130 
Family C01!0STOMATIDAE 
Body elongate. H e ad conic, elongate, compressed. Mouth moderate to rather 
large. Mandibular suspensorium usually directed more or less obliquely back. 
Maxillary with 2 supplemental bones. Teeth moderate, some enlarged or canine 
like. No barbel. Opercle complete. Gill openings wide. Gill arches with long 
gill rakers. Body usually covered with large thin caducous scales. Mo modified 
postorbital luminous organ. Photophores present. Dorsal and anal well developed 
, median or posterior, dorsal usually over or before front of anal. Adipose 
fin usually present. Cadual forked. Pectoral low. Ventral nearly median. 
Bathypelagic. 
ANALYSIS OF GENERA 
OOLlOSTOMATIlvAE. Serial photophores arranged in continuous longitudinal 
rows; pseudobranchiae absent or very feebly developed. 
b_« One series of photophores each side of body; dorsal origin nearly opposite 
anal origin. 
c# Dorsal rays 20, origin little behind anal origin; A. 29; no adipose 
fin 
Bonapartia 
2 
£• Dorsal rays 16, origin little before anal origin; A. 23 to 26; adipose 
fin present 
Margrethia# 
b. Two series of photophores each side of body. 
1 
d# Interorbital rather wide; eyes normal; motrth large; teeth well 
developed; dorsal origin behind ventral 
No additional series of photophores on sides of body, 
1 
f\» Dorsal origin opposite or behind anal origin. 
1 
j*> Premaxillary and maxillary with continuous series of long acute 
