Jordan and Evcrviann. — Fishes of North America. 2777 



189(a). CALEICHTHYS XENAUCHEN, Gilbert, now species. 



Head 3J in leugtli; deptli at front of dorsal 5^; anal 23. Width of bead 

 at operele Ij in its length; width at front of eyes 2 in head; width of 

 mouth at inner angles 2^ in head; interorbital width 2,\, ; eye veiy small, 

 9 in head, 3!, in its distance from tij) of snont, \% in postocular part of 

 head, 4J in interorbital width. Teeth all villiform; mandibular bands 

 well separated on middle line, very Inroad mesially, rajndly tapering to a 

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

 width 2i times in its length; premaxillary band very convexly curved, 

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

 patches roundish, separated by an evident medial groove, marked oft' 

 from the jialatine 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 b.ase of the pectoral spine; 

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

 equaling length of snout and \ of ej'C. 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 snont 

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

 nearly parallel edges on fronttil region, abruptly narro\ving 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 fontanel continuous 

 with a pair of sharj) 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 jiortions of occijiut with an area of radiating strije 

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

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

 al)ove back of orl)its; occipital process very long and narrow, its width 

 oiiposite its middle being Imt | of its length, abruptly expanding near 

 base, the basal width being \ 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, l + 'i 

 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 serra' within, both mutilated in the type, but their length was about 

 equal to that of dorsal spine; pectoral extending nearly | 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 3* in length; 

 adipose fin long, highest about ox)po8ite the middle, a short, almost verti- 

 3030 97 



