18 



ARKIV FÖR ZOOLOGI. BAND 3. NiO 3. 



zygapop hyses, form the riidimentary processes on the upper 

 anterior part of the vertebrae. 



The number of caudal vertebrse is 27 as far as they have 

 been preserved but very Hkely at least one is missing at 

 the tip. 



In the two skeletons of O. ajer I have seen, 7 caudal 

 vertebrse articulate with prsezygapophyses but Owen ^ has ob- 

 served 8. 



Fig. 6. a. Scapula ot O. eriksfioni. from outer side. ^/a nat. size. 



The hsemapophyses are well developed under the greater 

 number of the caudal vertebrae. The most posterior rudiment 

 of such sits between the 21 th and 22d. In O. af er I have 

 seen the most posterior rudiment of hsemapophyses at the 

 17th vertebra. 



^ Anatoiny of Vei'tebrates. Vol. II p. 396. 



