514 REVIEW OF NORTH AMERICAN GOBIID^. 



Gobius oceanicus. 



Skull behind eye broad and short, its length 1^ in width, no decided 

 ridges nor crests ; lateral crests large and stout behind, minute forward. 

 Interorbital area narrow, deeply grooved, with a median ridge. 



Vertebrae, 11 + 15. 



Chouophorus taiasica. 



Skull rounded behind, with a very short crest in its middle ; lateral 

 crests high aud thin, converging into one opposite the insertion of the 

 suprascapula. The inner crests do not meet behind the eye ; the outer 

 ones extend around the orbit. A low, blunt ridge between the posterior 

 corners of the orbit, becoming much higher forward, continued as the 

 ethmoid and ending abruptly some distance in advance of the orbit. 



Teeth in the upper jaw in a few series, those of the outer series many 

 times larger than the others, which are minute ; those of the lower jaw 

 all alike small, in a band. 



Microgobius gulosus. 



Skull flattened behind, with a median ridge extending from the eyes 

 back to end of skull. Double crests border the skull in front and on 

 sides. The inner ones meet in front of median crest. Interorbital very 

 narrow and deeply grooved, with a median ridge. Frontal bones very 

 thin and fragile. 



Vertebrai, 11 + 15. 



Teeth on both jaws in narrow bands, all alike. 



Microgobius signatas. 



Skull rounded, very fragile. A median crest which is highest between 

 the eyes. Lateral crests developed ; the inner ones meeting above the 

 posterior part of the eye. Interorbital comparatively broad, the median 

 crest ending above the anterior part of the orbit. 



Vertebrae, 14 + 15. 



Teeth in both jaws, in two or three series, the outer series of the 

 upper jaw enlarged and recurved, the inner ones minute. The outer 

 series of the lower jaw smaller than those of the upper jaw, the one 

 nearest angle of mouth an enlarged canine. 



Gobiosoma molestum. 



Skull flattish, with a slight median keel. Lateral crests developed, 

 lower and stronger than in Gobius. Interorbital very narrow, bounded 

 bj" two minute crests. Bones of the skull very weak and fragile. 



Vertebrae, 12 + 15. 



Teeth in both jaws recurved, in two or three series. 



Gillichthys mirabilis. 



Skull not abruptly widened behind eye, as in Gobius, being triangular 

 posteriorly. No lateral ridges; a strong median keel; a short trans- 



