DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 67 



IPNOrs MKRRAYI, Gunther. (Figures 07, G8.) 



Ipiiops Miin-uiii, GuNTiiEU, Aim. ami Mag. Nat. Hist., 1878, ii, 187; Clialleuger Report, xxii, 1!)1, jil. xLix, 

 fig. B. 



Body elongate, cylindrical; tail compres.sed beliiud; head depressed. The depth of the 

 trunk diniinislie.s lint little Itackwards, and i.s contained l-'tA times in the total length, witli- 

 out caudal; tlie length ot the liead is one-sixtli of the total. Head l)road, much broader 

 than deep, its greate.st depth being two-thirds of its length. Snout broad, much depressed, 

 with obtusely rounded anterior profile; cleft of the mouth very wide, the maxillary moder- 

 ately dilated behind and extending beyond the middle of the length of the head. J\Iau- 

 dible projecting beyond the upper Jaw, broad, but owing to the depressed form of the snout 

 its upper surface is nearly entirely at the lower side of the snout. Infraorbital chain of 

 bones very narrow, wedged in between the transparent lamina and the maxillary, with four 

 very distinct apertures leading into the mucous duet. The upper surface of the head, includ- 

 ing the snout, is wholly covered by the two coruea-Iike lamin;e of the luminous apparatus. 

 They are closely attached to each other along the median line, each being divided by a 

 shallow transverse ridge into a larger anterior and a smaller posterior portion. The ridge 

 turns forward near and iiarallel to the median line, and marks the course of a superficial 

 mucous duct. 



The gill lamina^ are well developed and the gill rakers long, needle-shaped, closely set, 

 about 22 in number on the outer branchial arch. 



The vent is nearly twice as distant from the root of the caudal fin as from the end of 

 the snout, and rather more than the length of the head from the gill opening; it is placed 

 between the ventral tins. 



The dorsal tin commences immediately behind the vertical from the vent; it is short, 

 Init its longest rays are twice as high as the body. Origin of the anal midwaj' l)etween the 

 vent and the root of the caudal, comp(ised of rays whi<!h are more slender and shorter than 

 those of the dorsal. Caudal fin narrow, subtruucated, more than half as long as the head. 

 Pectorals rather feeble, lateral, as long as the caudal, and extending to the ventrals. Yen- 

 trals are composed of stronger rays, horizontally placed and somewhat distant from each 

 other, as is frequently found in fishes habitually moving on the bottom ; they slightly exceed 

 the pectorals in length. 



The scales are large, thin, deciduous, forming only six longitudinal series on each side 

 of the trunk. Lateral line faintly indicated along the middle of the body; the muciferous 

 channels on the head are also narrow, with small apertures. Brown, fins colorless. Buccal 

 and branchial cavities and lower side of head black. {Giuifher.) 



Eadial formula: D. 10; A. 13; 1M4; V. S; L. lat.oS. 



The GhaUekger obtained it from the coast of Brazil, station 124; depth, 1,000 fathoms 

 (one specimen, 4^ inches long). Xear Tristan da Cunha, station 133; depth, 1,900 fathoms 

 (two specimens, oh inches long); and north of Celebes, station 198; depth, 2,150 fathoms 

 (one specimen, 4 inches long). 



It was also obtained by the Blake, station ccxxxiii, lat. 24'= 36' N., Ion. 84° 0.5' W., 955 

 fathoms (one specimen), and station Lxvi, off Bequia, 1,507 fathoms (one specimen). 



Family RONDELETIID>E, Goode and Bean. 



Body more or less compressed, scaleless. Head nalced. No barbels. Mouth large. 

 Margin of the upper jaw formed by the premaxillaries only. Teeth coarsely granular. 

 0])ercular apparatus complete; its bones very thin, membrane-like. No adipose fin. Dor- 

 sal fin far back; short and low; inserted opposite the anal. Pectorals short, placed rather 

 low. Ventrals present, abdominal. Gill opening very wide; membranes deeply cleft, free 

 from the isthmus. Pseudobranchi;e absent. 



