I.ÖNNBERG, ON A NEW ORYCTEROPUS FROM NORTHERN CONGO. 19 



The already rudimentary iieural arch disappears behind 

 the 13th vertebra in O. erikssoni. Tn O. af er it must be vari- 

 able. In one skeleton the last rndiment of a neural canal 

 is seen on the lOth and in another on the 12th vertebra, but 

 OwEN says that it »disappears upon the sixteenth caudal 

 vertebra». 



IFig. 6. b. Scapula of O. erikssoni. from inner side. \/2 nat. size. 



The different limb-bones of Or erikssoni differ also al- 

 ways in size and of ten in shape from the corresponding ones 

 of O. afer. 



With regard to the scapula it is apparent that the acro- 

 mion is longer in O. erikssoni (fig. 6). The anterior contour 

 is also very different (fig. 6). In O. afer the distan ce from 

 the lower side of proc. coracoideiis to the upper end of the 

 concave portion of the anterior contour is a little longer 



