220 PROCEEDINGS OF THE ACADEMY OF 



collected, the lower lobe of the caudal fin is subtruncated behind, but perhaps 

 is abnormally so. To this species are possibly referrible the specimens from the 

 island of Cordova, enumerated under the head of E. coneolor by Gunther. The 

 Aspinwall type may be named Euschistodus analogus. 



Euschistodus declivifrons Gill. 



Euschistodus declivifrons Gill, Proc. Academy of Natural Sciences of Phila., 

 1862, p. 37. 



Glyphidodon declivifrons Gunther, Catalogue of the Fishes in the British Mu- 

 seum, vol. iv. p. 38. 

 This species extends from Cape St. Lucas to Panama, where a fine adult 



specimen was obtained by Capt. Dow. 



Genus GLYPHIDODON Lac. 

 Glyphidodon Troschelii Gill. 

 Glyphidodon Troschelii Gill, Proc. Academy of Natural Sciences of Phila., 

 1862, p. 150. Gilnther, Catalogue of the Fishes in the British Museum, 

 vol. iv. p 36. 

 Hab. Cape St. Lucas. 



Genus CHROMIS Cuvier. 

 Heliases Cuv. et Val. 

 Furcaria Poey. 

 Heliastes Lowe, Gunther. 



The genus Chromis was especially established upon the Spams ckromis of 

 Linna;us,by Cuvier, in the year 1815, in the " M^moires du Museum d'Histoire 

 Naturelle ;" and therefore the name must be retained for that type, while the 

 bold of the Nile must assume the name Tilapia, as M. Auguste Dumeril and 

 the author have shown. 



I am not yet able to perceive any generic distinction between Chromis and 

 Furcaria, although Prof. Poey was quite correct in his statement that the 

 latter has sometimes seven branchiostegal rays, as he has forwarded to me a 

 preparation of the F. puncta, exhibiting that number. I have myself dissected 

 out a membrane with six rays. 



Chromis atrilobatus Gill. 

 Synonymy. 



Chromis atrilobata Gill, Proc. Academy of Natural Sciences of Phila., 1862, 

 p. 149. 



Heliastes marginatus pt. Giinther, Catalogue of the Fishes in the British Mu- 

 seum, vol. iv. p. 64. 



The color is dark-green, tinged with olive above, and lighter below, while 

 there is a very distinct sulphur spot behind the dorsal fin. The head above 

 is very dark, light-green on the sides, silvery on the preorbital region. The 

 soft portion of the dorsal fin is blackish, except the hinder portion (four or 

 five rays), which is yellowish. The anal fin is greenish, dotted with black, 

 and with the spines green. The caudal fin is greenish yellow, dotted with 

 black, with a black band along each lobe, and with the margins above and 

 below bordered with greenish. The pectoral and ventral fins are greenish ; 

 the former black at the base. 



The snout is rather shorter than the eye. The teeth of the outer row are 

 enlarged, and behind them is a narrow band of scattered ones. 



There are four longitudinal rows of scales between the median dorsal row 

 and the lateral line. 



This species is apparently as closely related to the Chromis puncta ex Poey 

 as to the Brazilian C. marginata, or Heliastes marginata of Castelnau, with 

 which it has been, on too slight grounds, identified by Dr. Gunther, and in 



[Sept. 



