80 SMITHSONIAN CONTKIBUTIONS TO KNOWLEDGE VOL. 35 



Structure. — The section is divided into two rings, an external composed of 

 lamellae with oval lacunae and bushy canaliculi, and an internal composed of 

 lamellae with long lacunae and straight canaliculi. Twofold division. 



Type L 



RIGHT FEMUR OF MINIOPTERUS SCHREIBERSII. NO. 152610, U. S. NAT. MUS. 



Pl. 8, Fig. 129. Stn. Tab. IV 



Antero-posterior diameter of bone, 0.8 mm. ; lateral, 0.7 mm. 

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

 The medullary canal is full. Medullary index, 64%. 



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

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

 Type I. 



LEFT FEMUR OF PROMOPS FOSTERI. NO. 105676, U. S. NAT. MUS. 



Pl. 8, Fig. 130. Syx. 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 VESPERT1LIO MURINUS. NO. 5333, U. S. NAT. MUS. 



Pl. 8, Fig. 131. Syn. Tab. IV 



Antero-posterior diameter of bone, 1.5 mm. ; lateral, 1 .5 mm. 

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

 The medullary canal is full. Medullary index, 12%. 



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

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

 Type I. 



RIGHT FEMUR OF MOLOSSUS NIGRICANS. NO. 8268, U. S. NAT. MUS. 



Pl. 8, Fig. 132. Syn. Tab. IV 



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

 Antero-posterior diameter of medullary canal, 0.7 mm. ; lateral, 0.8 mm. 

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



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

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

 Type I. 



