COPE ON ICHTHYIC FAUNA OF THE GEEEN EIVER SHALES. 815 



The length of tbe head enters the total four times, and that of the orbit 

 enters the head 4.00 times, and into the length of the mnzzle one and 

 one-third times. The profile of the top of the head is slightly convex, 

 and the dorsal line is also slightly convex. The mouth opens somewhat 

 obliquely upward. The end of the maxillarj^ bone reaches a point below 

 the middle of the orbit. The teeth of the inferior border of the pre- 

 operculum are strong, and are directed forward; they number five. The 

 angle of the 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 maxillary 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 gen- 

 era. 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. 



it. 



Total length 0.280 



Axial length of head O.OTO 



Axial length to line of first dorsal spine 0.085 



Axial length to line of first ray of second dorsal 0. 143 



Axial length to line of first anal spine 0.152 



Axial length to base of caudal 9.232 



Depth at orbit 0.051 



Depth at first anal ray 0.055 



Depth of caudal peduncle 0.030 



Length of third dorsal spine 0.0.30 



Length of second anal siiine 0.016 



MiOPLOSUS LONGUS, S}). UOV. 



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

 given to be maintained as a species distinct from the Hi. Jabracoides. It 

 is represented by two individuals of much smaller size than those of the 

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

 radii fewer. 



The formuhe are:— D. IX— 12; A. II. 12. Yertebrte: 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 preoperculum are strong and acute ; there are three large and two 

 small ones. 



' ' Measurements. 



Total length 0.175 



Length of head 042 



Length to line of first dorsal 0.054 



Length to line of second dorsal 0.OS5 



Length to line of anal 0.091 



