36 THE VOYAGE OF H.M.S. CHALLENGER. 



and from which I drew up a diagnosis, must belong to another and distinct species. Its 

 pectoral fins and manibulary appendages are, however, too much injured to allow of its 

 characteristics being ascertained. I take now this opportunity of giving a diagnosis of 

 the true Exocoetus solandri : — 



D. 12. A. 11. 



Form of the body very slender, its depth being only one-seventh of the total length 

 (without caudal), the length of the head one-fifth. Snout rather long and pointed, the 

 mandible projecting ; eye a little shorter than the snout, and two-sevenths of the length 

 of the head. 



The anterior part of each mandible is furnished with a broad, delicate, black skinny 

 flap, bearing on its edge several cirrhi, some longer than others, as long as the eye. The 

 dorsal fin is very high, its longest (middle rays) extending to the middle of the upper 

 caudal lobe ; the anal is only half as high, its first ray being opposite to the third or 

 fourth of the dorsal. Pectoral fin reaching to the end of the base of the dorsal ; its 

 upper ray simple, two-thirds the length of the third, the second ray forked, the third the 

 longest. Ventral fin inserted midway between the root of the caudal and the eye, and 

 reaching to the caudal. (Scales lost.) Silvery with greenish back; three broad (rose- 

 coloured ?) bars cross the abdomen in front of the ventral fins ; another bar behind the 

 ventral, and a more indistinct one across the front of the base of the anal fin. The 

 greater part of the dorsal fin, the postero-inferior half of the pectoral, and the ventrals 

 black ; an oblique band across the lower caudal lobe and the outer half of the anal fin 

 blackish. 



The specimen is 5| inches long. 



Exocoetus naresii, n. sp. (PI. I. fig. A). 



D. 10. A. 8. L. lat. 45. 



Allied to Exocoetus comatus, but with less dorsal rays and longer fins ; a single 

 black, very long and broad, cutaneous appendage, which fringes the lower jaw in its 

 entire circumference, does not c^uite extend to the root of the ventral fin ; it is 

 supported by a mid-rib of a whitish colour. The pectoral fin extends to the last dorsal 

 ray, the ventral to the root of the caudal. The ventral is inserted midway between the 

 head and the root of the caudal. Dorsal fin rather low. The height of the body equals 

 the length of the head without snout, the length of the head being one-fourth of the 

 total (without caudal). Snout shorter than the eye, which is one-third of the length of 

 the head ; interorbital space scarcely concave, broad, its width being more than the 

 diameter of the eye. Pectoral blackish, with the exception of the three or four lower 



