A NEW GENUS OF GANOID FISH. 469 



central rays, which spring from the termination of the vertebral axis, is f of 

 an inch, and the greatest breadth across the fin-rays is f of an inch. 



A sharp pointed style, or free bony process, covered with a continuation of 

 the scales of the body, projects outwards for ^ of an inch to the left side of the 

 centre of the fin-rays of the tail ; seven rays rising above, and six rays below, the 

 line of its projection. This appears to be the termination of the vertebral column 

 prolonged beyond the body, and lying among the fin-rays of the tail. It reminds 

 one of a somewhat analogous but much greater extension of the vertebral 

 column, prolonged, indeed, through the caudal rays altogether, and even bearing 

 additional fin-rays of its own, which exists in various extinct fossil fishes. (Plate 

 XXXI. fig. 3.) 



The Colour of the fish is a uniform purplish brown above, shading off on the 

 sides, and below, to a yellowish white ; and the fish, when preserved in spirits, 

 shows a faintly mottled appearance over the body, due to the whitish edges or 

 lines at the junction of the scales shining through the adjoining scales. 



The fins are like the body in colour, the scaly fin-rays being also dark, but 

 the margins of the fins are generally lighter; the base of the pedicle of the 

 pectoral fin is light in colour like the belly of the fish, and there is a black spot 

 on its distal part, and at the base of its fin-rays, which are of a brown colour. 



The measurements of this male fish are as follows : — 



Length, or Longitudinal Measurements. 



Total length, from point of snout to the extremity of caudal fin-rays, rather 

 more than \2\ inches. 



Do. to caudal extremity of body, 11|§ inches. 



Of head, above, from snout to commencement of scales of body, \% of an 

 inch. 



Laterally, from tip of snout to superior and posterior angle of operculum, ^% of 

 an inch. 



From point of snout to base of first dorsal finlet, 5f inches. 



From base of first dorsal finlet to extremity of caudal fin-rays, 6-| inches. 



From point of snout to anal opening, immediately in front of base of anal 

 fin, 11£ inches. 



From anal openings to extremity of caudal fin- rays, l-^ inch. 



Of central caudal fin-rays from extremity of body (not including style), ^ 

 of an inch. 



Breadth, or Transverse Measurements. 



Of head across the widest part, over opercular plates, rather more than ^ of 

 an inch. 



Of body behind the origin of the pectoral fins, f of an inch. 



VOL. XXIV. PART II. 6 L 



