2780 Bulletin ^7, United States National Museum. 



obtuse bL'himl. Foutauel narrow and short, endiug far in front of 

 occipital process, not extending backward as a groove behind the smooth 

 area of the top of the head; posterior end of fontanel midway between 

 tip of snout and middle of dorsal shield. Occipital process broad, its 

 edges not straight. Band of palatine teeth large, but not produced l)ack- 

 ward on the inner margin. * * * There is no evidence of the occur- 

 rence of the true A, assiiiiilis in Pacitic waters." 



19:.'. (;ALEI0HTHYS SUUINAMENSIS (Bleeker), text, p. 129. 



193. «ALEI(;HTHYS DASYCEPHALU.S (Giiutbti). 



Head 41 (SH" total); depth 6 (7i in total); width of head 5^. D. I, 

 7; A. IV, 17. Length (2!»400) 11 inches. Body elongate, compressed 

 behind, the head small, narrow, and moderately depressed anteriorly, the 

 snout not very blunt. Eye rather large, placed somewhat above level of 

 angle of mouth, its length 5 in head; width of iuterorbital space 2,1; in 

 head; breadth of mouth 2^; length of snout 3^. Teeth villiform, those 

 of vomer and palatines rather coarse, bluntly conic; bands of vomerine 

 teeth separated by a rather broad area, each continent with the neighbor- 

 ing palatine band, the two forming a small oblong patch much smaller 

 than the eye, the division between the palatine and vomer scarcely 

 appreciable. Palatine bands without backward prolongation. Bands of 

 teeth in jaws short and broad. Maxillary barbel reaching about to 

 middle of pectoral spine; outer mental barbel to base of pectoral ; inner 

 slightly more than ^ head. Dorsal shield short, crescent-shaped, a 

 little more than .S times as broad as long on the median line. Occipital 

 process subtriangular, its sides straight, slightly longer than broad, its 

 median line rather sharply keeled. Close in front of its base begins the 

 deep fontanel, which is narrow and groove-like jiosteriorly, becoming 

 rather abiuptly broader above the opercle, then gradually narrowed 

 anteriorly. Ridges bounding fontanel prominent anteriorly to a point 

 Just behind vertical from nostrils, coarsely granular for their whole 

 length, the granules mostly arranged in 1 series. Between these ridges 

 and the eye on each side is another ridge extending obliquely backward 

 and inward irom aljove front of eye, likewise very coarsely granular, the 

 granules mostly in 2 series. Hhields of head all rough granular, the 

 granules forming irregular lines. Gill membranes forming a narrow fold 

 across isthmus. Dorsal spine moderate, about ecifual to pectoral spine, IJ^ 

 in head; axillary pore present, small; humeral process broad, scarcely 

 granular, about 'i pectoral spine; adipose fin rather long and low; caudal 

 long, the upper lobe the longer, somewhat longer than he.ad ; anal long and 

 high, its outline emarginate, its longest rays a little more than i head; 

 ventrals long, the vent nearer their base than that of anal. Color dusky, 

 the entire ventral surface soiled with dark points ; tins all largely black- 

 ish; barbels black. Two specimens were obtained at Panama by Dr. 

 Gilbert. This species may be known at once by the 4 granulated ridges, 

 which extend the length of the iuterorbital space. In the female, later 

 taken, the granulations on the head are largely covered by soft skin. 



