NO. 3 COMPAKATIVE HISTOLOGY OF FEMUR FOOTE 163 



(C) differentiation. The central ring is composed of well developed Haversian 

 systems, separated in some places by laminae. Internal circumferential lamellas, 

 wide in some places and interrupted by Haversian systems of the (la) differen- 

 tiation, surround the central canal. 

 Type I-II-III, la, C. 



RADIUS OF NEGRO, NO. 248674, U. S. NAT. MUS. 



Pl. 24, Fig. 330. Stn. Tab. VIII 



Structure. — The section is surrounded by a wide horseshoe band of lamellae, 

 interrupted by scattering Haversian systems of the (la) and (C) differentia- 

 tions. The central ring, narrow and irregular, is composed of Haversian sys- 

 tems and inter-Haversian lamellae. The systems are well developed. Internal 

 circumferential lamellae of varying widths surround the central canal. 



Type I-III, la, C. 



HUMERUS OF NEGRO, NO. 248674, U. S. NAT. MUS. 



Pl. 34, Fig. 331. Stn. Tab. VIII 



Structure. — About half of the section is composed of lamellae, interrupted 

 by scattering, well developed Haversian systems and Haversian systems of the 

 (la) differentiation, and the remaining half of well developed Haversian sys- 

 tems. Internal circumferential lamellae form a ring of varying widths around 

 the medullary canal. 



Type I-III, la, C. 



clavicle of negro, no. 248674, u. s. nat. mus. 

 Pl. 24, Fig. 333. Stn. Tab. VIII 



Structure. — The section is about half surrounded by a wide band of la- 

 mellae and laminas, which alternate with concentric rows of Haversian systems. 

 The remaining half is composed of well developed Haversian systems, separated 

 in some places by short laminae. External and internal circumferential lamellae 

 form narrow rings around the bone and central canal. 



Type I-II-III, C. 



metatarsal bone of the great toe. negro, no. 248674, u. s. nat. mus. 



Pl. 34, Fig. 333. Stn. Tab. VIII 



Structure. — The inner one-half of the wall of the bone is composed of la- 

 melte with a few crude Haversian systems of the (la) differentiation. The 



