PROCEEDINGS OF UNITED 8TATK.S NATIONAL MUSEUM. 361 



length of head; veutral disk as long- as head; distance from base of 

 caudal to front of dorsal equaling three-tenths of the length; caudal 

 rounded behind. 



Head 3 in length ; depth oh. D. ; A. 7. 



Brown, banded with blackish on body, the head marbled with darker 

 brown ; front of dorsal black, the fins dusky with dark points. 



Three specimens, the largest about 2 inches long, were obtained in a 

 tide-pool at Mazatlau. The species is evidently not common. 



27. Gobiosoma zosterurum, sp. nov. (29245.) 



Body long, slender, its greatest depth less than greatest depth of 

 head. Head long, slender; mouth large, the lower jaw projecting; 

 maxillary extending slightly beyond posterior edge of orbit. Eye 

 rather large, longer than snout, 3| in head ; the interorbital space nar- 

 rower than the pupil. Teeth small, in villiform bands, the outer in the 

 upper jaw slightly enlarged. Snout rather pointed, subconical, the 

 profile not very gibbous. Spinons dorsal high, the spines slender, the 

 anterior filamentous, its height considerably more than greatest depth 

 of body. Yentrals If in length of head ; pectorals short, half length 

 of head. Caudal f length of head, skin wholly naked. 



Head 3^ in length ; depth G§ ; D. IV-10 ; A. 12. Olivaceous, vaguely 

 barred, everywhere closely punctate with darker, even the belly not 

 l)ale; lower parts of head thickly punctate with dark dots like th& 

 sides ; sides of body and head with some faint pale spots ; caudal with 

 two distinct black lengthwise bands, its upper and lower edges white^ 

 the middle part colored like the body ; dorsal and anal largely black, 

 with pale edgings; pectorals and ventrals dusky. 



A single specimen about 1^ inches long was taken with a seine in the- 

 Astillero at Mazatlan. 



28. CHnus zonifer, 8]i. uov. (28122.) 



Subgenus Lahrosomus Swainson; allied to CUnus delalaiidi C. & V. 



Form rather stout, compressed ; snout not very short, rather pointed, 

 the profile gibbous above the eyes, thence declining straight to the tip- 

 of the snout ; mouth rather small, the maxillary reaching front of eye ; 

 eye large, 3J in head, as long as snout ; small slender cirri above the 

 eyes, and a fringe of rather long filaments at the nape rather longer 

 than the orbital cirri. Outline of spinous dorsal emarginate ; first spine 

 a little longer than eye, the second, third, and fourth progressively 

 shortened, the fifth again longer ; the eighth to eleventh spines are the 

 longest, thence gradually decreasing to the next to the last, which is 

 much shorter than the last; soft dorsal rays considerably* higher than 

 the spines, the longest about one-half length of head. Anal long, not 

 very high, the membrane deeply notched between all but the last six 

 rays, which are the highest. Pectorals five-sixths length of head; 



