. STOMIATIDAE 309 Genus Odontostomias, gen. nov. Elongate; head short. Cleft of mouth straight; jaws rather strong. Teeth tapering to sharp ends; first tooth in upper jaw rather small, fixed; second long, depressible, followed by 2 or 3 outer small fixed teeth and i inner stronger depressible tooth; lower jaw with a pair of small depressible teeth at the symphysis, ., l^-t^^ , /,mx. a strong fixed fang on either side, followed by an inner depressible tooth and 3 or 4 outer fixed teeth; maxillary teeth all small, more or less erect; two groups, each of i to 4 teeth, on the vomer; 2 to 5 teeth o
. STOMIATIDAE 309 Genus Odontostomias, gen. nov. Elongate; head short. Cleft of mouth straight; jaws rather strong. Teeth tapering to sharp ends; first tooth in upper jaw rather small, fixed; second long, depressible, followed by 2 or 3 outer small fixed teeth and i inner stronger depressible tooth; lower jaw with a pair of small depressible teeth at the symphysis, ., l^-t^^ , /,mx. a strong fixed fang on either side, followed by an inner depressible tooth and 3 or 4 outer fixed teeth; maxillary teeth all small, more or less erect; two groups, each of i to 4 teeth, on the vomer; 2 to 5 teeth on each palatine; a single pair of teeth on basibranchials or none. Teeth on gill-arches in pairs. Postocular luminous organ well developed (d* .'') or absent (? .''). Dorsal 20-23. Anal 23-26; origin nearly below that of dorsal. Pectoral 7-9, without isolated ray. Pelvics 7-rayed, well behind middle of length. Two species. Genotype: Odontostomias mtcropogon, e/?o. Examination of the skulls of the fishes of this genus shows Fig. 17. Upper view of skull that it belongs to the group containing Opostomias, Flagello- of Odontostomias mkropogon. stomias, Thvsanactis and Leptostomias, distinguished by the ("^-^ «/'o-epiotic;; , ' 111 r • 1 T l^t^- lateral ethmoid; meth. absence of post-temporals and the presence of panetals. In mesethmoid;/.. parietal ;/.m^. the form of the ethmoid region this genus seems to be nearest praemaxillary; pto. pterotic; to Opostomias, but diff'ers in having no isolated pectoral ray, ^of^- supra-occipital. and in the fangs of the lower jaw not perforating the praemaxillaries when the mouth is closed. The structure of the anterior part of the praemaxillaries bears some resemblance to that found in Thysanactis, but the median process is much less developed and the lateral projections are narrower. Odontostomias micropogon, St. 269. 26. vii. 27. 15° 55'00" S, 10° 35'00" E. 4^^ m. net, horizontal, 600-700 (-0) m.: 2 spe
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