ORTMANN : TERTIARY INVERTEBRATES. 307 



This would make the Magellanian beds Oligocene in age. 



THE CAPE FAIRWEATHER BEDS ( ? MARINE TEHUELCHE BEDS). 



The Cape Fairweather beds were first described by Hatcher (1897 a P- 

 342). They are of marine origin, and their stratigraphical position is un- 

 conformably on top of the Santacruzian beds (see section, 1. c., p. 344) : 

 this separates them at once stratigraphically from the Patagonian beds, 

 which are below the Santacruzian beds. 



A first, preliminary account of the fauna of these beds has been given 

 by Pilsbry (1897 a )- Further investigations have increased the number of 

 species, and have made necessary a few corrections, so that the list of 

 species known from the Cape Fairweather beds stands at present as 



follows : 



RELATIONS AND DISTRIBUTION. 



1. Terebratclla gigantca Mutation of T. patagonica, Patagonian beds. 



2. Ostrea ingens Patagonian beds. 



3. Pectcn actinodes Mutation of P. geminatus, Patagonian beds; distribution north- 



ward from San Julian, in the Tehuelche beds (v. Ih.). 



4. Mytilus cf. chorus Patagonian beds and Recent (Chili). 



5. Meretrix rostrata Recent (Brazil and Uruguay). 



6. Dosinia meridionalis Patagonian beds and Entrerios beds (v. Ih.). 



7. Panopea pilsbryi. 



8. Golems mamillaris Recent, Chili to California. 



9. CrepiduladUatata Recent, southern Patagonia. 



10. Turritella innotabilis Mutation of T. patagonica, Patagonian beds; closely allied to 



T. cingulatifonnis, Pliocene, Chili. 



11. Trophon laciniatus Mutation of T. patagonicus, Patagonian beds; Recent, Pata- 



gonia. 

 T. 1. var. inornatns also at Darwin Station ; Tehuelche beds (T. varians v. Ih.). 



12. Balanus cf. psittaats Patagonian beds, and Recent, Patagonia. 



13. Balanus cf. trigonus Recent, almost Cosmopolitan (Patagonia). 



14. Balanus Icevis Pliocene, Chili ; recent, Patagonia, Chili to California. 



Indeterminable remains of Pinna, Area, Lucina (or Diplodonta ?), 

 Cardita. 



Of these 14 species, 4 (Ostrea ingens, Mytilus chorus, Dosinia merid- 

 ionalis, Balanus psittacns] are also represented in the Patagonian beds, 

 while we may consider 4 others ( Terebratella gigantea, Pecten actinodes, 

 Turritella innotabilis, Trophon laciniatus} as mutations of Patagonian 



