Jordan and Evcnnann. Fishes of North America. 2777 



18(a). GALEICHTHYS XENAUCHEX, Gilbert, new species. 



Head 3^ in length; depth at front of dorsal 5; anal 23. Width of head 

 at opercle 1? in its length; width at front of eyes 2 in head; width of 

 mouth at inner angles 2| in head ; interorbital width 2- 1 - 1 ; eye very small, 

 9 in head, 3 : i in its distance from tip of snout, 4 in postocular part of 

 head, 4 in interorbital width. Teeth all villiforin; inandibiilar bands 

 well separated on middle line, very broad mesially, rapidly tapering to a 

 point laterally, the band produced beyond angle of mouth, its greatest 

 width 2* times in its length; premaxillary baud very convexly curved, 

 following the outline of the snout, its width 5f in its length; vomerine 

 patches roundish, separated by an evident medial groove, marked off 

 from the palatine patches by a narrower groove and a constriction; the 

 palatine patches are equal in width to the vomerine patches, and less 

 than twice as long, of nearly equal width throughout. Maxillary barbels 

 very slender, reaching slightly beyond the base of the pectoral spine; 

 the mental barbels do not reach edge of gill membrane, the outer pair 

 equaling length of snout and | of eye. Nostrils very large, the anterior 

 broadly oval, with widely reflexed rim; the posterior widely elliptical, not 

 concealed by the valve; distance from anterior nostril to tip of snout 

 equaling that from posterior nostril to front of eye. Fontanel wide, with 

 nearly parallel edges on frontal region, abruptly narrowing at front of 

 occiput, where it is continuous with a narrow and shallow groove; the 

 latter fails to reach base of occipital process by a distance equaling ^ 

 diameter of eye. The raised margins of the foutanel continuous 

 with a pair of sharp ridges bounding the groove,, these accompanied 

 by a pair of lower ridges on their outer sides and parallel with them; 

 posteriorly these ridges roughened with granules and^merging into 

 the granulated area on posterior part of occiput; occipital process 

 granulated, the granules arranged in more or less definite lines 

 radiating backward and downward on each side from median point 

 of base; lateral portions of occiput with an area of radiating stria? 

 separated from the central ridges by a smooth groove-like depression; 

 a narrow granulated area extending forward on each side of fontanel to 

 above back of orbits ; occipital process very long and narrow, its width 

 opposite its middle being but 5 of its length, abruptly expanding near 

 base, the basal width being i its length plus that of dorsal plate on 

 median line; opercles and humeral plate weakly striate. Gill membranes 

 with a wide, free fold posteriorly; gill rakers weak and short, 1 + 4 

 movable ones; no evident axial pore. Dorsal spine slender, with a series 

 of sharp granulations on anterior edge, minutely roughened, not serrate, 

 behind, broken in the type, but its length was about | that of head ; pec- 

 toral spines rather slender, rough granular on outer margins, with short, 

 fine seme within, both mutilated in the type, but their length was about 

 equal to that of dorsal spine; pectoral extending nearly f distance to 

 ventrals, the ventrals nearly to origin of anal; distance from anus to base 

 of ventrals | its distance from front of anal ; anal fin very long, its base 

 1 in head, its longest ray ^ head; distance between dorsals 3f in length; 

 adipose fin long, highest about opposite the middle, a short, almost verti- 

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