90 THE WASATCH AND BKIDGER FAUNiE. 



lower jaw is not produced, but the inferior edge of the ramus is laminar and 

 acute ; the symphysis is shortly truncate. The superior edge of the maxil- 

 lary bears a supernumerary bone at its distal portion. There are six 

 branchiostegal rays preserved, with impressions of two others : the anterior 

 three are slender ; the others wide, as in allied genera. There is a low 

 supraoccipital crest. The abdomen bears fourteen rows of scales below the 

 vertebral column, and six rows may be counted above it ; on the caudal 



peduncle I count 5 — 5. 



Measurements. 



u. 



Total length 280 



Axial lengih of head 070 



Axinl length to lino of first dorsal spine 085 



Axial length to lino of first ray of second dorsal 143 



Axial length to lino of first anal spine 152 



Axial length to base of caudal 232 



Depth at orbit 051 



Depth at first anal ray 055 



Depth of caudal peduncle 030 



Length of third dorsal spine 030 



Length of second anal spine 016 



Abundant at Twin Creek, Wyoming. A single specimen from Green 

 River, Wyoming, from L. E. Ricksecker. 



MioPLosus LONGUS Cope. 



Bulletin U. 8. Geol. Sur v. Terra. , 1877, p. 815. 

 Plate XU, fig. 3. 



I have questioned the right of the form to which the above name is 

 given to be maintained as a species distinct from the M. labracoides. It is 

 represented by two individuals of much smaller size than those of the lat- 

 ter, and which are of a more elongate form. They have also two anal radii 

 fewer. 



The formulae are: D. IX— 12; A. II. 12. Vertebrje: D. 10; C. 15. 

 The depth at the first dorsal fin enters the total length five times, and the 

 depth at the first anal ray three and one-half to three and eight-tenths 

 times. The dorsal spines are straight and slender, the posterior ones very 

 short. The caudal is forked. The teeth of the inferior border of the pre- 

 operculum are strong and acute; there are three large and two small ones. 



