FISHES FROM NORTHEASTERN PACIFIC— CHAPMAN 531 



56.9) ; branchiostegal rays 9 (8 to 9 ; 8.9). Proportions of length with- 

 out caudal: Length of head 4.9 (4.7 to 5.5; 5.15); snout to dorsal 2.5 

 (2.4 to 2.6; 2.52); snout to adipose 1.2 (1.2); snout to pelvics 3.0 (2.6 

 to 3.0; 2.72); snout to anal 1.6 (1.5 to 1.6; 1.55); greatest depth 8.1 

 (7.5 to 9.2; 8.10); length of caudal peduncle 4.3 (4.2 to 5.0; 4.73); 

 dorsal origin to base of middle caudal rays 1.6 (1.6 to 1.7; 1.65); anal 

 origin to base of the middle caudal rays 2.8 (2.8 to 2.9; 2.83). ' Pro- 

 portions of length of head: Diameter of eye 3.7 (2.7 to 4.0; 3.26); 

 length of snout 3.3 (2.4 to 3.3; 2.76); length of upper jaw 1.4'(1.3 to 

 1.6; 1.40); interorbital space 26.9 (6.7 to 26.9; 10.83); depth of caudal 

 peduncle 3.9 (3.9 to 4.6; 4.20). 



The body is long, slender, and moderately compressed. It is com- 

 pletely covered with scales. In the specimens less than 74 mm in 



FiQUKE 67.— Neoscopelarchoides dentatus, new genus and species: Holotype (U.S.N.M. no. 108145), 162 



mm long, from station 102C. 



length the scales have not yet formed. The scales along the lateral 

 Une are considerably enlarged. The small specimens (less than 74 mm 

 in length without caudal) all have a characteristically translucent 

 abdominal cavity. If the fish is held toward a light, the shape of its 

 visceral organs can be plainly seen. The head is moderately com- 

 pressed and is scaleless. The nostrils are a little nearer the snout 

 than the eyes. The eyes, even in the small specimens, are distinctly 

 telescopic. They look dorsally and anteriorly. Around their ventral 

 two-thirds they are encased in black pigment. Below and behind the 

 lens, but on the eyeball, is an oval patch of pearly white material, 

 similar in appearance to the luminescent patches found on the genus 

 Diaphus. There are no other luminescent bodies on the fish. The 

 eyes are separated by only a very narrow interorbital space. In the 

 smaller specimens the interorbital space is proportionately much 

 wider than in the larger specimens because of the fact that a specimen 

 42 to 43 long has an interorbital space of the same width as one 162 

 mm long. The lower jaw extends far behind the eye, almost to a 

 vertical from the upper end of the opercle. 



The bones of the mouth bear a surprismg array of teeth. There are 

 (in the holotype) 10 teeth in a single series on the glossohyal. The 

 most anterior one of these arises ventrally to the bases of the others, 

 on the very tip of the tongue. It is about twice as long as the others 

 and more recurved. The remaining nine are short and stout, not 



