274 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Anal fin anteriorly nearly as high as the dorsal, its posterior rays low. 

 The number of rays apparently I, 25, possibly I, 24 or I, 2G. Ventral 

 fins totally obliterated. Pectoral fins placed low, rather short, about as 

 long as the maxillary. Caudal fin short, narrow, apparently forked. 



The coloration is apparently light olive, the sides silvery, with dark 

 punctulations. Fins plain. Peritoneum silvery, underlaid by black 

 pigment. 



Table of measiirevients. 



Total length (ca) 6.60 inches 



Length to base of caudal 6.25 inches = 100 



Body: 



Greatest depth 6 



Least depth 2 



Length of caudal peduncle , 6 



Head : 



Length (ca) 16^ 



Length of maxillary 9 



Length of mandible 11^ 



Length of snout 8 



Dorsal : 



Distance from snout 57 



Length of base ^i 



Greatest height (ca) 7 



Anal: 



Distance from snout 80 



Length of base (ca) 14 



Greatest height (ca) 5 



Pectoral length 8 



Dorsal rays 1. 1^ 



Anal rays 1. 25 



This species differs from Sudis liycdina as described by Dr. Giinther 

 (Cat. Pishes Brit. Mus., v, 420) chiefly in the dentition, canine teeth 



being present on the premaxillaries and palatines, as well as on the 

 mandible. The head is also shorter and the mouth apparently larger in 



proportion. 



Myctophum crentilare, sp. nov. 



Form much compressed, deepest in front of the base of the pectorals, 

 bluntly convex anteriorily, tapering behind. Ventral region much more 

 arched than dorsal. Caudal peduncle long and very slender. Heatl 

 short and high, abruptly rounded in profile, the snout very blunt. Jaws 

 equal, the snout not projecting beyond the mouth. Maxillary very 

 slender, scarcely widened to its tip, and not dilated, its extremity reach- 

 ing beyond the eye to the margin of the jjreopercle. 



Premaxillaries anteriorly on a level of the pupil. Teeth very small, 

 present on all the dentigerous bones. Eami of the mandible nearly par- 

 allel, coming together in a sharp keel below. 



Orbital margin above and in front with a thin membranaceous rim, 

 that in front distinct and formed by the upturned edge of the preorbital. 

 l^asal bones membranaceous, their edges upturned, forming a horizontal 



