NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



85 



LEFT FEMUR OF PETALIA. NO. 154866, U. S. NAT. MUS. 



Pl. 8, Fig. 149. Syn. Tab. IV 



Antero-posterior diameter of bone, 1 mm. ; lateral, 0.9 mm. 

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

 The medullary canal is full. Medullary index, 38%. 



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

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

 Type I. 



LEFT FEMUR OF MONOPHYLLUS. NO. 113677, U. S. NAT. MUS. 



Pl. 8, Pig. 150. 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 lacun:e 

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

 Type T. 



LEFT FEMUR OF VAMPYROPS LINEATUS. U. S. NAT. MUS. 



Pl. 8, Fig. 151. 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 lacunae 

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

 Type I. 



RIGHT FEMUR OF CTIILONYCTERIS. NO. 173842, U. S. NAT. MUS. 



Pl. 8, Fig. 152. 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 straight canaliculi surrounding the medullary canal. The bone is uniform. 

 Type I. 



