344 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



U.S.N.M. No. 84229. Zamboanga. Dr. Fred Baker. Length, 233 mm. 

 U.S.N. M. No. 85992. China. A. de C. Sowerby. Length, 41 to 90 mm. Four 



examples, in very poor preservation. 

 U.S.N.M. No. 87059. Foochow. A. de C. Sowerby. Length, 54 to 90 mm. 



Two examples, in poor preservation. 

 A.N.S.P. No. 52883. Hong Kong. Henry W. Fowler, 1929. Length, 168 mm. 



Family EMMELICHTHYIDAE 



Body fusiform, elongate, scarcely compressed. Mouth oblique^ 

 lower jaw projecting. Teeth absent, small, or deciduous. Maxillary 

 rather wide, slips below preorbital. Palate toothless. Nostrils 

 paired. Preopercle entire or with flat thin serrae. Opercle ends in 

 flat point. Premaxillaries greatly protractile, spines reaching occiput. 

 Gill membranes free from isthmus. Gills 4, slit behind fourth. 

 Pseudobranchiae present. Lower pharyngeals with cardiform teeth. 

 Pyloric coeca few. Scales moderate, ciliated. Head scaly, except 

 snout tip. Bases of soft dorsal and anal scaly posteriorly. Lateral 

 line complete. Dorsals separate or continuous, when with free spines 

 between, spines slender and about 15. Soft dorsal low, moderate, 

 naked or with basal scaly sheath. Last rays of soft dorsal and anal 

 extended. Anal with 3 small spines and about 9 rays. Caudal 

 widely forked or emarginate. 



Small trim little fishes, brilliant and active, most of deep water in 

 the Indo-Pacific, The known forms follow. 



ANALYSIS OF GENERA 



a'. Posterior dorsal spines isolated, 13 in number, 

 fci. Maxillary expansion half of eye. 



d. Gill rakers 28 below Emnaelichthys. 



c'. Gill rakers 22 below Dipterygonotus. 



b*. Maxillary expansion 2)4 to 3 in eye; gill rakers 21 below Inermia. 



a*. Posterior dorsal spines connected by membrane, 

 d'. Dorsal spines 11 or 12, rays 9 to 11. 



e'. Dorsal spines 11, hind ones low and last longer than penultimate. 



Erythrocles. 

 e'. Dorsal spines 12, penultimate one long as last and not very low. 



Plagiogenion. 

 d}. Dorsal spines 10, rays 26 or 27 Cypselichthys. 



Genus EMMELICHTHYS Richardson 



Emmelichthys Richardson, Voy. Erebus and Terror, Fishes, vol. 2, p. 47, 1844. 



(Type, Emmelichthys nitidus Richardson, monotypic.) 

 Boxaodon Guichenot, Hist, fisica polit. Chile, Gay, Zool., vol. 2, p. 208, 1847. 



(Type, Boxaodon cyanescens Guichenot, monotypic.) 



Body elongate, slender. Head moderate, attenuated. Eye mod- 

 erate, nearly median. Mouth moderate, very protractile, premaxil- 

 lary spines reaching occiput. Teeth obsolete. Lower pharyngeals 

 separate and like upper with cardiform teeth. Preopercle entire. 

 Lower gill rakers 27 or 28. Pseudobranchiae present. Branchio- 

 stegals 6. Scales rather small, 90 to 100, ctenoid. No lateral ridge 



