VI 



List of Plates. 



XXXIX. Photographic Reproduction of Skull and Lower Jaws of 

 Oxydactylus longirostris. 



XL, Vertebrae and Liml) Bones of Oxydactylus longirostris. 



XLL Map of Stenomylus Quarry. 



XLII. View of an Exposure of Sediment of Stenomylus Quarry. 



XLIIL View of Exposures on Niobrara River in which Stenomylus 



occurs. 



XLIV. Mounted Skeleton of Stenomylus hitchcocki Loomis. 



XL\'. Mounted Skeleton of Diccratherium cooki Peterson. 



XLVL Cephalosilurus fowleri Haseman. 



XLVIL Imparfinis mirini Haseman. 



XLVIIL (i) Bnnocephalus depressus Haseman. (2) Imparfinis 

 kollandi Haseman. 



XLIX. Bnnocephalus depressus Haseman. 



L. Acestridium discus Haseman. 



LL Dorsal and Ventral Views of head of Acestridium discus 



Haseman. 



LII. Platysilurus barhatus Haseman. 



LHI. Astronotus orhiculatus Haseman. 



LIV. Mquidens guaporensis Haseman. 



LV. ^quidens awani Haseman. 



LVL jEquidens duopunctata Haseman. 



LVn. Cichlasoma facettun Jenyns. 



LVIH. Crenicara altispinosa Haseman. 



LIX. Crenicichla simoni Haseman. 



LX. Crenicichla jaguar ensis Haseman. 



LXI. Crenicichla iguassuensis Haseman. 



LXH. (i) Crenicichla santaremensis Haseman. (2) Hetero- 



gramma trifasciatum, var. macilicnse Haseman. 



LXin. Crenicichla dorsocellata Haseman. 



LXIV. Heterogramma agassizi (Steindachner). 



LXV. Heterogramma tceniatum (Giinther). 



LXVL Heterogramma tceniatum, var. pertense Haseman. 



LXVn. Heterogramma corumbce Eigenmann and Ward. 



LXVHL Heterogramma trifasciatum Eigenmann and Kennedy. 



LXIX. Heterogramma borelli Regan. 



LXX. Heterogramma ritense Haseman. 



LXXI. Geophagus brasiliensis, var. iporangensis Haseman. 



LXXn. Geophagus brasiliensis, var. itapicuruensis Haseman. 



LXXHL Rhamdiopsis moreirai Haseman. 



LXXIV. Heptapterus stewarti Haseman. 



LXXV. Rhamdia branneri Haseman. 



LXXX'I. Rhamdia branneri, var. voulezi Haseman. 



