PLATE 41 



241 



m^wmm 

 ^tilp^ 



^* 

 ^| 



242 



245 



241. Oxyhemo?lobin of the Sheep (Ovis aries), showing network produced by twinning and 



pentagon twins. 



242. Same, showing isolated pentagon twins in side and edge views. 



243. Same, showing composite groups produced by twinning. 



244. Same, showing cross-banded effect on pinacoid produced by twinning. 



245. Same, showing isolated pentagon twins strung like beads on needles of oxalate. 



246. Same, showing pentagon twins seen in polarized light. 



246 



