242 Mr. J. Y. Johnson on rare and little-known 



rial disk of 16 pairs of lamina?. The length of this disk, com- 

 pared with the total length, was as 1 to 3§ ; and the width of 

 the body between the pectoral fins, compared with the total 

 length, was as 1 to 7" 15. The lower jaw was rounded and 

 longer than the upper, which was angular, the premaxillaries 

 forming a somewhat obtuse angle with each other. The tongue 

 was rough at the middle with small teeth. The caudal fin was 

 truncate. The dorsal fin had 28 rays, the anal 23 ; they termi- 

 nate in the same vertical, short of the caudal fin. The colour 

 was a uniform brown, with a slight trace of a white edge to the 

 anal fin at the anterior end. The pectoral fins had rounded 

 apices. The lateral line was straight, save for a slight rise and 

 fall above the pectoral fins. 



The following are the measurements of the principal parts in 

 inches : — 



Width of body between pectorals If 



Dorsal, length of base 3f- 



„ distance from tip of snout 6f- 



Pectorals, length 1|- 



Ventrals, length li 



Vent, distance from tip of mandible 6 



Anal, length of base 2| 



Caudal, height 3i 



Eye, longer axis -^ 



„ distance from tip of snout 1^ 



Suctorial disk, length 3 ^ 



„ width 1^ 



Cubiceps gracilis, Lowe, 

 Proc. Zool. Soc. 1843, p. 82; Cat. Fishes Brit. Mus. ii. 389. 



Navarchus sulcatus, Filippi e Verany, Mem. Acad. Torino, ser. 2. torn, xviii. 



p. 187. 



D.11.1. A.^. P. 24. V.1.5. C.v.9+8.v. M.B. 6. 



Elongate, fusiform, compressed. Dark purplish -grey, nearly 

 black on the back, the belly leaden-grey, the fins grey. Clothed 

 with moderately large cycloid scales, of which the exposed part is 

 diamond-shaped. There is a furrow along the side at the mid- 

 dle of the height, and halfway between this and the line of the 

 belly there is another furrow not so long as the upper one. 

 The lateral line is distinct from these, and is placed high up, 

 following the curve of the back, and being straight along the 

 tail. At the sides of the head it is forked, the branches meeting 

 at the suprascapula. In addition to the straight longitudinal 

 furrows already mentioned, the sides of the body are marked 

 with transverse undulating parallel furrows, which at the middle 



