942 CONTRIBUTIONS TO NORTH AMKKK'AN ICHTHYOLOGY IV. 



Jlian long; the bon\ bridge across the occiput but little shorter than tin- 

 part of the head which precedes it. In A. y-(jy(rctim the naked area is 

 trapezoidal, longer than broad, and a 1 tout 4 times the length of the snout : 

 the Y is forked for more than half its length, its undivided part more 

 than twice as long as broad, and not concave; the occipital plate is not 

 half as long as the part of the head which precedes it. 



I 'a. ire 020. After Axfnwujms anoplux add: 



FAMILY GUI (//) OPISTHOGNATIIID^E. 



Hody oblong or elongate, low, moderately compressed, covered with 

 small, cycloid scales. Lateral line present, usually incomplete, straight, 

 runuin.tr close to the dorsal fin. Head large, naked, the anterior profile 

 deciirved. Mouth terminal, horizontal, its cleft usually very wide, the 

 maxillary extending past the eye, and sometimes considerably beyond 

 the head; supplemental maxillary present; premaxillaries protractile: 

 jaws siibequal, with conical or cardiform teeth; vomer usually with a 

 few teeth; palatines toothless; operdes unarmed: no suborbit-al stay. 

 I'seudobrauchia- present. Gill-rakers rather long; gills I, a slit behind 

 the fourth; gill-membranes united, free from the isthmus. Hranchio-.. 

 legals (5. Air-bladder present. No pyloric cceca. Dorsal. fin long, con 

 tiuuous, its anterior half composed of slender, llexible spines; caudal 

 distinct, rounded or lanceolate; tail diphycercal; anal long, without 

 distinct spines; ventrals separate, jugular, I, 5, the middle rays long 

 est; pectorals fan-shaped. Two genera, of about 12 species, inhab- 

 iting rocky bottoms in tropical seas. Their relationships are apparently 

 with Trachinoid forms, but they bear considerable resemblance to the 

 ('linoid niennies. (TnicliinidcCj genus Opixthognathux Cliinther, ii, 254- 

 266.) 



n. M:i\ill:M-y n!' ni(nl-r:itr li-n^Mi. tninratr behind ............. ONATIII r< '!-. :':>(&). 



<HI M.ixill:iry of <jrr.-it length, prolonged in a Ilcxilih- l:iniin:i lidiind. 



< U'lSTIKn.NA 1 III >. 



(fc)- GKATIIYPOPS (Jill. 

 till, I'M". \< . N.M. Si-i. I'liilii. l-r>-,>, ','11: I\|>r OpisthOfflMthlU maxitt08U6 I'IH-V. ) 



This genus includes those O/>ixtlt<>(/ii<iflii<l' in which the maxillary is 

 of medium length and truncate behind. ()-"> "-:, j a \\ : -'', IM-IOW; w<f, 



eye, 



077 (6). . maxillosiis , .!'...>) Gill. 



Color gi-.yish olive, with 7 irregular X- s l |:l l )( ' ( l bars of darker, every 

 where much marbled and variegated: fins all similarly marked, the 



