144 



University of California Publications. 



[Geology 



MEASUREMENTS OF CRANIA. 



In the following table in the first column under each specimen 

 are measurements in millimeters ; in the second are hundredths of 

 the length from the posterior end of the epiotic to the tip of the 

 ethmoid spine. Measurements under numbers 1 to 3 are of fossil 

 crania in our collection ; under number 4 are those published by 

 Cope of "Catostomus" batraeliops, and the hundredths measure- 

 ments are reduced from them ; under number 5 are measurements 

 of the existing species Chasmistes stomias Gilbert; and under 

 number 6 of the existing species Catostomus occidentalis Ayres. 





so 







so 



Sy 





so 



eo 



CO 



so 





60 







y. 



«0 





% 



&0 



=. 



O 



£ 5* 

 £ o 









CS 





i 



<= 



e 



c 

 Be 





Q 



Q 



c 



o-s 



•*J Oj 



l« 



ss 



Q 





tostc 



K 















o 





S3 





c 



a 







o 







O 



o 





O 





O 





O 



© 







1 









3 



4 







C 





Measurement 





J= 









J= 













00 



g 



o 

 o 





© 



s 



o 





O 



o 



a 



o 

 © 



a 



O 

 O 





a 





a 





a 





a 



rH 



a 





a 



*H 



Length from posterior 



























end of epiotic to tip 



























of ethmoid spine . . . 



83 





86 





*92 





84 





63 





49 





Length of ethmoid (me- 



























dian) without spine. . 



19 



24 



19 



23 



20 



22 



18 



22 





29 





23 



Length of parietal (me- 



























dian) 



16 



20 



17 



20 



17 



19 



15 



18 





20 





18 



Length of frontal 



32 



39 



35 



41 



35 



38 



32 



38 





41 





38 



Interorbital width .... 



45 



55 







55 



60 



56 



66 





65 





48 



Least width between 



























interorbital frontal 





























15 



18 



17 



20 



17 



19 









16 





23 



Greatest width across 



























pteroties *52 



*63 



51 



60 



64 



70 



*62 



*73 





60 





57 



Width between apices of 



























epiotics 



26 



32 



26 



31 



33 



36 



32 



38 





35 





24 



Width of ethmoid 



32 



39 



34 



40 



36 



40 



42 



49 





46 





31 



Approximately ; so broken that exact measurement cannot be given. 



Issued April 4, 1907. 



