NO. O COMl'AKATIVE HISTOl.OGY UK I'EMl'K FOOTE 101 



LEFT FEMUK OF HELICTIS OEIENTALIS. ASIATIC BADGKI:. XO. olHOG, 



AMER. Mrs. XAT. HIST. 



Pl. 10. Fid. 195. Syv. Tai!. V 



Antero-posteriov diameter of bone, 5.5 mm.; lateral, 4.5 mm. 



Antero-posterior diameter of medullary canal, 3.2 mm.; lateral, l'.5 mm. 



The medullary eanal i.s full. iVlcdnllary index, V29^/f . 



Structure. — The section is <'omy)osed of lamella* fre(|ii('iitly iiiU'rni|itcd liy 

 Haversian systems and crossed liy canals. Tlic laiiiella' have oval and hiiii; 

 lacuniE and straiuhl and Imshy canaliciili. 



Type I-III, C. 



RIGHT FEMUK OF CYNOCEPHALUS. BABOON. NO. 351"JU, AMEK. MTS. NAT. HIST. 



Pl. 10. Fic. I '.Ml. Syn. Tab. V 



Antero-posterior diameter of bone, IG mm.; lateral, 16 mm. 



Antero-posterior diameter of medullary canal, 10 mm.; lateral, 10 mm. 



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



Structure. — Tlie section is comjjosed of a wide ring- of external lamella', 

 interrupted by small, crude Haversian systems of the (la) differentiation and 

 by large spaces. The lacuna; are long and oval with long canaliculi. The ring- 

 forms nearly the whole width of the wall. Around the medullaiy canal the 

 internal circumferential lamellae form an enclosing ring wliich is partly can- 

 cellous. A few Haversian systems occur between the internal and external 

 lamelhe. In the posterior ridge Haversian systems, separated by lamelkx) with 

 o\i\\ lacuna', constitute the structure. 



Type I-III, la, lb. 



EIGHT FEMUK OF CYNOCEPHALUS MAIMON. MANDRILL. NO. 'I'lSll , 

 AMEK. MUS. NAT. HIST. 



Pl. 10, Fig. 197. Syx. Tab. V 



Antero-posterior diameter of bone, 13 mm.; lateral, 11.5 mm. 



Antero-posterior diameter of medullary canal, 8 mm. ; lateral, 8 mm. 



The medullary canal is full. Medullary index, 75%. 



Structure. — The section is composed of two parts: a wide external cir- 

 cumferential ring of lamellae, interrupted by a few crude Haversian systems of 

 tlie (la) and (lb) differentiations, and a narrower internal ring of cancellous 

 bone. The lacunae are long and oval and their canaliculi are straight. The hone 

 shows but little differentiation of structure. 



Type I-III, la, lb. 



