PERCOMOEPHI. 91 



Measurements. m. 



Total length 175 



Length of head 042 



Length to line of first dorsal 054 



Length to line of second dorsal 085 



Length to line of anal 091 



Length to caudal 140 



Depth at orbit 025 



Depth at first dorsal 037 



Depth at second dorsal 034 



Depth of caudal peduncle .020 



The scales are similar to those of the Jf. Idbracoides. 

 Twin Creek, Wyoming. 



MioPLOsus BEANi Cope. 



BuUetin U. S. Geol. Surv. Terrs., 1877, p. 816. 

 Plate XU, fig. 2. 



This, the most slender species of the genus, is represented by one speci- 

 men, which is the smallest obtained which is referable to this genus. The 

 depth enters the total length six times, and the depth at the fii'st anal spine 

 enters the length of the vertebral column a little more than four times. 

 Radii: D. IX— I. 13; A. 11—12; P. 13. Vertebra: D. 10; C. 15. The 

 general characters are as in M. Idbracoides, but the scales are not preserved 

 The form of the head is that of a younger fish, but its proportions as com- 

 pared with the body are not those of immaturity. The length enters the 

 total 4.2 times, and the orbit enters it 4.5 times. The profile of the front is 

 descending. The teeth of the inferior limb of the preopercle are obtuse 

 and not well defined. There are impressions of seven branchiostegals pre- 

 served. 



This Perch is named in honor of my friend Dr. T. H. Bean, of the 

 United States Fish Commission. 



Measurements. m. 



Totallength 131 



Length of head 031 



Length to line of first dorsal 040 



Length to line of second dorsal 064 



Length to line of anal fin 070 



Length to line of caudal fin 109 



Depth at orbit 020 



Depth at first dorsal ray 023 



Depth at first anal ray 019 



Depth of caudal peduncle Oil 



From Twin Creek, Wyoming. 



