728 DB. A. GfrNTHBE 017 TisHES [June 6, 



are disposed in three divisions (more or less continuous) on 

 each side; the anterior division is a small rounded patch, the 

 middle a narrow band stretching from vomer to palatine, the 

 posterior on the palatine a rather broad ovate patch. The hand 

 of intermaxillary teeth tapers outvi^ard, and each half is half as 

 long as broad ; the length of the mandihulary band of teeth is contained 

 2| ti7nes in that of the head. The M^idth of the bony interorbital 

 space equals the diameter of the eye, which is contained 1| times 

 in the length of the snout and 4| times in that of the head. 

 Dorsal fin not elevated ; the length of its base is one half of its 

 distance from the adipose fin, the base of which is rather less than 

 that of the dorsal. Dorsal spine shorter than the head without 

 snout, equal in length to the pectoral spine, smooth in front, serrated 

 behind. Anal fin not reaching the caudal, when laid backward, 

 with 12 rays, 8 of which are branched. Caudal fin deeply cleft, 

 with the upper lobe a little longer than the head. Upper and 

 lateral parts blackish-brown. 



Gaboon, collected by R. B. N. "Walker, Esq. One specimen, 

 290 millim. long. 



This species is extremely similar to the type of Ch. furcatus, 

 with which it agrees singularly well in regard to the disposition of 

 the teeth on the palate, and the form and formation of the snout 

 and mouth ; but its body is considerably stouter and shorter, the 

 dorsal fin is less elevated, the adipose longer. The differences may 

 be epitomized thus : 



Oh. furcatus. Ch. persimilis. 



Height of body one sixth ; one fifth. 



Length of the head about one fourth ; about one third. 

 Base of dorsal fin = two fifths of 



distance between dorsal fins ; one half. 



Dorsal spine less than length of 



head without snout ; equal to that length. 



Base of adipose fin much shorter 



than that of dorsal ; rather shorter, 



Interm axillary band of teeth rounded 



at each end ; tapering. 



Chetsichthts eingsley^, sp. n. (Plate XLV. fig. A.) 



The height of the body is two ninths of the total length (with- 

 out caudal), the length of the head a little less than one third. 

 The depth of the caudal peduncle is contained 1§ times in its 

 length. Head a little broader than high, its greatest depth being 

 contained If times in its length ; its upper parts are covered with 

 skin ; occipital process rather longer than the basal bone of the 

 dorsal spine. Snout rather long, somewhat contracted in front, 

 with the upper profile descending in a gentle curve : its length is 

 contained 2|- times in that of the head. Mouth rather wide, not 

 extending to the middle of the distance between eye and nostril, 

 wider than the distance between the eyes. Nasal barbels small 



