ORTMANN : TERTIARY INVERTEBRATES. 
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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 11. 
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). 
18. Punta 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 ff.). 
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- 
