170 CYPKIX1DJS. 



to L. hon'e, differing only in the larger scales, of which there are 37 to 40, usually 38 

 or 39, in the lateral line, and \p in a transverse series. L. steindachneri, Pfeff., from 

 the Kingani River, German East Africa, appears to be also closely related to L. horie, 

 but is described as having only 36 scales in the lateral line and a large blackish spot 

 on the caudal peduncle in front of the caudal fin, as in the young of L. coubie. 



In view of the much closer agreement between L. horie and L. senegalensis than 

 between the first and L. niloticus, which species does not occur in the West African 

 rivers, I need hardly say that Giinther's suggestion that L. horie may be a hybrid 

 between L. niloticus and L. coubie is untenable. 



3. LABEO COUBIE. 

 (Plates XXIX., XXX, and XXXI. fig. 2.) 



Labeo coubie, Ruppell, Fortsetz. Beschr. n. Fische Nil, p. 11, pi. iii. fig. 1 (1832) ; Cuvier & 



Valenciennes, Hist. Poiss. xvi. p. 344 (1842). 

 Labeo niloticus, part., Cuvier & Valenciennes, t. c. p. 338. 

 Labeo selti, Cuvier & Valenciennes, t. c. p. 345 ; Steindachner, Sitzb. Ak. Wien, lxi. 1870, p. 562, 



pi. vii. fig. 1. 

 Labeo niloticus, Heckel, Russegger's Reise Egypt, iii. p. 300, pi. xx. fig. 1 (1846) ; Peters, Reise 



Mossamb. iv. p. 46 (1868). 

 Labeo coubie, part., Giinther, Cat. Fish. vii. p. 48 (1868), and Petherick's Trav. ii. p. 260 (1869). 



Body strongly compressed, its greatest depth three to three and two-thirds times in 

 the total length. Head four to four and three-fourths times in the total length in the 

 adult, three to four times in the young, its width three-fifths to three-fourths its 

 length ; snout rounded, often more or less swollen, its length two-fifths to one-half 

 that of the head, at least as long as and often longer than the postocular part of the 

 head ; eye nearly perfectly lateral, although sometimes not at all visible from below, 

 its diameter four and a half to seven times in the length of the head in the adult, three 

 to four times in the young ; interorbital width one-half to three-fifths the length of 

 the head ; mouth strongly arched, its width twice to three times in the length of the 

 head; lips not distinctly fringed on the edge, with small papillae forming transverse 

 plicae on the inner side ; rostral flap large, completely detached at the sides, its edge 

 entire or feebly denticulate ; a minute barbel in the corner of the mouth, usually hidden 

 under the folds of the skin ; tubercles on the snout, or their crater-like scars, much 

 developed in the adult. Dorsal fin composed of III 12-13 (rarely 11 or 14) rays, 

 equally distant from the anterior or the posterior border of the eye and the root of the 

 caudal fin, its upper edge straight or more or less convex in the adult, straight or 

 slightly concave in the young; except in very young specimens, the longest rays more 

 or less exceed the length of the head. Anal fin with III 5 rays, acutely pointed, as long 



