160 



PROCEEDINGS OF THE ACADEMY OP 



[1883. 



Measurements. m. 



Length from apex of epiotic to end of ethmoid 



spine, inclusive, ....... 'OtS 



Length of ethmoid without spine (median), . . '018 

 Length of frontal bone (median), .... 'OSO 



Length of parietal (median), .... '0105 



Interorbital width, -028 



Width at pterotics, -040 



Width between apices of epiotics, .... '0245 

 Width of parasphenoid at middle of orbits, . . '0070 

 Diameter (long) of hyomandibular cot^lus of 



pterotic, -0070. 



The above measurements equal those of the largest size of the 

 Catostomiis teres of our waters. It will be desirable to compare 

 its skull with that of C. macrochilus Gird., which comes from the 

 Columbia River. Girard says that it is of more elongate propor- 

 tions than that of the C. labiatus. 

 Catostomus cristatus sp. n )V. 



This species is known to me from a skull, of which only the 

 cranium posterior to the anterior orbital region remains. It 

 belongs to the same elongate type as the C. reddingi, and differs 

 from that species as follows : — 



The lateral casts of the frontal bone are more elevated, and are 

 carried farther forwards. Instead of gradually diisappearing 

 anteriorly, they descend abruptly to their termination, enclosing 

 a groove with the supraorbital plate of the frontal. The fonta- 

 nelle is wide, and extends farther into the frontal bone. The low 

 median frontal ridge commences at its anterior border. The bridge 

 between the temporal and pterotic fossse is narrow. There is a 

 transverse ridge on each half of the supraoccipital bone ; in C. 

 reddingi this ridge is oblique, descending towards the middle line. 



Measurements. m. 



Length of parietal bone (median), . . . '014 



Length of frontoparietal fontanelle, . . . '023 



Width at ptei'otics, ...... '046 



Width between frontal crests at anterior extremi- 

 ties, -014 



Width between apices of epiotics, . . . "024 



Diameter (long) of hyomandibular cot^dus, . . '008 

 Found by J. L. Wortman in S. W. Idaho. One specimen only. 



