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SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 35 



veloped Haversian systems appear in the inner wall and several are found in 

 the posterior wall. The bone is uniform. 

 Type I-III, la, lb. 



RIGHT FEMUR OF TRAGCLUS JAVANICUS. JAVA MOUSE-DEER. NO. 14128, 



AMER. MUS. NAT. HIST. 



Pl. 10. Fig. 187. Syn. Tab. V 



Antero-posterior diameter of bone, 7.5 mm. ; lateral, 7 mm. 

 Antero-posterior diameter of medullary canal, 6.5 mm. ; lateral, 6 mm. 

 The medullary canal is full. Medullary index, 289%. 



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

 straight canaliculi incompletely separated into lamina?, interrupted by a few 

 Haversian systems of the (la) and (C) differentiations and crossed by canals. 

 In the posterior wall Haversian systems are most numerous. The lacuna? are 

 long and oval. The bone shows but little differentiation of structure. 



Type II- III, la, C. 



RIGHT FEMUR OF MUS SYLVATICUS. WOOD MOUSE. OR. MED. COLL. 



Pl. 10, Fig. 188. Syn. Tab. V 



Antero-posterior diameter of bone, 2 mm.; lateral, 3 mm. 

 Antero-posterior diameter of medullary canal, 1 mm. ; lateral, 2 mm. 

 The medullary canal is full. Medullary index, 50%. 



Structure. — The section is composed of lamelhe with round, oval, and long 

 lacunae and bushy canaliculi, separated into short bands which extend spirally, 

 concentrically, and radially along the walls. Here and there a few crude Ha- 

 versian systems appear. 



Type I-III, lb. 



LEFT FEMUR OF ERINACEUS EUROPiEUS. HEDGEHOG. AMER. MUS. NAT. HIST. 



Pl. 10, Fig. 189. Syn. Tab. V 



Antero-posterior diameter of bone, 3 mm. ; lateral, 6 mm. 

 Antero-posterior diameter of medullary canal, 2 mm. ; lateral, 2.5 mm. 

 The medullary canal is full. Medullary index, 38%. 



Structure.- — With the exception of the anterior wall, the section is sur- 

 rounded by bone substance with oval lacunae and bushy canaliculi. 



The body of the section is composed of bone substance with oval lacuna 3 

 and bushy canaliculi in which are Haversian systems of the (lb) differentiation. 

 In the anterior wall is a narrow concentric lamina. The posterior wall is very 

 much extended and composed of cancellous bone substance with oval lacuna?. 

 The internal circumferential lamellae are absent. 



Type I-III, lb. 



