of the Island of Trinidad, W. I. 15 



towards the angles ; from the angles, the radiated striae on the 

 posterior fields of the scales originate. 



Head, when not inflated, long, laterally compressed, above 

 broad and rather flat behind the eyes ; the latter are horizontal, 

 and closely approximated. 



Mouth terminal, moderate, with the gape elliptical, jaws sub- 

 equal. The intermaxillaries which alone form the arch of the 

 upper jaw are moderately protractile, the ascending branch 

 being more than half the length of the horizontal one, and re- 

 tractile to about the anterior borders of the orbits. 



Teeth on both the intermaxillaries and dentaries in an ante- 

 rior row, slender, subcylindrical, recurved, behind which are 

 many similar, but smaller ones. The remaining bones of the 

 mouth and the tongue are without teeth. 



Tongue oblong, with the angles blunt, and with the front 

 emarginate, attached to within a short distance of the margin 

 to the floor of the mouth by the skin. 



Lower ^pharyngeals together forming an. elongated triangle, 

 with the sides and posterior broadly emarginate and with a 

 shallow furrow running through the middle : teeth not numerous, 

 long and slender. 



JBranchiostegal membrane attached to anterior pai't of the 

 thorax, and containing five rays. 



Lateral line obsolete. 



Dorsal double ; the anterior one rises above or slightly be- 

 hind the base of the pectorals, and is of a subtriangular form, 

 supported by slender spines ; the posterior one is long, mode- 

 rately high and subequal. 



Anal smaller than second dorsal, terminating at the same 

 distance from the head. 



Caudal with the margin rounded. 



Ventrals funnel-shaped, united anteriorly by a rather low 

 traverse. 



This is one of the many heterogeneous types that have been 



