NO. 2273. CERTAIN GENERA OF ATIIERINE FISHES— JORDAN. 311 



(A. hepsetus Linnaeus) in having the rami slender, not elevated at 

 base as usual in Atherine fishes. 



It appears, however, that Atherina hoyeri Risso, the type of Bona- 

 parte's genus Hepsetia^ agrees with Atherina laticeps in this regard. 

 The name Hepsetia must replace Atherinomorus and the genus is 

 unquestionably valid. 



The rami of the lower jaw are very slender behind in Hepsetia, 

 Eurystole, Xenatherina, Thyrina, and in the Australian genus Me- 

 lanotaenla. They are subtriangular in profile, being widened bo- 

 hind in all the species examined of Protistius, Atherinopsis, Ath- 

 erlnops, Basilichthys, Austromenidia, Chirostoma, Menidia, Me77i- 

 hras, Euhhesia, Leuresthes, Lahidesthes, Thyrinops, Atherion, Ath- 

 erina, and Atherinella. The same form is described in I schnomem- 

 hras and Phoxargyrea. 



In two genera an intermediate form appears, the rami being very 

 slightly elevated at base. These are Edopsarwm and Iso. 



1 Fauna Italica, 1836. 



