98 SMITHSONIAX CONTRIBUTIONS TO KNOWLEDGE VOL. 35 



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

 tlie posterior wall. The bone is nniform. 

 Type I-III, la, lb. 



RIGHT FEMUR OF TRAGULUS JAVANICUS. JAVA i\!OUSE-DEER. Nd. 14128, 



AMER. MUS. NAT. HIST. 



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



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



Antero-posteiior diameter of medullary eanal, 6.5 mm.; lateral, (i nun. 



The medullary eaual is full. IMedullary index, 289%. 



Structure. — The section is composed of lamella? with long lacunaj and 

 straight canaiiculi 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 lacun* are 

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



TjiDe II-III, la, C. 



RIGHT FEMUl! OF MUS SYl.V.ATICUS. W'ddH MOUSE. UR. MED. COLL. 



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



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



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



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



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

 lacuna? and bushy canaiiculi, 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 ERIXACEUS EUROPjEXJS. HEDGEHOG. AMER. MUS. NAT. HIST. 



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



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



Antero-posterior diameter of medullary canal, 2 muL; 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 lione substance with oval lacuna' and bushy canaiiculi. 



The body of the section is com]iosed of lionc substance with oval lacuna' 

 and bushy canaiiculi in wliicli 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 lacniRc. 

 The internal circumferential lamelhi? are absent. 



Type I-III, lb. 



