226 REPORT UNITED STATES GEOLOGICAL SURVEY. 



LIST OF FOSSILS OF TIIE WASATCH GROUP COLLECTED IN WHITE 

 RIVER VALLEY, COLORADO. 



1. TJnio shoshonensis White. 



2. TJnio u-asliahiensis Meek. 



3. Physa pleromatis Wliite. 



4. Goniobasis tenera Hall. 



5. Yiviparus paludinwformis Hall. 



NOTES ON THE WASATCH FOSSILS OF WHITE RIVER VALLEY. 



1. TJnio shoshonensis Wliite. 



This species is described in Powell's Report on the Geology of the 

 Uinta Mountains, p. 12G, the types having been collected from differ- 

 ent portions of the Green River Group in Southern Wyoming. Not only 

 this, but also all the other species of the foregoing list, except Physa ple- 

 romatis, are known to range from the Wasatch Group into, and part of 

 them entirely through, the Green River Group. 



2. TJnio washalciensis Meek. 



Mr. Meek described this species in the Aim. Rep. TJ. S. Geol. Sur. 

 Terr, for 1870, p. 314. It is quite a common species in both the Wasatch 

 and Green River Groups, but it is seldom, if ever, found well preserved. 

 Among typical examples of this species were found some that are at 

 least one-third larger than Mr. Meek's types. Being only in the con- 

 dition of casts, their specific determination was not satisfactory, and it 

 is possible they represent a new species. 



3. Physa pleromatis White. 



This species is described and figured in vol. iv, Expl. and Sur. West 

 of the 100th Meridian, the types having been collected at Last Bluff, 

 Utah. It is not an uncommon species in the Wasatch Group in Utah r 

 Wyoming, and Colorado. An example found in White River Valley is 

 remarkably large, fully double the size of the type,. and the largest ex- 

 ample of the genus known to me. 



4. Goniobasis tenera Hall sp. 



In Fremont's Report on Oregon and North California, 1845, Professor 

 Hall described and figured Cerithium tenerum and C. nodulosum, both of 

 which, without doubt, belong to the genus Goniobasis, and both are doubt- 

 less of the same species. G. tenera being the first in order of description 

 in that report, that name is used as the x>roper name of the species. In 

 Proc. Acad. Nat. Sci. Philad. 1860, Meek described a form from Wyo- 

 ming under the name of Melania simpsoni '•■; and in the Am. Jour. Conch. 

 1808, Conrad described another, from Wyoming, under the name of G. 

 carteri, both of which are other synonyms of G. tenera. In the An. Rep. 

 U. S. Geol. Sur. Terr, for 1870, Meek changed G. nodulosum Hall sp. to G. 

 nodidifera, because the former name was preoccupied by Lea for a recent 

 species. This was unnecessary, because both are other synonyms of 

 G. tenera. Several distinct species of Goniobasis are known to exist 

 in the Laramie Group, but so far as I am able to discern, only one 

 species of that genus has yet been collected from either of the three 

 great fresh water deposits of the west, namely, the Washakie, Green 

 River, and Bridger Groups. This species is subject to great inter-specific 

 variation, and is known to range through the greater part of the Wasatch 

 Group ; through the Green River Group ; and is believed to range well 

 up into the Bridger Group also. It has even a greater variation than is 

 indicated by the fact that it has already received three specific names, 

 because a variety which I collected at Tabor Mountain in Southern Wyo- 



