NO. 9 



NEW DEEP-WATER FISHES MYERS 



Body deepest at junction of head and body, the venter rising in an 

 almost straight line to the beginning of the caudal peduncle. The 

 upper profile of the snout is flat or a little concave, and the top of the 

 head is rounded. The dorsum then rounds slightly to the dorsal origin 

 and thence slopes gradually to the caudal peduncle. 



The measurements of the holotype, in millimeters, are as follows : 

 Standard length 31, greatest depth 10, head length 9, orbit diameter 3, 

 length lower jaw 9, length dorsal base 7.5, length anal base 10, snout 

 2, snout tip to dorsal origin 16, snout tip to pelvic origin 15, snout 

 tip to anal origin 18, least depth caudal peduncle 3.5, length caudal 

 peduncle (from anal) 4.5, longest gill-raker (at angle) 2.5, length 

 caudal fin 10. All longitudinal measurements, save those of the lower 

 jaw and fin bases, are made as to the verticals of the points indicated, 

 on an ideal longitudinal axis of the fish. 



Entire snout and tip of lower jaw hyaline. Cheeks, opercles, and 

 middle area of sides back to above first third of anal base iridescent 

 bluish silvery. From above eye to end of dorsal base the back is black- 

 ish, and there is a dark patch or bar over the origin of the caudal rays. 

 Posterior part of body yellowish. Iris blackish, except for a segment 

 directly under the pupil, which is silvery. Fins all hyaline. 



Below is given a table of the chief dififerences between M. obtusi- 

 rostra and the new species. Those differences which are marked 

 with an asterisk (*) may disappear when specimens of similar age 

 or size are compared. 



M. ohtusirostra 



Top of head and snout continuously 

 convex, the profile of the snout very 

 strongly decurved.* 



Tooth-bearing edge of premaxillary 

 only weakly convex posteriorly.* 



Lower jaw very shallow. 



Depth of cheek (orbit rim to maxil- 

 lary), directly below center of pupil, 

 scarcely half orbit diameter. 



Greatest body depth (at rear of head) 

 enters standard length about 3.5 

 times.* 



No preorbital photophore. 



Branchiostegal photophores 12. 



M. disjuncta 



Top of head rounded, with a median 

 bony crest, the line of the snout, as 

 it slopes down, becoming flat or 

 slightly concave as it approaches 

 upper jaw.* 



Tooth-bearing edge of premaxillary 

 posteriorly with a strongly convex 

 expansion bearing canine teeth.* 



Lower jaw rather deep. 



Depth of cheek equal to over .75 orbit 

 diameter. 



Greatest body depth (at rear of head) 

 enters standard length about 3 

 times.* 



A preorbital photophore present. 



Branchiostegal photophores 11. 



