IPNOPS AGASSIZII. 259 
farther backward than the caudal fin, the third 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, deeply 
forked; lower lobe longer, with a notch at the base of the lowest rays. 
Scales large, thin, bearing concentric strix 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. Longitude. Depth. Temperature, Bottom. 
3376 SOEs 82° 8’ W. 1132 fathoms 36.3° F. Gy. glob. Oz. 
3393 GO UG ING 79° 36’ W. 1020 =“ 36.8° F. Gn. M. 
3407 0° 4S. 90° 24’ 30” W. 885 *§ 37.2° F. Glob. Oz. 
3431 23° 59’ N. 108° 40’ W. 995 « 37° BF. Lt. bro. M. glob. 
Ipnops Agassizii sp. n. 
Plate H, fig. 2, 2a. 
Brox. 105 D:10=9; A, 17-19; V.8; P. 14; C. 19-21; LI). 59-60; Ltr. 5. 
There is not a great deal of difference in shape between this species and 
LI. 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 than one seventh of the total length, depressed, flattened on the 
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 head, 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; laminz 
short; rakers of moderate length, slender, pointed, 5 + 18 on the forward 
edge of the first arch. Gill openings very wide; membranes not united, 
free from the isthmus. Eyes excessively differentiated, 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 
