G30 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



inhabit fresh waters, and others live indiscriminately in either fresh or 

 salt water. Genera GO-TO; species nearly 400. 



(Gobiid : part ; groups Gobiimt, Amblyopiiia, and Trypauchenina Giiuther, iii, 1-13??.) 



Vent nils separate; body scaly. 

 a. Vomerine teeth present; isthmus narrow, the gill-openings continued forward 



below ..................................... PHILYFNUS, 339. 



an. Vomerine teeth wanting; isthmus broad. 



b. Scales small (00-100 in a lengthwise series); teeth fixed ....... ELKOTRIS, 340. 



bb. Scales large (30-35 in a lengthwise series); outer teeth movable. 



HORMITATOR, 341. 

 ' Ventral iins united. 



c. Dorsal Iins separate. (Gobiiiuv.} 

 d. Dorsal spines several. 

 c. Body scaly. 

 /. Scales ctenoid; dorsal spines G; maxillary moderately developed, end- 



ing below the eye. 



/i. Teeth in the upper jaw emarginate, in one series; teeth of lower jaw 

 horizontal .............................. EVORTHODUS, 34v>. 



hit. Teeth all simple. 



i. Teeth in the npper jaw in one series; those below in a very narrow 

 band ................................ EUCTENOGOUICS, 34:!. 



ii. Teeth in several series in each jaw. 



j. Teeth of the outer scries fixed, somewhat enlarged; body not 

 greatly elongate .............................. GOBIUS, 344. 



jj. Teeth of the outer series setaceous, movable; body extreme! \ 

 long and slender ...... .................. GoiiioxKi.r.rs, 34f>. 



ff. Scales very small, cycloid. 



k. Maxillary inordinately developed, in the adult, reaching the 

 gill-opening; dorsal spines!) ............ GILLICIITHYS, :;4(i. 



kk. Maxillary moderately developed; dorsal spines 7 or 8. 



LEPiDOGOiurs, 347. 

 i-c. Hiidy naked : teeth in bands: no canines ............. GOBIOSOMA, 34^. 



(ill. Dorsal spines 2; body naked; eyes obsolete ....... ..TVPHLOGOBIUS, 319. 



CC. Dorsal fin continuous; scales minute or wanting. (AmblyopinCB.) 



1. Teeth in a single series ................... TYNTLASTKS, 350. 



339. PHIL-YPNUS Cnvier & Valenciennes. 



n (iiinther.) 



(Guv. A.- \:\\. Hist. Nat. 1'oiss. xi, '.">.">, 1837: type Pldti/cijiJinlun tlormitator Bloch & 

 Schn.) 



r.udy elongate, Ici'ctc anteriorly, compressed behind. ITead elongate, 

 depressed ;ilo\ e. Month l;:r.^e; lower ja\v longest. Teeth cardifomi, ou 

 jaws and voiner; no teeth <m palatines and tongue. Gill-openings con- 

 tinued forward below, so that the isthmus is very narrow. Scales mod 

 rate, ctenoid, eovering most of the head. Dorsal Iins well separated, 

 the first of 7 spines; ventrals separate. Largest of the doliics, some of 

 the species reaching a length of nearly - led Tropical rivers and 

 bays. (i.":7y;r!/</?, slumber-loving.) 



