Ilesozoic and Ccunozoic Geology and Palaionfology. Ill 



fresh water t3q)es, none of whicli belong to genera peculiar to the 

 Cretaceous or any older rocks, but all to such as are alike common to 

 the Cretaceous, Tertiary and present epochs, with possibly the excep- 

 tion of Goniobasis, whicli is not yet certainly known from the 

 Cretaceous. 



7. That, on the one hand, two or three of its species belong to 

 sections or subgenera ( LejJtesfhes and Veloritina) apparently charac- 

 teristic of the Eocene Tertiary of Europe, and are even very closely 

 allied to species of that age found iu the Paris basin; while, on the 

 other hand, one species seems to be conspecific with, and two congen- 

 eric with (and closeh' related specificall}' to) forms found in brack- 

 ish-water beds on the Upper Missouri, containing vertebrate remains 

 most nearly allied to types hitherto deemed characteristic of the 

 Cretaceous. 



8. That one species of Anomia found in it is very similar to a Texas 

 Cretaceous shell, and perhaps specifically identical with it; while a 

 VivipavHs, found in one of the upper beds, is almost certainly identi- 

 cal with the V. trochiformis of the fresh-water lignite formation of the 

 Upper INIissouri ; a formation that has always, and by all authorities, 

 been considered Tertiary. 



9. That tiie only vertebrate remains yet found in it are those of a 

 large reptilian (occurring iu direct association with the Viviparus 

 mentioned above) which, according to Prof. Cope, Is a decidedly Cre- 

 taceous type, being, as he states, a huge Dinosaurian. 



Ho described from Coalville, Utah, Ostrea soleniscus, Avicula 

 jyrojileui'a, A. gastrodes, Ilodiola midtiltnigera., now Vohella multi- 

 linigera, Cyrena carletoni, Neritina bellatuJa^ iV. patelliformis, iV". 

 carditoides, iV. bannisteri, IV. pisum, IV. pisiformis, Admete rliom- 

 boides, A. subfusiformis, Turritella coalvillensis, T. micronema, T. 

 spironema, Fusiis gabbi, F. utahensis, Turbomlla coalvillensis, Mu- 

 lima chrysalis, E. inconspicua, Melampus antiquus, Valvata nana. 

 P7^l/sa carZe^owt; from the Missouri river below Gallatin City, Montana, 

 Ostrea anomioides^ Corbicnla inflexa, Pliarella pealei ; from Beai- 

 river cit}', on Sulphur creek, Wyoming, Trapezium, micronema, Corbi- 

 cula oiquilateralis, C. secnris, from near Cedar Cit}', Southern Utah, 

 Corbula neniatophora ; from the Bitter creek series, at Point of 

 Rocks, Wyoming, Ostrea iryomingensis, Corbula tropidophora ; from 

 Black Butte Station, Corbicula bannisteri,, 3Ielania ivyomingensis; 

 and from Rock Spring Station, Central Pacific Railroad, Wyom- 

 ing, Corbula undifera and Goniobasis insculpta. 



