1 6 GIRTY 



acquaintance with Western faunas now seems to indicate that 

 the associates of species found in the McCloud Hmestone and 

 the "McCloud shale" are much more widely spread. The 

 fauna of the McCloud limestone is characterized by the pres- 

 ence of Schzuagerina in abundance and by the large gastropod 

 Omphaloti'o chits whitneyi. The Oinfhaloti'ochus beds appar- 

 ently recur in Nevada, and probably are to be correlated with 

 the lower portion of the Hueco formation. At this horizon 

 Schwagcrina {?) is found in abundance, and a series of large 

 Trochoid shells which may prove to belong to the genus Oinphal- 

 otrochiis but not without a certain modification of the generic 

 diagnosis given by Meek. The " McCloud shale" may pro- 

 visionally be correlated with the upper Hueconian. A striking 

 faunal feature which these 2 horizons possess in common is a 

 very large and slender Fiisidina, probably F. elongata Shumard. 

 It cannot be said positively that the same species are associated 

 with these genera in every case, for the fossils have been ex- 

 amined at different times and in a preliminary way ; but I be- 

 lieve that the faunas of the Trans-Pecos region, with aspect more 

 or less modified, will be found to range through New Mexico, 

 Arizona, Utah, Nevada, and California. Less abundant evi- 

 dence is at hand with regard to Oregon, Washington, and Idaho, 

 but doubtless the same seas and the same faunas occupied those 

 areas as well as the western reaches of the British possessions, 

 for the Alaskan faunas are certainly related to those of California, 

 and also to those of the Trans-Pecos region. 



No faunas have yet been obtained from Alaska which I feel 

 confident can be referred to the Lower Carboniferous.' The 

 typical Mississipian is certainly absent as far as evidence has 

 come to hand, and but one occurrence of a fauna definitely re- 

 lated to the Lower Carboniferous of California (Baird) has been 

 found. The Upper Carboniferous faunas present many novel 

 and striking features, but their relationship to the Upper Car- 

 boniferous of California is clear and unmistakable. Naturally 

 less close, though still distinctl}- traceable is a correspondence 



'There has recently come into my liands a good collection from the Cape 

 Lis burne region which can safely' be called Lower Carboniferous. Its affinities 

 are more with the Spirifct- mosquciisis zone of Russia ^han with the typical 

 Mississippian. 



