CHROMIS BUTTIKOFERI. 67 



two fifths iü the total length (without caudal) , the height 

 of the body twice and one fourth. The teeth are more 

 considerable in size and smaller in number than in either 

 of the two species above mentioned , there being only ten 

 teeth on each side in the upper and five in the lower jaw. 

 From five to six series of scales on the cheek below the 

 eye ; thirty scales in a straight line from the opercle to 

 the caudal ; four longitudinal rows of scales above and ten 

 below the lateral line. The fin-formula is D. '^/is*, A. 

 ^/lo-u ; the pectoral fin does not extend to the anal. 



There are eight black transverse bands : the first across 

 the eyes , fainter than the succeeding ones ; the second 

 across the nape and opercle, being continued on the belly 

 before the pectorals; the third commences at the begin- 

 ning of the spinous dorsal , runs behind the pectoral to 

 the root of the ventral ; the fourth , fifth and sixth from 

 the dorsal fin to the belly , the fifth attaining the vent 

 and the beginning of the anal , the sixth descending to 

 the posterior half of the anal. Each of the four last-named 

 bands lias a width of from three to four scales, the light 

 space between them is only one or two scales wide. The 

 seventh and eighth transverse band occupy the free por- 

 tion of the tail; the space between them is even smaller 

 and sometimes they appear to coalesce. The root of the 

 caudal fin and a transverse band across its extremity 

 are light-coloured; the intervening surface is blackish. 

 Bands four , five , six and seven are continued on the ver- 

 tical fins : this is more conspicuous in young than in older 

 individuals where the dark colour spreads over the whole 

 of the fins. The pectorals are dark-coloured , the ventrals 

 black with the outer elongated ray white. 



The above description will suffice to show that the spe- 

 cimens in question are indeed specifically different both 

 from C. niloticus and C. mossamhicus , the two species to 

 which Steindachner has reduced all those that were hitherto 

 described from Africa. The pectoral fin never attains to 

 the length which characterizes that of C. niloticus ; the teeth 



Notes from thie Leyden IMuseum, "Vol. lUL. 



