444 Zoological Society : — 



band, those of the outer series larger, somewhat compressed, brown 

 at the tip ; palate smooth. Opercles scaly ; prseopercular margin 

 entire. Nostril simple. 



The height of the body is contained three times and one-half in 

 the total length, the length of the head four times and two-thirds. 

 The interorbital space is convex, and its width rather more than the 

 diameter of the eye, which is one-half the length of the snout. There 

 are six series of small scales between the prseorbital and the angle of 

 the prseoperculum. The dorsal fin and the lateral line commence on 

 the same vertical ; caudal truncated ; the commencement of the anal 

 falls vertically below the sixteenth dorsal spine ; the ventral is inserted 

 behind the pectoral, and extends on to the vent. Greenish, the 

 middle of the body clouded with blackish, in form of indistinct ver- 

 tical bands ; a round black spot at the root of the caudal ; the outer 

 parts of the fins blackish. 



This species would be placed in the genus Heros of Heckel. 

 Hah. Fresh waters of Mexico. 



in. lin. 



Total length 7 



Height of the body 2 



Length of the head 1 6 



Diameter of the eye 2>\ 



Chromis fenestrata, n. sp. 



D. g. A. \. V. 1/5. L. lat. 33. L. transv. 6/13. 



Mouth narrow, protractile ; teeth of the jaws cardiform, in a short 

 band ; those of the outer series larger, somewhat compressed, brown 

 at the tip ; palate smooth. Opercles scaly ; prseopercular margin 

 entire. Nostril simple. 



The height of the body is contained two and three-fifth times in 

 the total length ; the length of the head four times. The interorbital 

 space is convex, and its width more than the diameter of the eye, 

 which is one-half the length of the snout. There are five series of 

 scales between the prseorbital and the angle of the praeoperculum. 

 The dorsal fin and the lateral line commence on the same vertical ; 

 caudal truncated; the commencement of the anal falls vertically 

 below the fifteenth dorsal spine ; the ventral is inserted behind the 

 pectoral and extends on to the anal. Blackish-green, with six black 

 vertical bands, crossing a deep black longitudinal band, which runs 

 from above the pectoral to the root of the caudal. Vertical and ven- 

 tral fins blackish, darkest at the base and margins. 



This species would be placed in the genus Heros of Heckel. 

 Hab. Rio de la Lana (Mexico). 



in. lin. 



Total length 3 8 



Length of the head 11 



Height of the body 1 5 



Diameter of the eye 2J 



