76 SMITHSON'IAX COXTKim'TIOXS TO KNOWLEDGE VOL. 35 



The type of structure is iirst. The l)one substance is lamellated, the lacuna? 

 are round, oval or long, and the canaliculi are Imshy, short, or long. In some 

 of the large bats of the Pterojjus genus, Haversian canals of the (la) differ- 

 entiation are present. 



Detailed ExAMix.vnox 



EIGHT femur ok MORMOOPS. NO. 102231, U. S. NAT. MUS. 



Pl. 8. Fig. 113. Syx. Tar. IV 



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

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

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



.S7;»f/»re.^The section is composed of concentric lamellae with oval lacunae 

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

 Type I. 



EIGHT FEMUR OF RHINOLOPHUS MEHELYI. NO. 84768, IT. S. NAT. MUS. 



Vh. 8, Fig. lU. Syn. Tab. IV 



Antero-posterior diameter of bone, 0.8 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, 64%. 



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

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

 Type I. 



LEFT FEMUR OF STURNIRA LILIUM. NO. 115053, U. S. N.\T. MUS. 



Tl. 8, Fig. 115. Syn. Tab. IV 



Antero-posterior diameter of bone, 1 mm. ; lateral, 0.9 mm. 



Antero-posterior diameter of medullary canal, 0.5 mm.; latoi-al, 0.4 mm. 



The medullary canal is full. Medullary index, 29%. 



Structure. — The section is composed of concentric lamella' with long, nar- 

 row lacunae and long, straigld canaliculi surrounding the medulhiry canal. The 

 bone is uniform. 



Type I. 



RIGHT FEMI'R OK LDXCIIOH HI N A. \(i. 1 73S4!), U. S. NAT. MI'S, 

 t'l.. S. Fjc. 1 Ki, Sv\. Tm;. \y 



Antei'o-posterior diameter of Ixme, 0.!^) iiiiii.: lateral, (I.S mm. 

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

 The niedullarv canal is full. Medullarv index, 55%. 



