IPNOPS AGASSrZII. 259 



farther backward than tlie caudal fin, the tliird ray lower, very small ; lower 

 portion of eleven (sometimes but ten) free slender rays, some of which ex- 

 tend backward of the adipose fin. Caudal deep, of nineteen rays, deejily 

 forked ; lower lobe longer, with a notcli at the base of the lowest rays. 

 Scales large, thin, bearing concentric striixs that form complete circles. The 

 largest individual has a length of ten inches. 



Blackish ; fins, forward portion of the head and edges of scales lighter. 



station. Latitude. liOogitude. Depth. Temperature. Bottom. 



3376 3° 9' N. 82° 8' W. 1132 fathoms 30.3° F. Gy. glob. Oz. 



3393 7° 15' N. 79° 36' \V. 1020 " 36.8° F. Gn. M. 



3407 0° 4' S. 90° 24' .30" W. 885 " 37.2° F. Glob. Oz. 



3431 23° 59' N. 108° 40' W. 995 " 37° F. Lt. bro. M. glob. 



Ipnops Agassizii sp. n. 



Plate H, fig. 2, 2a. 



Br.r. 10; D.10-9 ; A. 17-19; V. 8 ; P. U; C. 19-21 ; LI. 59-GO ; Ltr. 5. 



There is not a great deal of difference in shape between this species and 

 I. Murrayi. The most obvious points appear in the longer anal fin, the more 

 forward position of the ventrals and the longer space between the ventrals 

 and the dorsal in the present types. Body long, slender, tapering gradually 

 from the head to the base of the caudal, compressed toward the tail. Head 

 little more tlian one seventh of the total length, depressed, flattened on tlie 

 crown, convex on the lower surface, broader than deep. Snout wide, 

 broadly rounded in front, lower jaws forming the anterior edge. Mouth 

 wide, oblique, rising slightly forward; lower jaws curving up in front; 

 maxillary reaching back to the hinder third of the liead, not entering the 

 mouth-cleft, broadened posteriorly, upper edge longer and straighter, hinder 

 edge curving forward ; intermaxillary thin, slender, bearing teeth to its 

 extremity at the angle of the mouth. Teeth very small, subconical, hooked, 

 with swollen bases, in villiform bands on intermaxillaries and mandibles in a 

 group of four or five short series at each outer angle of the vomer, and in 

 a narrow band at the anterior ends of the palatines. Four gills; laminte 

 short; rakers of moderate length, slender, pointed, 3 + 18 on the forward 

 edge of the first arch. Gill openings very wide ; membranes not united, 

 free from the isthmus. Eyes excessively diflerentiated, as visual organs, 

 luminous organs, reflectors, and flash lights, occupying nearly half of the top 

 of the head, separated into two facets by a median ridge; with two low 



