488 GEOLOGY OF THE YELLOWSTONE NATIONAL PAKK. 



the Kinderhook group" (p. 14). The fauna of this locality seems to 

 include the following species : Platycrinus sp., Actinocrinus viaticm, Pro- 

 ductus parvus, Strophomena rhomboidalis, Spirifer centronatus, S. striatus, 

 S. extenuatus, S. (Martinia) peculiaris, Spirigera monticola, S. obmaxima, Tere- 

 bratula (Dielasma) burlingtonensis. The Madison limestone contains the 

 following equivalent or identical species : Platycrinus symmetricus of the 

 same type as the form figured by White ; Productus parviformis n. sp., con- 

 sidered to be different from P. parvus M. and W., but the same as P. parvus 

 White; Leptcena rhomboidalis; Spirifer centronatus ; S. striatus var. madlsou- 

 ensis n. var., which I believe to be varietally different from S. striatus of 

 White, though corresponding to it in the fauna ; Syrmgothyris carteri, repre- 

 senting the closely related S. extenuatus 1 of White's fauna; Beticularia (?) 

 peculiaris; Athyris incrassata. 2 



Dielasma utah, which I have recognized in the Yellowstone National 

 Park collections, is probably the same as D. burlingtonense ; at least, with 

 the limited material at my command, I am unable to find any characteristic 

 difference. Some of the species from the other localities also have their 

 analogues in the Madison limestone fauna. S. harveyi White may be one 

 of the two species of Syringopora described below, although the original 

 description is insufficient for identification. Conocardium pulchellum (?) of this 

 report is certainly of the same type as, and may be identical with, C. 

 trigonale White, which is unfortunately unidentifiable, while Euomphalus 

 luxus is represented by Straparollus utahensis, both closely allied forms. 



Hall and Whitfield also describe a similar fauna from the limestone of 

 Dry Canyon, Oquirrh Mountains; and from Ogden, Little Cottonwood, and 

 Logan canyons, in the Wasatch Range, Utah. This fauna is described 

 and figured under the name of the Waverly group, and is said (loc. supra 

 cit, p. 201) to contain an assemblage of fossils considered to be "of about 

 the age of the Waverly group of Ohio 3 and the yellow sandstones of Bur- 



1 Some of the specimens which I have identified as £. carteri can not he said to differ in any 

 essential particular from that figured by White as S. extenuatus. 



'-This form is very close indeed to White's Spirit/era obmaxima in form and general characteristics. 

 Strictly speaking, A. incrassata is a true Athyris, while Spirigera obmaxima belongs to the subgenus 

 Cliotliyris. In point of fact I have not been able to discover spines on White's specimens, and they 

 may prove to be the same as the form which I have called A. incrassata. 



3 The Waverly group of Ohio is now known to he composite in its nature and to contain several 

 different faunas. The lower portion, Herrick has been led to believe, is Devonian, and the upper 

 portion corresponds to the Kinderhook and the Burlington-Keokuk phases of the Mississippian. A 

 close acquaintance with the Waverly faunas, involving several years of collecting and study, has 

 convinced me that Herrick is altogether mistaken in this view. The whole of the Waverly, including 



