118 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 35 



lamella\ The crescent nearly encircles the bone. The Haversian systems are 

 well developed, their lacuna^ are oval, and their canaliculi are relatively few. 

 Their canals frequently unite. In some places bands of lamelte cross the 

 crescent extending- from the outer to the inner lamelhe. Numerous canals 

 traverse the crescent. The internal circumferential lamellas form a wide, irregu- 

 lar ring, fusing with the external lamellas in the anterior wall. The lacunae 

 are long and narrow and their canaliculi are long and branching. 

 Type I-III, C. 



LEFT FEMIIK OF CRYl'TOPROCTA FEROX. C.\T-LIKE CIVET. AMEH. MI'S. NAT. HIST. 



Pl. 14, Fig. 235. Syn. Tab. VI 



Antero-posterior diameter of bone, 8.5 mm.; lateral, S nun. 



Antero-posterior diameter of medullary canal, 4.5 mm. ; lateral, 4.5 mm. 



The medullary canal is full. Medullary index, 42%. 



Structure. — The section is surrounded b}' a ring of external lamellaB of 

 varying widths. It is interrupted by numerous canals of the (la) differentia- 

 tion. The lacuna; are long and the canaliculi are straight. The ring is distinct 

 from the underlying central ring of Haversian systems, which are well devel- 

 oped. The medullary canal is surrounded by internal circumferential lamellae 

 of varying widths. 



Type I-III, la, C. 



RKiHT FKiAiri! OF HYTl'^NA CROCUTA. HYiENA. NO. .'55431, AMRR. MUS. NAT. HIST. 



Pl. 14, Fi(i. 33(). Syn. T.vi;. VI 



.Viitero-posterior diameter of bone, 14 mm.; lalei'al, IS nnu. 



Antero-posterior diameter of medullar}^ canal, 9 mm. ; lateral, 13.5 mnu 



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



Structure. — External lamellae form a wide ring around the section witli the 

 excei)tion of the outer ridge. The lamellae are crossed by canals, interrupted by 

 crude Plaversian systems of the (la) differentiation, and have long lacunae and 

 straight canaliculi. 



The central ring is comjjosed of well developed Haversian systems with 

 some inter-Haversian lamellae. The systems form the whole of the outer ridge, 

 where they are separated by bone substance with many oval lacunae and bushy 

 canaliculi. 



A narrow ring of internal circumferential lamellae surrounds the medullary 

 canal. The lacunae are long. 



Type I-III, la, C. 



