ORTMANN : TERTIARY INVERTEBRATES. 49 



8. Port of Deseado (Port Desire) ; on the eastern coast of Patagonia at 

 about 48 S. L. 



9. Port Madryn ; New Bay, on the coast of the territory of Chubut. 



10. Shore of Salt Lake; 10 miles north of the mouth of the Rio Chico 

 (northern tributary of Rio Santa Cruz). 



11. Upper Rio Chalia; foothills of the Cordilleras; Rio Chalia=Rio 

 Shehuen, South branch of Rio Chico. 



12. jo miles north of Rio Chalia; with reference to locality u. 



13. Canon near Sierra Oveja ; on the Rio Chico, at about 70 W. L. 



14. Shell Gap ; on upper Rio Chico, foothills of the Cordilleras. 



15. Mayer Basin; west of latter locality, in the Cordilleras. 



16. Arroyo Gio ; called " Basalt Canon " in Hatcher's map; near Lake 

 Gio (east of Lake Pueyrredon). 



17. Lake Pueyrredon ; in the Cordilleras, west of latter locality. Most 

 of the fossils are from the "Rio Tarde Section" described by Hatcher 

 (1900 a, p. 89, 100). 



1 8. Pmita Arenas; on the banks of the Rio de las Minas at Punta 

 Arenas, Straits of Magellan ; section described by the present writer 

 (1898, p. 478 fif.). 



All these localities display Patagonian beds ; the last one is also the 

 type-locality for the Magellanian beds. 



The Cape Fairweather beds were first observed by Mr. Hatcher at Cape 

 Fairweather, Port Gallegos, at ca. 51^ S. L. on the eastern coast of Pat- 

 agonia (see Hatcher, 1897, a )- Apparently contemporaneous deposits 

 have been found at San Julian, Darwin Station, and at Lake Pueyrredon. 



'In the following pages I shall give first a systematic account of all the 

 fossil species represented in Mr. Hatcher's collections. As will be seen, 

 these collections although not all of the species previously recorded from 

 Patagonia are represented are by far the largest ever made in that region. 

 The richness of the material has enabled the writer to study some of the 

 forms more closely, and thus it is not surprising that in some cases his 

 systematic views do not fully agree with those of previous authors. But 

 I trust that all changes introduced here are well supported : in most of the 

 cases referred to, formerly distinct species have been united, and such cases 

 are most apt to be found when a large material for comparison is at hand. 



The systematic part is followed by chapters on the Patagonian, Magel- 

 lanian, and Cape Fairweather faunas in general, discussing their palaeon- 



