Geology and Natural History. 471 



The Clinton fauna (St. Clair limestone) is interesting because it 

 is of the type found on both sides of the Cincinnati axis, and 

 not that of New York. 



The chief interest of this work, however, lies in the Carbon- 

 iferous formations. As stated above, the Mississippian section is 

 nearly complete and continues into the lower portion of the 

 Pennsylvanian of the Upper Carboniferous. The author's best 

 results are found in his discussion of the " Upper Mississippian 

 formations" and "Early Pennsylvanian formations." It is seen 

 that he here restricts the well-known name " St. Louis " to the 

 formation as found about the city of St. Louis, which does not 

 include the Spergen Hill and Warsaw horizons, usually embraced 

 under this term. The author states that the St. Louis, Spergen 

 Hill, and Warsaw " are readily distinguishable lithologic units, 

 two of them having a wide geographic distribution, and all three 

 occupying definite and distinct positions in the stratigraphic 

 column. Together they constitute a group for which the name 

 Meramec, after the river of that name in Missouri, where all 

 three divisions may be seen, is chosen." 



It seems unfortunate that the rules of the U. S. Geological Sur- 

 vey do not permit the use of a term with two values, i. e., as a 

 formation and as a group name. In any event, it would seem 

 preferable that the old and long-established name " St. Louis " 

 should be retained in its present text-book use, i. e., to embrace 

 all the time between the top of the Keokuk and the base of the 

 Chester. Had this been done, the present author's group terms 

 would now be those of other writers; as it is, however, to be up 

 to date, we shall have to write " Meramec " for the old and 

 apparently somewhat indefinite term " St. Louis." We could 

 have more easily adapted ourselves to Meramec as the terminal 

 formation of the group St. Louis. 



The Chester of older writers receives here a far greater exten- 

 sion, is elevated to a group term, and includes the St. Genevieve, 

 Cypress, Tribune, and Birdsville formations. The two latter are 

 here embraced under the old name "Kaskaskia" of Worthen, a 

 term that in the past has often supplanted Hall's name " Chester." 

 The Chester group of Arkansas teems with new species. 



One of the peculiarities of the Pottsville fauna in Arkansas, or 

 in the area south of Missouri island (here called Ozarkia), is 

 the presence of Pentremites. Heretofore this genus was thought 

 to have disappeared in America with the Chester, and strati- 

 graphers have always placed great reliance on this supposed limi- 

 tation. Its occurrence shows paleontologists how unsafe it is to 

 make correlations depending on single species or genera. It is 

 stated in a foot-note that this interesting fauna will soon be 

 described by Dr. Girty. c. s. 



4. Monographie de Vile d'Anticosti (golfe Saint-Laurent); 

 by Dr. Joseph Schmitt. Published by A. Hermann, Paris, 

 1904, pp. i-vi, 1-367, 12 text-figures and a map.— Since 1896, M. 

 Henri Menier of Paris, France, has been the owner of the island 



