480 REVIEW OF NORTH AMERICAN GOBIID^. 



0. Body scaly, more or less. 

 p. Dorsal spines 6; scales evidently ctenoid. 



q. luterorbital area anteriorly elevated, with a large 

 foramen-like depression in front of 

 eye ; body short, compressed, formed 

 much as in Dormitator ; nape with a 

 lleshy crest ; scales large. Vertebrae 



11 + 15 LOPHOGOBIUS, 11. 



qq. Interorbital area not elevated in front, higher 

 than the occipital region ; body more 

 elongate; no fleshy nuchal crest; isth- 

 mus broad, 

 r. Inner edge of shoulder-girdle without fleshy 

 cirri or papillai ; cranium anteriorly 

 short ; interorbital space narrower, 

 grooved, with a low median ridge or 

 none ; median crest on cranium low. 

 Vertebrte 12+16 (ni^fer); 10+15 (oceaw- 



icus) OJOBIUS, 12. 



)T. Inner edge of shoulder-girdle with two or three 

 conspicuous dermal flaps; preorbital 

 region very long ; premaxillary and 

 maxillary strong ; interorbital groove 

 with a conspicuous median crest. 

 Choxophorus, 13. 

 pp. Dorsal spines 7 or 8 ; scales very small, cycloid or 

 weakly ctenoid. 

 s. Inner edge of shoulder-girdle with two or 

 three dermal flaps or processes ; inter- 

 orbital groove with the median ridge 

 little developed (7e^iriMs). Body little 



compressed LepidoGobius, 14. 



8S. Inner edge of shoulder-girdle without fleshy 

 processes ; body more or less com- 

 pressed ; mouth very oblique ; teeth 

 strong ; interorbital groove with or 

 without a median ridge. Vertebrae 



11+15 or 16 MiCROGOBius, 15. 



00. Body entirely naked ; body not strongly compressed. 



GOBIOSOMA, 16. 

 nn. Maxillary much produced backward, extending beyond 

 the gill-opening in the adult; skull 

 comparatively long, gradually (not 

 abruptly) broadened behind orbits; 

 median crest of cranium well- devel- 

 oped ; a cross-ridge across posterior 

 partof interorbital space; scalessmaM, 

 cycloid ; dorsal spines 6 ; no fleshy 

 processes on shoulder-girdle ; isthmus 

 broad. Vertebrae 14+16 {mirahilis). 



GiLLICHTHYS, 17. 



II. Dorsal spines two (or one) ; body wholly naked ; eyes re- 

 duced to small rudiments ; interorbital 

 area forming a sharp median ridge ; 

 skull rather abruptly widened behind 



