84 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 35 



RIGHT FEMUR OF MEGADERMA SPASMA. NO. 114272, U. S. NAT. MUS. 



Pl. 8, Fig. 145. 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. The lamella? are divided into wide external and narrow 

 internal rings which partly surround the medullary canal. The internal ring is 

 limited to the lateral walls. The bone shows a partial twofold division. 



Type I. 



RIGHT FEMUR OF PTERONOTUS. NO. 113570. U. S. NAT. MUS. 



Pl. 8, Fig. 140. 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 lamellae with oval lacuna? 

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

 Type I. 



LEFT FEMUR OF BALAN TIOPTER YX PLICATA. NO. 142606, U. S. NAT. MUS. 



Pl. 8, Fig. 147. Syn. Tab. IV 



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

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

 The medullary canal is full. Medullary index, 56%. 



Structure.- — The section is composed of a few concentric lamella? with round 

 and oval lacuna? and busby canaliculi surrounding the medullary canal. The 

 bone is uniform. 



Type I. 



right femur of saccopteryx. no. 123800, u. s. nat. mus. 



Pl. 8, Fig. 148. Syn. Tab. IV 



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

 Antero-posterior diameter of medullary canal, 0.4 mm. ; lateral, 0.3 mm. 

 The medullary canal is full. Medullary index, 18%. 

 The bone is flat on the posterior side. 



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

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

 Type I. 



