40 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 35 



V 



Structure. — The section is triangular in shape and composed of lamellae 

 with round and oval lacunas and long canaliculi, divided into wide external and 

 narrow internal rings. A vascular canal is seen in the posterior wall. The in- 

 ternal ring forms the internal circumferential lamella 3 . Twofold division. 



Type I. 



BIGHT FEMUB OF HYLA GBATIOSA. NO. E 40 14, U. S. NAT. MUS. 



Pl. 2. Fig. 14. Syn. Tab. I 



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

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

 The medullary canal is full. Medullary index, 44%. 



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

 and bushy canaliculi surrounding the medullary canal. A narrow lamina, not 

 parallel with the external or medullary surfaces, forms a complete ring around 

 the section. It approaches the medullary surface in the lateral wall and departs 

 from it in the anterior and posterior wall. 



Type I-Il 



RIGHT FEMUB OF DENDBOBATES TINCTOBIUS. NO. E 14 36, U. S. NAT. MUS. 



Pl. 2, Fig. 15. Syn. Tab. I 



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

 Antero-posterior diameter of medullary canal, 0.2 mm. ; lateral, 0.2 mm. 

 The medullary canal is full. Medullary index, 15%. 



Structure. — The section is composed of lamellae with long, narrow lacunae 

 and long, straight canaliculi, divided into wide external and narrow internal 

 rings. The internal ring forms the internal circumferential lamellae. Twofold 

 division. 



Type I. 



BIGHT FEMUR OF LEPTODACTYLUS ALBILABBIS. G 13 11, U. S. NAT. MUS. 



Pl. 2. Fig. 1(3. Syn. Tab. I 



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

 Antero-posterior diameter of medullary canal, 0.8 mm. ; lateral, 0.3 mm. 

 The medullary canal is full. Medullary index, 59%. 



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

 straight canaliculi, divided into wide external and narrow internal rings. The 

 internal ring forms the internal circumferential lamellae. Twofold division. 



Type I. 



