434 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



Head small, depressed above, constricted sides approximated below, 

 and lower profile little more inclined. Snout wide, depressed, length 

 about f its width. Eye large, high, about midway in head length. 

 Mouth broad, commissure about half way to eye, slightly inclined. 

 Jaws produced, upper protractile nearly equal to snout length. 

 Lower jaw with rami firm at symphysis. Teeth in bands of mod- 

 erate width in jaws, all simple, conic and outer row slightly enlarged 

 and curved. Maxillary greatly inclined, largely slips below front 

 edge of preorbital. Tongue small, depressed, rather narrow, free 

 in front. No teeth on roof of mouth. Lips rather thin. Nostrils 

 close to upper front eye edge. Interorbital broad, flattened. Pre- 

 orbital large, deeper than long and its length about f of eye. Pre- 

 opercle ridge vertical. 



Fig. 5. — Gambusia mcnieli Fowler. 



Gill-opening forward nearly opposite front rim of pupil. Rakers 

 about 14, very slender, their length about | of filaments and latter 

 about f of eye. Isthmus narrow and trenchant. 



Scales large, narrowly imbricated, smaller on caudal base. Scales 

 large on prepectoral region and a single row on cheek. Opercles 

 and top of head with rather large scales. Obscure lateral line, 

 imperfect, and as simple pore in middle of exposure of scale, course 

 median along side, at least posteriorly (squamation largely damaged 

 anteriorly) . 



Dorsal origin just behind anal base, or about last third between 

 front edge of eye and caudal base, and depressed fin extending about 

 | to caudal base. Anal inserted about midway between middle of 

 eye and caudal base, first branched ray longest and others regularly 



