BY J. DOUGLAS OGILBY. '* 155 



with small, wart-like papillte. Mouth moderate; lips thick and 

 papillose, the upper without posterior filament; no mental lobe. 

 Premaxillary teeth conical, in two small patches, the outer 

 series enlarged; mandibular teeth forming an interrupted crescentic 

 band, pluriserial, the outer row enlarged and bluntly conical, the 

 rest granular; vomerine teeth granular and unequal. Anterior 

 nostril on the outer edge of the lip, simple. Barbels moderate. 

 Eyes small, sublateral, without free lid. Gill-membranes separate, 

 broadly attached to the isthmus; gill-openings moderate; seven 

 or eight branchiostegals ; gill-rakers in small number; axillary 

 pore present. First dorsal fin originating behind the base of the 

 pectoral; second dorsal longer than the anal; ventrals rounded, 

 with 12 or 13 rays, inserted behind the origin of the soft dorsal; 

 pectoral rounded, with 8 or 9 soft i*ays; caudal pointed. 



Etymology : — evpvs, wide; ladi^os, isthmus. 



Type : — Plotosus elongatus, Castelnau. 



- Distribution : — Northern and eastern coasts of Australia. 

 To this genus also belongs Cnidoglanis lepturus, Giinther. 



OsTOPHYCEPHALUs, gen.nov. 



Body moderately elongate; tail moi'e than twice as long as head 

 and trunk. Skin smooth. Head trigonal, much wider than 

 deep, feebly vermiculated, with a few scattered papillje. Lips 

 rather thin, the upper without posterior filament; mental lobe 

 small. Pi'emaxillary teeth conical, in two small patches, sub- 

 equal; mandibular teeth forming an interrupted crescentic band, 

 pluriserial, the outer series enlarged and conical, the inner 

 granular ; vomerine teeth granular and irregular. Anterior 

 nostril on the outer edge of the lip, simple. Barbels short. 

 Eyes small, lateral, without free lid. Gill-membranes separate, 

 broadly attached to the isthmus; gill-openings moderate; eight 

 branchiostegals ; pseudobranchife present ; gill-rakers in small 

 number; axillary pore well developed. First dorsal fin originating 

 above the base of the pectoral ; second dorsal longer than the 



