm. 



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



Str}(cture. — The section is dimly separated into three concentric divisions, 

 external, central, and internal. The external and central divisions have lameUa? 

 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. 



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



Pl. 8, Pig. 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 FEMUK 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 lacuna; 

 and bushy canaliculi surrounding the medullary canal. The l)one is uniform. 

 Type I. 



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



Pl. 8, Pig. 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 medullarv canal is full of red marrow. Medullary index, 129%. 



