44 Windhausen — The Cretaceous- Tertiary 



some material, have been comprised under the name 

 "Region of the Rio Grande," the fossils from there hav- 

 ing been classified by the writer. For the data about 

 Gualichu I am indebted to Dr. Wichmann. The follow- 

 ing localities are united under the title "Region of the 

 Gulf of St. George": Salamanca Peak, Malaspina, 

 Mamelones cle Phledo, Monte Mayor, Colhue Huapi and 

 Valle Alsina. Apart from the invertebrates given in this 

 appendix, the following faunistic elements have 'been 

 mentioned by various writers: bryozoa, corals, stalks 

 of Crinoidea, crayfish-claws and remains of fishes, 

 especially teeth. 



The table in the first place shows the uniformity of the 

 San Jorge in a faunistic sense, in spite of the irregularity 

 of the collections and the imperfection of the material. 

 In the second place it points out the existence of a Ter- 

 tiary element of considerable extent. The following 

 genera have to be regarded as Tertiary : 



Aturia Siphonalia 



Calyptraea Malletia 



Turritella Hinnites 



Struthiolaria Lutraria 



Trophon Balanus 103 



For the present it is not possible to decide as to the 

 occurrence of Ceritliium, asserted by Behrendsen, 104 who 

 for this reason correlated this fauna with the European 

 Paleocene. Ortmann and v. Ihering 105 have especially 

 pointed out the absence of Cerithium in the ancient Pata- 

 gonian fauna. Further Dosinia is very frequent in the 

 Tertiary of Chile and New Zealand, and according to 

 v. Ihering 106 it has to be regarded as an ancient element 

 of the coasts of Archinotis. Accordingly, this form must 

 also be assigned to the Tertiary element. 



On gathering the various data scattered in the publi- 

 cations of Ameghino and v. Ihering, the following species 

 are found represented in the San Jorge as well as in the 

 Patagonian Formation : 



103 See about the Tertiary age of Balanus : Ch. Darwin, A monograph on 

 the fossil Balanidae and Verrucidae of Great Britain, Paleontological 

 Society, London, 1854. 



11,4 Zur Geologie des Ostabhanges etc., second part, p. 30. 



105 Les mollusques fossiles, p. 492. 



100 Ibidem, pp. 298 etc. 



