2190 Bulletin 47, United States National Museum. 



ii. Preopercle without spine ; caudal witliout many acces- 

 sory rays at base; post-temporal hones short, 

 strongly divergent, the distance between their 

 insertions about equal to the narrow interorbital 

 space, or about I lengtli of head; top of head with 

 a strong median keel, which is highest on the occi- 

 pital region ; no supraoccipital crest; mouth very 

 oblique; the teeth small. Ebotelis, 806. 



ee. Body naked on the anterior part ; head naked ; lower jaw with 4 larger 

 recurved teeth. Gymneleotri8, 807. 



eee. Body entirely naked. Chriolepis, 808. 



aa. Ventral fins united. 



_;. Dorsal fins separate, free from caudal. 



SlCYDIIN^ : 



k. Ventral disk sliort, adnate to belly; body subcylindrical, covered with 

 ctenoid scales ; lips very thick ; upper teeth mostly small and movable, 

 lower fixed ; dorsal spines 6. 



I. Teeth simple; no canines in front of lower jaw. Sicydium, 809. 



II. Teeth trifid (or bifid) ; no canines in front of lower jaw. 



COTYLOPUS, 810. 

 GOBIIN^- : 

 kk. Ventral disk free from the belly. 



7n. Dorsal spines 4 to 8 ; eyes well developed. 



n. Teeth emarginate, uniserial, those of the lower jaw nearly hori- 

 zontal; dorsal spines 6; scales large, ctenoid; gill openings 

 moderate. Evorthodus, 811. 



nn. Teeth simple. 



o. Body scaly, more or le.ss. 



}). Maxillarjt normal, not prolonged behind the rictus; 

 skull of tlie usual gobioid form, comparatively 

 short and aljruptly broadened behind the orbits; 

 occiput depressed; supraoccipital and temporal 

 ridges continuous. 

 q. Dorsal spines 6; scales evidently ctenoid; head 

 naked (the nape scaly as usual.) 

 r. Interorbital area anteriorly elevated, with a 

 large foramen-like depression in front of 

 eye; body short, compressed, formed 

 much as in Dormitator ; nape with a 

 fleshy crest; scales large. Vertebne 

 11-f 15. LOPHOGOBIUS, 812. 



rr. Interorbital area not elevated in front; body 

 more elongate; no fleshy nuchal crest; 

 isthmus broad. 

 s. Inner edge of shoulder girdle without 

 fleshy cirri or papUl.T!; cranium 

 anteriorly short ; interorbital space 

 narrower, grooved, witli a low 

 median ridge or none ; median crest 

 on cranium low. 

 t. Body scaly anteriorly and poste- 

 riorly (sometimes a naked strip 

 on back or belly). Vertebrae 

 12 + 16 to 10 -t- 15. GOBius, 813. 

 it. Body entirely naked anteriorly, 

 the posterior half scaled ; scales 

 moderate or small. 



Garmannia, 814. 



