of the Island of Trinidad, W. I. 17 



sienna-yellow, with irregular black spots and dots near the 

 mouth and between the eyes, and with scattered dots on the 

 cheeks and opercular bones. A dark spot forming a triangle 

 covers the operculum. 



Order. 

 PHAKYITGOGNATHI, Mull. 



Sub- Order. 

 ACANTHOPTERYGn, Mull. 



Family. 

 Chkomtdid^, Bonaparte. 



Genus. 

 Cychlasoma, Swainson, (emend.) 



Body oval, compressed, covered by large scales. 



Head obese, with the profile triangular. 



Mouth moderate, with the gape vertically elliptical ; lower 

 jaw shorter than the upper. The intermaxillaries, which alone 

 form the arch of the upper jaw, are very protractile, and the 

 ascending branches are as long or longer than the horizontal; 

 when retracted their extremities reach to a point in the fore- 

 head beyond the anterior borders of the orbits. 



Teeth on the intermaxillaries of the anterior row moderate, 

 sub-cylindrical, approximated, recurved at the apices ; behind 

 these are many irregular, smaller teeth, which increase in num- 

 ber and size towards the symphisis of the intermaxillaries. The 

 dentaries are provided with similar teeth, but the hinder ones 

 near the symphisis are a little smaller than those of the outer 

 row. Palatines, vomer, and tongue edentate. 



Li{ps thick. 



Tongue thick and rounded in front. 



Lower ^pharyngeals united into a single equilateral, triangular 



