396 
Length 380 ram. without caudal. (Regan and Trewavas.) 
Off New Zealand, Chile. 
Family MALACOSTEIDAE 
Body elongate, deepest at head and tapering backward, ^nout extremely short. 
Eye very large. Mouth enormous, ends of jaws extending beyond bases of pectoral 
fins and jaws not connected with sides of head back of orbit. Lateral edges of 
u PP e r jaw formed by premaxillaries only. Teeth pointed, unequal in jaws, none 
on palate. One or no barbel, but cylindrical muscular band connects symphysis 
» 
of very thin lower jaw with front of hyoid bone. No gill rakers. Body scaleless. 
Dorsal and anal fins alike, far back, opposite. Ho adipose fin. Tail diphycerc- 
al, caudal small and emarginate. Pectoral rudimentary. Ventral slender. 
ANALYSIS OF GENERA 
1 
_a. Small luminous organ below anterior part of eye in males only; no barbel; 
no pectoral fin Photostomias. 
2 -- 
a. A large subocilar luminous organ; pectoral fin present. 
1 
b. Barbel present Aris tostomias. 
b. No barbel Malacosteus. 
- -m- -— - % m n l 
Genus PHOTOSTOMIAS COLLET 
Photostomias COLLETT, Bull. S 0 c. Zool. France, vol.14, 1889, p.291. Type Photos¬ 
to mia s guerni COLLETT, monotypic. 
Thaumastamias ALCOCK, Ann. Mag. Nat. Ejst., series 6, vol.6, 1890, p.220. Type 
Thaumastomias atro x ALCOCK, monotypic. 
Snout short. Fangs fixed, slender, curved, pointed; about 10 in premaxillary 
of which second may be enlarged; 2 long lower front pairs followed on e ch side 
