Geology and Natural History. 469 



two sides of the Cincinnati geanticline, and especially in connec- 

 tion with the Wabash axis, is in the Richmond faunas situated to 

 the northwest of the latter axis about Wilmington, Illinois, and 

 Delafield, Wisconsin, and that to the south, especially as seen 

 about Madison, Indiana. It is true that these Richmond faunas 

 have many species in common and it is probable that they are 

 not synchronous, so that there may have been land in southern 

 Indiana at the time when the higher Richmond appeared in 

 northeastern Illinois. This may mean that no true axis or 

 u parma" was in existence during Richmond time, but it does 

 seem to show that the Wabash parma at least indicates the strike 

 for the then highest land. During Silurian time, this parma was 

 a bar to the northward spreading of the Clinton and probably, 

 also, of the Waldron formation. In fact, all the post-Clinton 

 Silurian faunas to the north of the Wabash and east of the Cin- 

 cinnati parmas are, in facies, more decidedly that of New York, 

 while those south and west of the same barriers have another 

 relationship. The fact that all these faunas have species in com- 

 mon goes to show that the Wabash axis was not at all times a 

 complete barrier to the intermigration of faunas or that the Cin- 

 cinnati axis was crossed by the sea somewhere in Kentucky or 

 Tennessee. The dissimilarities on the two sides of the Cincinnati 

 axis indicate that the Wabash axis had some effect on the dis- 

 semination of the faunas. 



In regard to some of the species described, it seems desirable 

 to make a few statements. Trimerella sp. appears to be a Mono- 

 morella, because the platform is not excavated, as may be seen in 

 the cast, not having the two cones so characteristic of the former 

 genus. Stropheodonta corrugata has been recently studied by 

 the writer in specimens from the Clinton of Pennsylvania, and 

 these prove the species to be a Rafinesquina. Pholidostrophia 

 niagarensis is probably a Brachyprion, as it has radiating stria?. 

 Orthis flabellites Foerste is hardly the well-known shell formerly 

 passing in America as O.flabellulum. It looks more like forms 

 of the 0. dacidsoni type. Eatonia goodkmdensis cannot be an 

 Eatonia as it has a dorsal sinus, the reverse condition of this 

 genus. It is probably a pentameroid of the genus Parastrophia. 

 Meristina princeps is known to be a true 3/eristella, and cannot, 

 therefore, be referred to Meristina. The Indiana shell seems to 

 be related to Meristina maria, if the stria? mentioned are internal 

 markings. charles schuchert. 



2. Report on an Exjjloration of Ekwan River, Sutton Mill 

 Lakes and part of the icest coast of James Bay ; by D. B. Dow- 

 ling. — This is "Part F" of the fourteenth AnnuarReport of the 

 Geological Survey of Canada. It is particularly interesting on 

 account of the fauna described by Whiteaves. In the Sutton 

 Mill Lakes region, the Cambrian is also exposed and is regarded 

 by Dowling as of the same age as that on the east shore of Hud- 

 son Bay, described many years ago by Bell and Low. In the 

 latter region, the quartz conglomerates, quartzites, and sand- 



