68 PROCEEDINGS OF THE ACADEMY OF [1885. 



dd. Body very slender, elongate, the depth about ^ the 

 length to base of caudal ; post-temporal bones short, 

 strongly divergent, the distance between their inser- 

 tions about equal to the narrow interorbital space, or 

 about ^ length of head ; top of head with a strong 

 median keel, which is highest on the occipital region ; 

 no supraoccipital crest ; preopercle without spine ; 

 mouth very oblique ; the teeth small ; scales very 

 small, cycloid. Erotelis. 5. 



bb. Body naked on the anterior part ; head naked ; lower jaw 

 with four larger recurved teeth. Gymneleotris. 6. 



1. GOBIOMORUS. 



Gobiomorus Lacepede, Hist. Nat. Poiss., ii, 599, 1798 (dormitor, etc.). 

 PMlypnus Cuvier & Valenciennes, Hist. Nat. Poiss., xii, 255, 1837 



(dormitator). 

 Lembus Giinther, Cat. Fish. Brit. Mus., i, 505, 1859 (maculatus). 

 Oobiomorus Jordan & Gilbert, Proc. TJ. S. Nat. Mus , 1882, 571 (restricted 



to dormitator) . 



This genus is well characterized by the presence of vomerine 

 teeth, and b}^ the narrowness of the isthmus. Equally good char- 

 acters may be taken from the cranium, which is provided with 

 elevated, longitudinal and transverse ridges, which are not found 

 in any other of our genera of this t3 r pe. The species reach a 

 larger size than those of our other genera. 



The reasons for preferring the name Gobiomorus to PMlypnus 

 have been given in detail by Jordan and Gilbert (loc. cit.). 



Analysis of Species of Gobiomorus. 



Common Characters. — Body elongate ; the head somewhat 

 depressed ; body compressed behind. Scales ctenoid ; 55 to 66 in 

 a longitudinal series. Dorsal with "7 spines and 9 or 10 rays ; anal 

 rays I, 9 or 10; lower jaw considerably projecting; teeth in jaw 

 rather small, slender, recurved, the outer scarcely enlarged ; teeth 

 on vomer villiform,in a broad crescent-shaped patch ; gill-openings 

 extending forward to below posterior angle of mouth, the isthmus 

 being very narrow. No preopercular spine ; insertion of post- 

 li-mporals almost midway between occipital crest and edge of 

 skull ; parietals with a crest running from insertion of post- 

 temporal forward to just behind eye, where they are connected 



