Yojj. 1] MerriaHl,. — A Primitive Ichthyosauria/n Limb. 



37 



ated than that of Mixosaurus. In the epipodial region, where 

 specialization of a high degree appears in the later members of 

 the order, we find a structure which is somewhat more primitive 

 than any which has previously been observed in the Ichthyo- 

 sauria. This is a particularly significant fact, when it is noted 

 that the beds in which this specimen was found are probably a 

 little older than those from which we have obtained the most 

 ancient known European specimens showing the limb structure. 



University of California. 

 February, 1905. 



