80 SMITHSONIAX COXTKIBX'TION:^ JO KNOWLEDGE VOL. 35 



Stiurtiiie. — The section is divided into two rinns, an external composed of 

 lamella^ with oval lacuna' and Imsliy canaliculi, and an internal composed of 

 lamella' with lony lacuna' and straiylil canaliculi. Twofold division. 



Type I. 



RIGHT FEMUR OF MINIOPTERUS SCHREIBERSII. XO. 152610, U. S. XAT. MUS. 



Pl. 8, Fig. 139. 8yx. Tab. IV 



Antero-posterior diameter of bone, 0.8 mm. ; lateral, 0.7 mm. 

 Antero-posterior diameter of medullary canal, 0.3 mm. ; lateral, 0.4 mm. 

 The medullary canal is full. Medullary index, 64%. 



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

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

 Type I. 



LEFT FEMTTR OF PEOMOPS FOSTEEI. NO. 105676, L". S. XAT. MUS. 



Pl. 8, Fig. 130. Stx. 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. 



LEFT FEMUR OF VESPERTILIO MURIXUS. XO. 5333, U. S. XAT. MUS. 



Pl. 8, Fig. 131. Syx. Tab. IV 



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

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

 The medullar}' canal is full. Medullary index, 12%. 



Structure.— T\\e section is composed of concentric lamelhe witli o\al lacuna' 

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

 Type I. 



RIGHT FEMUR OF MOLOSSUS XIGRICAXS. XO. 8268, U. S. XAT. MUS. 



Pl. 8. Fig. 133. Syx. Tab. IV 



Antero-posterior diameter of b(me, 1.5 mm.; lateral, 1 mm. 

 Antero-posterior diameter of medullary canal, 0.7 mm. ; lateral, 0.8 mm. 

 The medullary canal is full. Medullary index, 56%. 



Structure. — The section is composed of concentric lamella' with long lacunae 

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

 Type I. 



