276 PATAGONIAN EXPEDITIONS I PAL/EONTOLOGY. 



teristic Suprapatagonian, while 4 are Patagonian (2 Juliense and 2 Leon- 

 ense). The presence of 7 species in these beds (Scutella patagonensis, 

 Terebratella patagonica, Ostrea ingens, Panopea quemadensis, Scalaria 

 rugulosa, Valuta gracilior, Balanus varians] is most significant, since 

 these have been found also in the lowermost beds of the whole series at 

 San Julian. 



Thus the palaeontological evidence if we follow Ameghino's divisions- 

 is in conflict with the stratigraphical. 



jo miles north of upper Rio Chalia; beds corresponding to the last 

 locality : immediately below Santacruzian beds, top of marine series. 



* Cidaris anatarctica. *Psammobia patagonica. L * Turritella ambulacrum. 

 J Scutella patagonensis. * Panopea quemadensis. * Turritella patagonica. 



J '* ' Terebratella patagonica. S * Scalaria rugulosa. S * Struthiolaria ameghinoi. 



* Glycimeris ibari. * Infundibulum corrugatum. * Trophon patagonicus. 

 L & S * Ostrea ingen s. S * Natica darwini. Balanus varians. 



Although this list differs a little from that of the last locality (8 species 

 in common), there is much resemblance between both as regards matrix, 

 etc., indeed, both belong apparently to about the same level in the marine 

 series. 



Of these 15 species, 13 have been found at Santa Cruz (marked*); 4 

 are characteristic Suprapatagonian, while 4 are Patagonian (2 Juliense and 

 2 Leonense). The conclusions are identical with those drawn from the 

 last locality. 



Canon near Sierra Oveja, Rio Chico ; extreme top of the series: these 

 beds are interstratified with Santacruzian beds containing Mammalian 

 remains. 



J ^Terebratella patagonica. J & S*Pecten geminatus. S * Scalaria rugulosa. 



L&S* Ostrea ingens. P * Cardium puelchum ( ? ). J Siphonalia noachina. 



These beds, which ought to be, by all means, Suprapatagonian, contain 

 only a single form that is characteristic of the Suprapatagonian beds, 

 while 2 species are found in both Patagonian and Suprapatagonian, and 

 2, Terebratella patagonica and Siphonalia noachina, at the base of the 

 series, in the "Piso Juliense" of Ameghino. The presence of these two 

 species at this locality is entirely opposed to Ameghino's conception of 

 Patagonian and Suprapatagonian beds. 



