1884.] NATURAL SCIENCES OF PHILADELPHIA. 129 



Trachynotus cayennensis. 



Trachinotus cayennensis Cuvier & Valenciennes, H;st. Nat. Poiss., viii, 

 1831, 417 (Cayenne) ; Giinther, Cat. Fish. Brit, Mus., ii, 1860, 485 

 (copied). 



? Trachinotus paitensis Cuv. & Val., op. cit., viii, 1831, 438 (Peru). 



Nothing is known of this species except what is contained in 

 the two meagre descriptions noticed above. No difference is 

 indicated by which the Pacific Coast fish (paitensis) is to be 

 known from the Atlantic one. Both appear to diflfer from T. 

 carolinus in the still longer vertical fins. • 



Trachynotas marginatus. 



Trachinotus marginatus Cuvier & Valefiiciennes, Hist. Nat. Poiss., viii, 

 1831, 411 (Montevideo), 



This species appears to be allied to Trachynotus rhodopus and 

 T. goreensis, but the description is too brief to give much idea of 

 its relations. 



Becapitulation, 



We have in this paper admitted eight species of Trachynotus, 

 as found in American waters. Some doubt is attached to the 

 nomenclature of some of them. We give in the following list a 

 brief indication of the questions remaining to be solved in each 

 case : — 



Genus TBACHTNOTUS Lac^pfede. 



1. T. glaucus Bloch. 



2. T. fasciatus Gill. 



3. T. kennedyi Steindachner (possibly to be considered as a geographical variety of 



T. rhomhoides or of T. ovatus). 



4. T. rhomboides Bloch (possibly identical with the East Indian T. ovatus Linnaeus ; 



if so, to take the latter name). 



5. T rhodopns Gill, Very impt-obably identical with T. g'treentis Cuv. & Val.; pos- 



sibly identical with 7". maxillosuB Cuv. & Val., both of them being African 

 species of prior date. Possibly not really found in the Pacific). 



6. T. carolinus Linnseus (possibly not occurring in the West Indies or in the 



Pacific). 



7. T. cayennensis Cuv. &, Val. (imperfectly described; possibly the Pacific form of 



T. paitensis is distinct). 



8. T. marginatus Cuv. & Val. (imperfectly described and doubtful). 



