74 Scientific Intelligence. 



lonotus sp. (recalling to the author most nearly H. Herscheli 

 Murch. from Capland described by Salter), Leptoccelia flahellites 

 Conr. and Retzia? sp. 



The study of the above faunas has led the author to make the 

 following correlations : — The Iruya fauna he refers to the Middle 

 Cambrian, or Paradoxides zone of the Swedish section, and he has 

 revised his correlation of Cambrian fossils, previously* described 

 from the Argentine Republic, referring them now, also, to the 

 Paradoxides zone instead of to the Upper Cambrian according to 

 his first conclusion. 



The Lower Silurian fauna (2 and 3) is correlated with the 

 north European "Orthocerankalk." 



No trace of the Silurian (Ober-silur) has been discovered in the 

 region, and the author quotes Prof. Bodenbender as reporting the 

 Devonian as lying, by transgression, immediately upon the Lower 

 Silurian limestone in the neighborhood of Jachal. The Devonian 

 faunas (4 and 5) are found to represent more closely the faunas 

 of the Hamilton and Upper Helderberg formations of New York 

 than any other faunas of the northern hemisphere. 



A review of the various known Devonian faunas of South 

 America has led the author to the conclusion, that several faunas 

 very closely related to each other extend over an immense extent 

 of surface of that region of the earth. Also that the Devonian 

 fauna of Capland is intimatety associated with them. These 

 faunas correspond closely to those of the Upper Helderberg and 

 Hamilton formations of North America. All belong alike with 

 them either to the younger Eodevonian or to the older Mesode- 

 vonian age, while the older Eodevonian and the younger Meso- 

 devonian and the Neodevonian are not represented, paleontologi- 

 cally, at any point in the whole region, so far as at present 

 known. 



The fossils referred to in this interesting report were collected 

 by Professors Bodenbender and Brackeubusch, and Drs. Berg,. 

 Valentin and Hettner. h. s. w. 



2. Volcanoes of North America ; a reading lesson for students 

 of geography and geology • by Israel C. Russell, pp. 1-346, 

 plates 1-16, figures 1—7 1- 1897. (The Macmil Ian Co.)— Profes- 

 sor Russell introduces the general reader for the first time to a 

 particular knowledge of the volcanoes of the North American 

 continent, and to the peculiar phenomena and physical features 

 traced directly to volcanic action. In the first chapter (pp. 

 1-126), the characteristics of volcanoes are explained by reference 

 to those of sundry types found in all parts of the world. The 

 selection of these examples is wisely chosen, because of the fuller 

 knowledge we possess of volcanoes situated in the midst of the 

 older civilized countries than of the American volcanoes, equally 

 good as illustrations, but the very existence of many of which has 

 been learned within the last halt century. A brief chapter on the 



* Kayser : Ueber primordiale u. untersil. Foss. aus der Argentinischen Republik. 

 Palaeontographica, Suppl. 1878. ' 



