308 PROCEEDINGS OF THE ACADEMY OF [Oct.-NoV., 



lower jaw stronger, projecting beyond the upper, at least at the 

 symphysis,^ and forcing the gape into an oblique direction. 



Species of " Atherijiichthys" have been recorded by Gtinther and 

 others from Australia and Tasmania, but they cannot be congeneric 

 with any New World genera.^ The same is true of Atherinichthys 

 nouhuysi Weber^ from New Guinea. The original type of Athe- 

 rinichthys is identical with that of Chirostoma an earlier name. 



Two genera related to Ausiromenidia, Odontesthes and Kronia, 

 have been described from the east coast of South America. 



Odontesthes Evermann and KendalP has a peculiarly pikelike 

 form, produced by the strength of the jaws, and by the positions of 

 the dorsal and anal fins, which are inserted much farther back than 

 in Ausiromenidia; the spinous dorsal originates nearly opposite the 

 anal. The scales are of medium size (about 50 to 70 transverse 

 series). The teeth on the jaws are in two series, and there are 2 or 3 

 groups of vomerine teeth. Kronia, recently described by Ribeiro,^ 

 is said to have 3 linear groups of vomerine teeth; large sublaciniate 

 scales (in 54 series); and the dorsal origin directly over the anus. 

 Perhaps Kronia is synonymous with Odontesthes, but it is not the 

 same as Ausiromenidia.^ 



' ^ The species have all been reexamined as regards this character; the single 

 exception is C. promelas, in which the upper jaw has secondarily become hooked 

 over the lower, somewhat as in the breeding male of Oncorhynchus. 

 * See McCuUoch, Proc. Rov. Soc. Queensland, 24, 1912, p. 49. 



5 Notes Leyden Mus., 32, 1910, p. 229. 



6 Proc. U. S. Nat. Mus., 31, 1906, p. 94. 



' Arch. Mus. Nat. Rio de Janeiro, 17, 1915 (Fauna Brasiliensis, Peixes, Trema- 

 tolepides p. 9). 



^ Aiheriua argentinensis Cuvier and Valenciennes (Hist. Nat. Poiss., 10, 1S35, 

 p. 472) seems to be referable to Odonicsthes. It is described as having scales in 

 ten longitudinal series, they being smaller than in Menidia brasiliensis but larger 

 than in Ausiromenidia laliclavia; and as having the spinous dorsal opposite the 

 anus. 



