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. m. 



Plate E,fig. 2; Plate XXXIX. figs. 3-6 ; Plate LXXX.fig. i?, Lat. Sijst. 



Br. r. 9-8; D. 91-99; A. 71-77; V. 1 ; P. 25 ; C. 10; LI. ca. 255; A. 

 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 h.alf 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. Pseudobranchi^e small. Opercular spine 

 horizontal, as long as the snout, strong, the ordy 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, 



