400 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The first dorsal spine is concealed; the second spine is produced 

 into a long filament, and is about 1.2 times as long as the distance 

 between the tip of snout and anus in the type (more than 1.4 times 

 that distance in a paratype). The second pectoral ray is similarly 

 elongate, varying from one and three-fourths to almost two times 

 the length to anus. The outer ventral ray, likewise produced, is 1.1 

 times the length to anus in the type and one paratype, and but little 

 shorter than the length of anus in the other paratype. The first 

 dorsal and the paired fins all originate on about the same vertical. 

 The distance from the anus to the ventral base is a little more than 

 half the length of the head. 



Pyloric caeca in two specimens, 24 and 29. 



The color of the preserved specimens, from which nearly all of 

 the scales have been lost, is light brown, with silvery reflections on 

 the abdomen and the sides of the head. The exposed portion of the 

 mandible is dusky. The branchiostegal membranes are brownish 

 black, the gular membranes light. The buccal, branchial, and ab- 

 dominal cavities are lined with brownish black membranes; the 

 branchial cavity has a light margin on its outer wall, along the edge 

 of the opercle and branchiostegal membranes ; the walls of the buccal 

 cavity are not light near the gape. The dorsal fins, including the pro- 

 duced spine, are blackish, except on a narrow lighter basal streak; 

 the anal fin is \ight anteriorly, becoming wholly dark, like the dorsal, 

 posteriorly. The basal region of the paired fins is dark. 



Summary of the differences between Gadomus magnifilis and G. denticulatus. 



G. magnifilis. 



G. denticulatus. 



Length of head • 



Length of orbit in head 



Length of orbit in snout 



Width of interorbital in orbit 



Length of upper jaw 1 



Teeth 3 



Width of premaxillary band in suborbital . 



Distance from anus to base of ventral > 



( iill-rakers on lower limb of first arch 



Height of second dorsal spine 1 



Length of second pectoral ray l 



Length of outer ventral ray x 



Buccal cavity color 3 



Number of pyloric caeca 



2 0.61 

 M.65 



21.3 



2 1.37 

 2 0.335 

 (<) 

 2.0 to 2.4 

 0.38 to 0.47 

 2 21 to 24 

 3 1.185 to 1.40 

 '1.70+to 

 3.97 to 

 ( 8 ) 

 s 24 to 



1.95 

 1.11 



2'.) 



2 0.53 to 

 2 4.2 to 

 2 1.05 to 

 2 1.5 to 



2 0. 285 to 



( 5 ) 



3 1.25 to 

 3 0.33 to 

 3 17 to 

 3 0.58 to 

 3 0.93 to 



3 . 51 to 



'( 7 ) 

 3 61 to 



0.56 



4.3 



1.15 



1.8 



0.30 



•1.65 

 0.36 



21 

 1.05 

 1.41 

 .86 



75 



1 Expressed in hundredths of length from tip of snout to anus. 



2 In specimens over 100 mm. long to anus. 

 •" Including smaller specimens. 



* Distinguishable to unaided eye. 

 5 Not distinguishable to unaided eye. 

 s Wholly dark. 

 7 Lighter anteriorly. 



Although the preceding table indicates the marked differences be- 

 tween G. magnifilis and its nearest relative, G. denticulatus, it is 

 quite probable that it has been derived from that form. The three 

 stations at which this species were dredged are all in the Jolo (Sulu) 



