42 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 35 



EIGHT FEMUE OF KANA AKEOLATA CIECULOSA. NO. F 72 3, U. S. NAT. MUS. 



Pl. 2, Fig. 21. Syn. Tab. I 



Antero-posterior diameter of bone, 2 mm. ; lateral, 2 mm. 



Antero-posterior diameter of medullary canal, 1.5 mm. ; lateral, 1.4 mm. 



The medullary canal is full. Medullary index, 110%. 



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

 and bushy canalieuli surrounding the medullarj' canal. The bone is uniform in 

 structure. A portion of the nutrient canal is seen. 



Type I. 



EIGHT FEMUE OF RANA AGILIS AUEOEA. NO. F 50 10, U. S. NAT. MUS. 



Pl. 2, Fig. 22. Syn. Tab. I 



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 lamellae with oval lacunae and 

 straight canalieuli surrounding the medullary canal, and divided into dim, wide 

 external and narrow internal rings. Twofold division. 



Type I. 



EIGHT FEMUE OF EANA PEETIOSA. NO. F 75 11, U. S. NAT. MUS. 



Pl. 2. Fig. 23. Syn. Tab. I 



Antero-posterior diameter of bone, 2 mm.; lateral, 1.5 mm. 



Antero-posterior diameter of medullary canal, 1 mm.; lateral, 0.8 mm. 



The medullary canal is full. Medullary index, 41%. 



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

 and bush}' canalieuli, dimly separated into four or five concentric divisions. 

 In some portions of the section a few radiating canals are seen. 



Type I. 



RIGHT FEMUR OF EANA DRAVTONll. NO. F 70 14, U. S. NAT. MUS. 



Pl. 2. Fig. 24. Syx. T.\b. I 



Autero-posterior diameter of bone, 3 mm. ; lateral, 3 mm. 



Antero-posterior diameter of medullary canal, 1.5 mm.; lateral, 1.5 mm. 



The medullary canal is full and eccentrically situated. Medullary index, 

 33%. 



Structure. — The section is composed of lamellas with round and oval lacunae 

 and bushy canalieuli surrounding the medullary canal. The lacunae are gen- 

 erally arranged in conceniric rows and their bushy canalieuli extend outward 



