354 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



cribriform; basisphenoid with anterior lobiform extension; fronto-occipi- 

 tal crest ceasing far from front of frontal; pterygoids edentulous; gill- 

 rakers few. 



Type L. l^itjanus, Bloch. 



ocyuRus. 



PARTIAL SYNONYMY. 



=0cyuru8, Gill, Proc. Acad. Nat. Sc. Pliila., 1862, p. 236, 1862. 

 =0cyurus, Poey, Annals Lyceum Nat. Hist. N. Y., v. 10, p. 60, 1871. 



Interorbital area not flat nor separated from the occipital region, with 

 the median and lateral crests procurrent on it, and with the frontal 

 narrowed forwards; prefrontals with the articular facets arising from 

 diverging V-shaped ridges with jjosterior areas short and excavated; 

 basisphenoid with an anterior lobiform extension ; fronto-occipital crest 

 continued on ethmoid ; pterygoids dentigerous; gill-rakers numerous. 



Type 0. clirysurus = Sparus chrysurus, Bloch. 



RHOMBOPLITES. 



PARTIAL SYNONYMY. 



=:Rhomboplite8, GiU, Proc. Acad. Nat. Sc. Pbila., 1862, p. 237. 

 =Rliomboplites, Poey, Annals Lyceum Nat. Hist. N. Y., v. 10, p. 61, 1871. 



Interorbital area not flat nor separated from the occiptal region, with 

 the median and lateral crests procurrent on it, and with the frontal nar- 

 rowed forwards, prefrontals with the articular facets developed from 

 simple tubercles and not V-shaped ridges; with the posterior areas crib 

 iform ; opisthotics with nearly simple processes ; basisphenoid not lobig- . 

 erous; vomer with an elongated posterior dentigerous crest; pterygoids 

 dentigerous. 



Type Bhomboplites auroruhens=Gentroi)ristes aurorubens, Cuv. & Val. 



TROPIDINIUS. 



PARTIAL SYNONYMY. 



=Tropidiniu8, Gill, (MSS.) ; Poey, Repertorio Fis.-Nat. de Cuba, t. 2, p. 296, 1868. 

 =Tropidiniu8, Poey, Annals Lyceum Nat. Hist. N. Y., v. 10, p. 65, 1871. 



Interorbital area not flat nor separated from the occipital region, with 

 the median and lateral crests procurrent on it, and with the frontals 

 narrowed forwards ; prefontals with the articular facets developed from 

 simple tubercles and not V-shaped ridges, with the posterior areas 

 solid aud somewhat tumid ; opisthotics with bifurcate processes; basis- 

 j)henoid not lobigerous; vomer incurved and toothless behind its chev- 

 ron ; pterygoids toothless. 



Type Tropidinius (lentatus=zApsilMS dentatus, Gmch.= Mesoprion ar- 

 niUa, Poey. 



