18 



U. S. P. R. R. EXPL. AND SURVEYS ZOOLOGY GENERAL REPORT. 



List of specimens. 



6. CALLIURUS MURINUS, Grd. 

 PLATE VII, FIGS. 14. 



SPEC. CHAR. Mouth moderate ; gape oblique upwards. Posterior extremity of maxillary extending to a vertical line 

 drawn inwardly to the anterior rim of the orbit. Eye moderate. Insertion of ventrals situated posteriorly to the base of 

 pectorals and opposite the origin of the dorsal ; their tips reaching the &quot;vent. Scales large. Dark blackish brown. Soft 

 portion of dorsal fin provided with a black patch. 



STN. Cattiurus murinus, GRD. in Proc. Acad. Nat. Sc. Philad. November, 1857. 



This species is closely allied to C. microps, from which it differs chiefly by its larger eye, a 

 more elevated spinous dorsal, the insertion of the ventrals opposite the origin of the dorsal 

 fin, instead of being placed posteriorly to it, the tips of the ventrals reaching the vent, and 

 larger scales also. Besides, the latter are possessed with rather conspicuous pectinations. The 

 edge of the preopercle is finely serrated, and the scales on the cheeks are but a little smaller 

 than those on the opercular apparatus. 



Br. VI : VI; D X, 12; A III, 10; 04, 1, 8, 7, 1, 3; VI, 5; P 14. 



The color is blackish brown above, lighter beneath ; sometimes obsoletely banded transver- 

 sally ; the sides of the head exhibiting sometimes sinuating bluish lines. The fins are of a 

 dark greyish hue, unicolor except the dorsal, which is provided with a black blotch upon the 

 posterior portion of its base. 



References to the figures. Plate VII, fig. 1, represents Cattiurus murinus } size of life. Fg. 2, 

 is a scale from the dorsal region. Fig. 3, a scale from the lateral line. Fig. 4, a scale from 

 the abdominal region. 



List of specimens. 



