G.30 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



iuliabit fresh waters, and others live iudiscriiuiuately in cither fresh or 

 salt water. Genera 60-70; species nearly 400. 

 (GobUdcj part; groups Gobiina, AnMijopina, and Tri/jMuvlienina Giiutlior, iii, 1-138.) 



* \'eut.r;ils separate ; body scaly. {Elcotridbuv.) 

 a. Vomeriue teeth present; isthmus narrow, the gill-opeuiugs continued forward 



below .-..Philypnus, 339. 



aa. Vomerine teeth wanting; istlimus broad. 



h. Scales small (60-100 in a lengthwise series) ; teeth iixed Eleotris, 340. 



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



DOUMITATOR, 341. 



*" Ventral fins united. 



c. Dorsal fins separate. ( Gohiince.) ' 

 d. Dorsal spines several. 

 e. Body scaly. 

 /. Scales ctenoid; dorsal spines 6; maxillary moderately developed, end- 

 ing below the eye. 

 /(. Teeth in the n^jper jaw emarginate, in one series; teeth of lower jaw 



horizontal Evorthodus, 34'i. 



hh. Teeth all simple. 

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



baud EUCTENOGOBIUS, 343. 



ii. Teeth in several series in each jaw. 

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



greatly elongate Gobius, 344. 



jj. Teeth of the outer series setae-eons, movable; bodj^ extremely 



long and slender Gobioxellus, 345. 



ff. Scales very small, cycloid. 



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



gill-opeuing; dorsal spines 6 Gillichthys, 346. 



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



Lepidogobius, 347. 



ee. Body naked; teeth in bands; no canines GoBiosOMA, 348. 



dd. Dorsal spiues 2; body naked; eyes obsolete ...Typhlogobit's, 3l9. 



cc. Dorsal fin continuous ; scales minute or wanting. (Amblyopina'.) 



I. Teeth in a siucrle series Tyxtlastes, 350. 



339.— PMai.YP]^ir§ Cuvier & Valenciennes. 

 {Lemhus Giinther.) 



(Cuv. & Val. Hist. Nat. Poiss. xi, 255, 1837: type Plufycephalus dormitator Bloch & 

 Schn.) 



Body elongate, terete anteriorly, compressed behind. Head elongate, 

 depressed above. Mouth large; lower jaw longest. Teeth cardiform, on 

 jaws and vomer; no teeth on i)alatines and tongue. Gill-openings con- 

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

 erate, ctenoid, covering most of the head. Dorsal fins well separated, 

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

 the sj)ecies reaching a length of nearly 2 feet Tropical rivers and 

 bays. (i/'jV.u-v«?, slumber-loving.) 



