296 DISCOVERY REPORTS 



Genus Triplophos, Brauer 

 Brauer, 1902, Zool. Anz. xxv, p. 282; 1906, ' Valdivia' Tiefsee-Fische, p. 98. 



Close to Diplophos, but with a short, bkmt snout, and the body moderately elongate. 

 Two series of conspicuous photophores on each side of the abdomen, and two or more 

 additional rows on the sides of the body. Dorsal 10; origin more than twice as near to 

 end of snout as to base of caudal. Anal 57-61 ; origin immediately behind dorsal. 



A single species. 



Triplophos hemingi (McArdle). 



Photichthys hemingi, McArdle, 1901, Ann. Mag. Nat. Hist. (7), vni, p. 521 ; 1905, Illust. Zool. 

 'Investigator', Fishes, pi. xxxvi, fig. 2. 



Triplophos elongatum, Brauer, 1902, Zool. Anz. XXV, p. 282; 1906, 'Valdivia'' Tiefsee-Fische, 

 p. 99, pi. vii, fig. 4, text-fig. 41. 



Depth of body nearly 8 in the length, length of head 7. Snout shorter than eye, diameter 

 of which is 6 in length of head and about equal to interorbital width. Teeth arranged in 

 two irregular series in the upper jaw and in a single series in the lower; strong, pointed, 

 with smaller ones in the interspaces ; a few small teeth at the anterior end of each palatine 

 and one or two minute teeth on the yomer; surfaces of the mesopterygoids minutely 

 denticulated. Dorsal 10. Anal (57) 61. Pectoral with 10 or 11 rays. Pelvic 6; origin 

 nearer to commencement of anal than base of pectoral. Lower series of photophores 

 consisting of 16 or 17 in front of pectoral, 13 from pectoral to pelvic, 5 from pelvic to 

 origin of anal, and 35-36 (41) from anal to base of caudal; there are about 55 in the 

 upper abdominal series and 43 in the lateral line. 



Described from a single specimen, 205 mm. in length; one of the types of the species. 



Hab. Indian Ocean. 



Apart from a supposed difference in the dentition and some minor differences in the 

 numbers of serial photophores, I am unable to separate the above specimen from 

 Brauer's T. elongatum. The palatine and vomerine teeth are very small in this species 

 and were probably overlooked by Brauer. 



Genus Ichthyococcus, Bonaparte 



Bonaparte, 1841, Icon. F. Ital. (27), Indice [4] and (138**) [2]. 

 Coccia, Giinther, 1864, Cat. Fish, v, p. 387. 



Apparently related to Vinciguerria. Body more or less ovate, compressed. Eyes tele- 

 scopic ; interorbital region very narrow. Mouth small, the lower jaw included and almost 

 completely hidden by the upper jaw; teeth in the jaws minute; vomer and palatines 

 toothless. No pseudobranchiae ; gill-openings very wide; gill-rakers rather short, 

 comparatively few in number. Scales present; cycloid. Dorsal 11-12; origin in front 

 of pelvic, the root of which is much nearer to base of caudal than tip of lower jaw. 

 A long, low, adipose fin. Anal 15-17; origin well behind dorsal. Photophores con- 

 spicuous, arranged in two series on each side of the abdomen. 



