NO. 3 COMPARATIVE HISTOLOGY OF FEMUK FOOTE 85 



LEFT FEMUR OF PETALIA. NO. 15-1-866, U. S. NAT. MUS. 



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



Antero-posterior diameter of bone, 1 mm. ; lateral, U.9 mm. 

 Antero-postei-ior 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 lamellae with oval lacuna? 

 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, Fig. 150. Syx. 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. 

 Tlie medullary canal is full. Medullary index, 33%. 



Structure. — The section is com])osed of concentric lamellae with oval lacun.^ 

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

 Type T. 



LEFT FEMUR OF VAMPYROPS LINEATUS. U. S. N.AT. 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 coniijosed of concentric lamella; with oval lacuna> 

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

 Type I. 



RIUHT FEMUR OF CIIILON YCTERIS. NO. 173842, U. S. NAT. MUS. 



Pl. S, Fig. 153. Syn. Tab. IV 



Antero-posterior diameter of Ijone, 1 mm. ; lateral, 1 mm. 

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

 The medullary caual 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. 



