1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 153 



Measurements. 



Length of body to base of caudal ... 



Depth of body 



Length of head 



Depth of head 



Width f head 



Width of body at front part of dorsal 



Eye 



Intei orbital space 



Snout 



Maxillary beyond the eye 



Pectoral fin 



Ventral fin 



15. Opisthognathus ommata, sp. now (Type, No. 39640, II. S. N. M.) 



Head 3 in the leugth of body to the base of the caudal; in total 

 length 3.75. The width of head, 5. The depth 5 in body to base of 

 caudal ; depth of body, 4.15 ; width, 8.3 iu length of body ; dorsal spines 

 and rays, 28; anal spines and rays, 18; scales in longitudinal series, 

 about 140; branchiostegals, 0. 



Body moderate, compressed, depth 4.15, width behind the head 8.3 in 

 the length of the body. Head large, its breadth equaling its depth, be- 

 ing 5 in the length of the body. 



Scales small, embedded, head naked, lateral line extending past the 

 middle of the dorsal tin. Mouth large. 



Mavillary long, 1.5 in head; postorbital portion 2.3 iu head, not ex- 

 tending beyond the head. The suout short, its length less tha i half the 

 diameter of the eye; the distance from tip of suout to the end of maxil- 

 lary is contained 3.3 in the length of the body and 1.2 iu the head. 



Teeth in front part of each jaw in several series ; ou sides of jaws re- 

 duced to a single series; the outer series strong. A to th on the 

 vomer. 



The gill membra: es are connected. 



Eye 3 iu head, the iuterorbital space very narrow, 11.6 in head. 



Distance from suout to origin of dorsal but little greater than leugth 

 of head; space between dorsal and caudal fins one-half greater than the 

 length of snout. There is no depression between the spinous and soft 

 rays of the dorsal fin, the dorsal equaling the anal in height; its longest 

 ray is 1.66 times the eye. 



The pec orals are slightly longer than the ventrals, being 2 in head; 

 the breadth of the pectorals is 3 in the head. 



The ventrals are inserted slightly in front of the pectorals. 



The caudal is rounded and narrow. 



Coloration: The body is irregularly mottled with dark, head evenly 

 blackish. The dorsal fin is blackish on the posterior portion, with two 

 rows of four or five pale spots well separated. There is a large ocellated 

 spot from the third to the sixth spines, including them, greater than the 

 diameter of the eye. Anal tin black, with a series of pale spots on the 



