82 



SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 35 



RIGHT FEMUR OF PLECOTUS AURITUS. NO. 152597, U. S. NAT. MUS. 



Pl. 8, Fig. 137. Syn. Tab. IV 



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

 Antero-posterior diameter of medullary canal, 0.5 mm. ; lateral, 0.4 mm. 

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



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 NYCTICEIUS HUMERALIS. NO. 115141, U. S. NAT. MUS. 



Pl. 8, Fig. 138. Syn. Tab. IV 



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

 Antero-posterior diameter of medullary canal, 0.6 mm. ; lateral, 0.5 mm. 

 The medullary canal is full. Medullary index, 116%. 



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

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

 uniform. 



Type I. 



RIGHT FEMUR OF MYOTIS MYOTIS. NO. 86500, U. S. NAT. MUS. 



Pl. 8. Fig. 139. 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 surrounding the medullary canal. The bone is uniform. 

 Type I. 



LEFT FEMUR OF EPTESICUS BAHAMENSIS. NO. 121929, U. S. NAT. MUS. 



Pl. 8. Fig. 140. Syn. Tab. IV 



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

 Antero-posterior diameter of medullary canal, 0.5 mm.; lateral, 0.4 mm. 

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



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

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

 Type I. 



