Vol. 5] 



Jordan. — The Fossil Fishes' of California. 



143 



Chasmistes batrackops (Cope). 



Cranium number three has a greater interorbital width and a 

 greater width across the pteroties and apices of the epiotics. The 

 region behind the supraoccipital which descends to the basioccip- 

 ital is wider and flatter. In general width, except in width of 

 ethmoid, this cranium approaches Catostomus or Chasmistes ba- 

 trachops Cope, with which it may be provisionally identified. 



Fig. 33. Chasmistes batrachops (Cope). Quaternary, Fossil Lake, Oregon. 



Our remaining fossil, Chasmistes or Catostomus, has only the 

 opercular region and the anterior part of the cranium remaining. 

 It is evidently close to numbers one and two. It is too fragmen- 

 tary to admit of any measurements being given to advantage. 



In the appended table the measurements of Catostomus occi- 

 dentalis and Chasmistes stomias show that all of these fossils are 

 nearer to the latter, though differing from it in many respects. 

 This does not necessarily mean that they belong to the genus 

 Chasmistes, although that is probable. 



