NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



53 



RIGHT FEMUR OF SCELOPORUS OCCIDENTALS. NO. I 74 3, U. S. NAT. MUS. 



Pl. 4. FlG. 53. Stk. Tab. II 



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

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

 The medullary canal is full. Medullary index, 24%. 



Structure. — The section is composed of lamellae with oval and long lacuna 1 

 and straight canaliculi surrounding the medullary canal. There is no dif- 

 ferentiation of structure. 



Type I. 



RIGHT FEMUR OF SCELOPORUS MAGISTER. NO. .1 71 '2, U. S. NAT. MUS. 



Pl. L, Fig. 54. Syn. Tab. II 



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

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

 The medullary canal is full. Medullary index, 19%. 



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

 and bushy canaliculi surrounding the medullary canal. There is no differentia- 

 tion of structure. 



Type I. 



RIGHT FEMUR OF CYCLUKA CARINATA. U. S. NAT. MUS. 



Pl. 4. Fig. 55. Syn. Tar. II 



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

 Antero-posterior diameter of medullary canal, 3 mm. ; lateral, 3 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. There is very little 

 differentiation of structure. The section is uniform. 



Type I. 



RIGHT FEMUR OF ANOLTS CRISTA TELLUS. NO. L 15 33, U. S. NAT. MUS. 



Pl. 4. Fig. 56. Syn. Tab. II 



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 two rings of lamellae, external and 

 internal. The external has long lacunae with straight canaliculi and the internal, 

 oval and round lacunae with bushy canaliculi. They are of nearly equal width. 

 There is very little differentiation of structure. The section shows the twofold 

 division. 



Type I. 



