NO. 3 COMPARATIVE HISTOLOGY OF FEMUK TOOTE 97 



LEFT FEMUR OF TKICHOSURUS VUI.PECULA. PHALANGER. NO. 22804, 



AMRR. MiTS. NAT. TTTST. 



I'L. 0, Fig. ISi. Syn. Tab. V 



Autero-ijosterior diaiiietor of bone, 7 mm.; lateral, 7.o nun. 



Antero-posterior diameter of medullary canal, 4 mm.; lateral, 5 mm. 



The medullary canal is full. Medullary index, 61%. 



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

 straight canaliculi, interrupted by a few Haversian systems of the (la) and 

 (lb) differentiations and crossed radially by vascular canals. 



The bone shows very little differentiation of structure. The lione is uni- 

 form. 



Type I-III, la, lb. 



LEFT FEMTTE OF PHASCOLOMY'S I^RRINUS. WOMBAT. AMER. MUS. NAT. HIST. 



Pl. 9, Fig. 185. Syn. Tau. V 



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



Antero-posterior diameter of medullary canal, 4 mm.; lateral, 6 mm. 



The medullary canal is full. Medullary index, 11%. 



Struct lire. — The section is composed of several concentric rings of lamella' 

 with long lacmife and straiglit canaliculi surrounding the medullary canal. 



The rings of lamellfp are separated by small, crude Haversian systems of 

 the (la) and (lb) differentiations and crossed radially by many canals. The 

 posterior ridge is (h)ubl('. Tlie two ridges are comp()se<l of very crude Ha- 

 versian systems and inter-Haversian lamellae. Between tbem and forming the 

 posterior wall the structure is the same as elsewhere. 



The lacunae are long and oval and the canaliculi are long, straight, or busliy. 

 The bone shows but little ditferentiation of structure. 



Type I-III, la, lb. 



bight femur of LASIOPYGA KOLBI. AFRICAN MONKEY. NO. 27719, 

 AMEE. MUS. NAT. HIST. 



Pl. 0. Fig. 18(5. Syn. Tau. V 



Antero-posterior diameter of bone, 8.5 mm.; hiteral, 10 mm. 



Antero-posterior diameter of medullary canal, mm.; lateral, 7 niin. 



The medullary canal is full. Medullary index, 98%. 



Structure. — The section is composed of concentric lamella; with oval lacuna' 

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

 and (lb) differentiation enclosing the medullary canal. A few faii'ly well de- 



