168 DEEP SEA FISHES. 
single filamentary ray. Vent far behind the ventrals. Male with a genital 
cage, behind the anal aperture, enclosing a prominent anal papilla. Pyloric 
appendages few. 
The species described immediately below appears to belong to this genus, 
though slight changes in the characterization are necessary to admit it. 
Cataetyx simus sp. n. 
Plate E, fig. 2; Plate XX XIX. figs. 3-6 ; Plate LXXX. fig. 2, Lat. Syst. 
Br. r. 9-8; D. 91-99; A. 71=77; V. 1; P. 203 Cs 103 LI. ex, 255. 
to D. ca. 40. 
Compressed, but thick above the body chamber, tapering to slender near 
the end of the tail, depth nearly two thirds of the length of the head. Body 
cavity somewhat more than half of the total length. Head long, one fourth 
of the total without the caudal, or three thirteenths of the entire length, 
wider than high in the posterior half, much wider than deep at the eyes and 
forward, outline of top concave longitudinally or broadly convex from cheek 
to cheek. Interorbital width equal to length of orbit. Snout twice as long 
as the eye, twice as wide as deep, very broad and bluntly rounded as seen 
from above, and slightly bent upward as viewed from the side. Mouth very 
wide ; cleft subtending the anterior portion of the orbit ; maxillary subtend- 
ing the entire orbit and equalling it in width at the end, where the lower 
angle is a right one while the upper is prolonged and acute with a blunted 
apex. Teeth equal, small, in villiform bands on jaws, vomer and palatines. 
Vomerine band V-shaped, the angle forward and much curved downward 
into the mouth. Eye small, half as long as the snout, its length equal to 
the width of the interorbital space, one eighth of the length of the head, di- 
rected obliquely out and upward. Anterior nostril tubular, over the maxil- 
lary; posterior half way from the anterior to the eye. Gill openings wide ; 
membranes not united, free from the isthmus. Gills four, a slit behind the 
fourth. Three short, compressed gill rakers developed on the first arch. 
Branchiostegal rays nine to eight. Pseudobranchiz small. Opercular spine 
horizontal, as long as the snout, strong, the only spine on the head. Bones 
firm; occipital crest moderate ; a low internarial prominence. Genital cage, 
or niche, firm cartilaginous, longer than the orbit, with a median keel below, 
folding upward against the first anal ray, posteriorly (superiorly) with a 
large tri- or quadrangular opening within which the genital papilla is located, 
