2 Dr. A. S. Woodward on some 



Bravard *, Doering f, Anieghino |, Biirmeister §, and Stelz- 

 ner ||, of wliom the first three consider that its marine fossils 

 indicate an Eocene or Oligocene age, while the two latter 

 place the formation in the Upper Tertiary. 'J'he latest 

 examination of its fish-remains is supposed to have proved 

 its equivalence or homotaxy with the Eocene formations of 

 the northern hemisphere ^. 



Fortunately a considerable number of the Parana fish- 

 remains are the teeth of sharks, which may be supposed to 

 liave had a very wide distribution in the oceans at the time 

 w hen they flourished. The evidence of geological age which 

 they affurd may thus be regarded as of considerable value. 

 I therefore propose to record a few observations on the Elas- 

 mubraneh fossils from the Parana collections in the National 

 JMuseimi of Buenos Aires, the La Plata Museum, and the 

 ISan Paulo Museum, which have been kindly lent to me by 

 Dr. Carlos Berg, Dr. F. P. Moreno, and Dr. H. von Jhering. 

 The loan of these fossils has also enabled me to identify a 

 small series of Parana fish-remains labelled by Bravard in 

 the British Museum. 



1. Baja Agassizi, Larrazet. 



1886. Raja Ayassizii, Larrazet, Bull. Soc. G4ol. Frauce, [3] vol. xiv. 

 p. 259, pi. xiii. figs. 1-6. 



The large dermal tubercles of an extinct skate thus 

 described are still known only from the Parana formation. 

 One typical specimen in the La Plata Museum measures no 

 le.ss than 0*088 m. by 0075 m. across, by O'OS m. in 

 maximum thickness. 



2. Dynatobatis [aranensis, Larrazet. 

 188G. Dynatobatis paranensis, Larrazet, loc. cit. p. 263, pi. xiv. figs. 1 -4. 

 These dermal tubercles evidently belong to a member of 



* A. Bravard, * Monografia de los Terrenos Marines Terciarios de las 

 Cercanias del Parana' (Paraua, 18o8). 



t A. Duering, in Kot a, ' Informe Oficial Com. Cient. Exped. al Rio 

 Negro,' pt. iii. (1«"2) p. 429. 



X F. Amegliino, * Contribucion al Conociraiento de los Mamiferos 

 Fo;ile.s de la Kepiiblica Argentina' (1889) p. 14. 



§ H. Bunneister, ' Description Physique de la R^publique Argentina,' 

 vol. ii. (187t)) p. 219. 



II A. Stelzner, ' Beitrage zur Geologic und Paleontologie der Argentin- 

 ischen Kepublik,' pt. i. (1885) p. 139. 



^ G. de Alessandri, " Ricercbe sui Pesci Fossili di Parana (Ilepubblica 

 Argentina)," Atti It. Accad. Sci. Torino, vol. xxxi. (18'.t6) pp. 715-7->0, 

 with plate. 



