Jordan and Evermami. — Fishes of North America. 2191 



St. Inner edge of shoulder girdle with 2 or 

 3 conspicuous dermal flaps; pre- 

 orbital region very long; premas- 

 illary and maxillary strong ; inter- 

 orbital groove with a conspicuous 

 median crest; scales rather small 

 (45 to 70.) AWAOUS, 815. 



qq. Dorsal spines 7 or 8 (very rarely 6, especially in 

 Eucyclogohius. ) 

 It. Scales large, ctenoid ; shoulder girdle with- 

 out dermal flaps. 

 V. Sides of head scaled; soft dorsal and 

 anal rather short, of 11 to 14 rays 

 each; deep-water species. 



BOLLMANNIA, 816. 



vv. Sides of head naked ; soft dorsal and 

 anal short, of 10 to 12 rays each ; 

 shore species. Aboma, 817. 



MM. Scales very small, cycloid or nearly so. 



tv. Inner odgo of shoulder girdle without 

 fleshy processes; head naked; 

 body more or less compressed; 

 mouth very oblique ; teeth strong ; 

 interorbital groove with or with- 

 out a median ridge. Vertebra} 

 11 + 15 or 16 ; .soft dorsal and anal 

 long, of 15 to 17 rays each. 

 X. Body chiefly scaly, anteriorly as 

 well as posteriorly. 



MiCEOGOBIUS, 818. 



XX. Body naked anteriorly, scaled 



posteriorly. Zalypnus, 819. 



^vw. Inner edge of shoulder girdle with 



2 or 3 dermal flaps, or processes, 



as in Awaous. 



y. Head naked, the interorbital 



groove with the median 



ridge high, not extending 



forward to orbit; body 



rather robust; soft dorsal 



and anal short ; fresh-water 



species. 



ErCTCLOGOBIUS, 820. 



yy. Head scaled like the body; 

 the interorbital groove 

 with the median ridge 

 little developed ; soft dor- 

 sal and anal long; body 

 elongate; marine species. 

 Lepidogobius, 821. 

 pv. Maxillary much produced backward, extending 

 beyond the gill opening in the adult; skull com- 

 paratively long, gradually (not abruptly) broad- 

 ened behind orbits; median crest of cranium well 

 developed; scales small, cycloid; head naked, 

 occipital region narrowed forward; supraorbital 

 and temporal creata not continuous. 



