NO. 3 



COMPARATIVE HISTOLOGY OK FEMUR FOOTE 



101 



LEFT FEMUR OF HELICTIS ORIENTALIS. ASIATIC BADGE U . NO. 31806, 



AMER. MUS. NAT. HIST. 



Pl. 10. Fig. 195. Syn. Tab. V 



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

 Antero-posterior diameter of medullaiy canal, 3.2 mm.; lateral, 2.5 mm. 

 The medullary canal is full. Medullary index, 129%. 



Structure. — The section is composed of lamella? frequently interrupted by 

 Haversian systems and crossed by canals. The lamellae have oval and long 

 lacuna? and straight and bushy canaliculi. 



Type I III, C. 



RIGHT FEMUR OF CYNOCEPHALUS. BABOON. NO. 35120, AMER. MUS. NAT. HIST. 



Pl. 10. Fig. 196. Syn. Tab. V 



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

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

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



Structure. — The section is composed of a wide ring of external lamella 1 , 

 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 medullary canal the 

 internal circumferential lamella? form an enclosing ring which is partly can- 

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

 lamella?. In the posterior ridge Haversian systems, separated by lamella? with 

 oval lacuna?, constitute the structure. 



Type I-III, la, lb. 



RIGHT FEMUR OF GYNOCEPHALUS MAIMON. MANDRILL. NO. 22817, 

 AMER. MUS. NAT. HIST. 



Pl. 10, Fig. 197. Syn. 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 lamella?, interrupted, by a few crude Haversian systems of 

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

 bone. The lacuna? are long and oval and their canaliculi are straight. The bone 

 shows but little differentiation of structure. 



Type I-III, la, lb. 



