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, 26. 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 measurements. 
MotalMene these selec eceise aeelceseeelssereensicse) ssc (Ca) Oo mnehes 
Mpa hybo Aston CAUGA ere tos. sclcineeloee ama tenes cme cise 6.25 inches = 100 
Body: ; 
Greatest Geptht 252-7. scsee tse eee eae naa eiseeae eee ee ee Pee eee 6 
Meastwdeptl ssc st etm as ar conse ames ae eee cL oe Fey ghee) a ee 2 
WencthoRcandalepedun Cle ease e ee seen ae sense acer eee eee ec eee 6 
Head: 
Ween o theres pe yss see See Re SRS Ee eee cake Bais cote see sane (CX)2 L6L 
Length of masa) laryiseaeceh5- ho 8 Be ee Mk I eee See Pe oe 9 
Menethiofanandibledt. 4-22 eck ae eae esate aa w ae See re eeeye ee ae eee 114 
Wenothvor snout =—= eee SOD GROG EOe Ae Bae, SERCO ORE Re eas oe 8 
Dorsal : 
DISGAMCe ROMA SN OUbEee «= See c eee oe ree Ceres cee oye ar nie eee ce eee 57 
Henpthiotrbasete ce: Shsetk Ws JSC SE Sa See I Seok LeeLee 54 
Greatest height: A-jscu:2 5.<.<c ee hei eis bec a. see tee see eee see (ca) 7 
Anal: 
Distance fromusnoub': 2 oto aie Sache heise ees Seen eee eee 80 
Hennot hoi Dass ,<.- seis ais celee aes orotinetels cises elo sere seein cae rae ae etee einen (Ca) aml 
Greatestiheieht. eos sces sce ese aeesie seoteses soos cesease Snes cecieis (ca) 5 
Pecionalwlenodhpesnasr vse sel aioe esate eine ee tate oes setae one eine eee, aoe ee ota meters oye 8 
DP OVSM AVS =. Ae esisee see debs satis steals Seis TSS SR ea T,10 
ANTG' EMS) Seo set oc Seon oc aa eae Sage Sane SasRoC aoe eareao sopdabensede Sooc esos I, 25 
This species differs from Sudis hyalina as described by Dr. Giinther 
(Cat. Fishes 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. j 
Myctophum crenulare, 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. Head 
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 preopercle. 
Premaxillaries anteriorly on a level of the pupil. Teeth very small, 
present on all the dentigerous bones. Rami 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. 
Nasal bones membranaceous, their edges upturned, forming a horizontal 
