394 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The general outlines of the body and head agree closely with 

 those of other species. The greatest depth of body is equal to the 

 distance from the tip of the snout to the angle of the preopercle; 

 the greatest width, over the pectoral bases, is contained 2.3 times in 

 the head and about twice in the depth of the body. 



The head is rather firmer and less cavernous than in such species 

 as G. multifilis, G. introniger, and G. longifilis; the greatest width 

 of the head is about equal to the length of the snout plus the eye. 

 The orbit is nearly round; its length is contained 1.15 (to 1.05) x 

 times in length of snout, 4.3 (to 4.2 ) 1 times in length of head. The 

 interorbital is narrow and flat, with -clearly concave sides ; its least 

 width is contained 1.7 (1.5 to 1.8) x times in the greatest orbital 



Pig. 3. — Gadomus denticdlatus. Type. 



length, and is about one-half as great as the length of the snout. 

 The least width of the bony suborbital is about two-thirds that of 

 the interorbital. The two limbs of the opercle do not end in spines ; 

 the lower margin of the interopercle is arched upward a little before 

 its evenly rounded angle. The mouth, as in the other species, is 

 large and moderately oblique; the upper jaw, the length of which 

 is contained 1.85 (1.8 to 1.9) 1 times in the length of the head, ex^ 

 tends but slightly beyond the vertical passing through the posterior 

 margin of the orbit. The teeth are so excessively fine and crowded 

 that they can not be individually distinguished by the unaided eye ; 

 they form an even surface on the two jaws, as also in G. colletti, 

 the Japanese representative of G. denticulatus, and in G. arcuatus, 

 an Atlantic species; the bands of teeth are strongly convex in 

 cross section, the mandibular band being only one-th^d as wide as 



1 These measurements are of the three paratypes more than 100 mm. 

 Measurements of smaller specimens are given in the following table. 



long to anua. 



