434 Memoir Sears Foundation for Marine Research 



3.8. I NTERORBiTAL very narrow, 7.0—10 in head. Cheek fully as long as deep. Mouth 

 nearly vertical. Maxillary broad, rounded in young, with an oblique margin in some- 

 what larger ones, ending under anterior half of eye, becoming produced into a narrow 

 process in examples (>c^ mm SL and upward, extending to or beyond margin of opercle 

 in large individuals, about 2.2 in head in small examples to i.i in large specimens. 



■wmiii»j;iii.ii,iii"|iwimJMJ.'ii.lWH'iJ|i.<ii 



Figure iio. Odontognathus compressus, about 105 mm TL (caudal 

 type, USNM 79533. Drawn by Ann S. Green. 



damaged), 88 mm SL, Col6n, Panama, 



Mandible projecting strongly, its tip a little below dorsal outline of head, its margin 

 within mouth rising abruptly, forming an obtusely rounded angle, 1.75—2.0 in head. 

 Gill rakers rather slender, about half as long as eye, with rather well-developed serrae 

 along inner edge, 19-23 on the lower limb. Teeth small to minute; apparently in a 

 single series on mandible and on margin of premaxillary and maxillary but absent on 

 membranous section between the last mentioned elements; minute teeth present on 

 palatines, pterygoids, and on median section of tongue. 



Dorsal fin small, rather feebly developed, more or less damaged in all specimens 

 at hand, ending over middle of anal fin. Its origin more 

 than a head-length behind origin of anal, not quite 

 twice as far from margin of snout as from base of cau- 

 dal, its distance from margin of snout 1.5— 1.55 in SL. 

 Caudal fin rather broadly forked, the lower lobe the 

 longer, about as long as head. Anal fin long, its origin 

 about an eye's diameter nearer to tip of mandible than 

 to base of caudal, its base 1.8— 2.1 in SL. Pectoral 

 fin a little longer than head, often reaching opposite to 

 last ventral scute, sometimes failing to reach this point, 

 4.0-4.75 in SL; free axillary process about half as 

 long as fin. 



Figure III. Odontognathus compres- ^^;^^_ p^j^ ;^ alcohol. Sides of head silvery. Body 



sus head showing produced maxillary . ., , 1111 11 -i 



bone; same specimen as shown in Fig. With a Silvery lateral band, about as broad as pupil. 

 IIO. Drawn by Ann S. Green. Back with dusky points and a median pale line in ad- 



