122 



THE NAUTILUS. 



Cerithium tenerus=Goniobasis tenera. 



Turbo paludinaeformis=Vivipara paludinaeformis. 



Turritella bilineata. 



Natica? occidentalis. 



Pleurotoma uniangulata. 



I have been unable to locate the types of any of these species. 

 They do not appear to be at Albany, New York, Washington 

 or Philadelphia. The last hope seems to be the Hall material 

 at the University of Chicago, which has not been unpacked. 

 The latitude given for the Mya, Nucida, Pleurotomnria, Cerithiutn 

 tenerum, and C. fremonti (Lat. 40), is incorrect, as they are 

 definitely reported to have come from where Fremont crossed 

 the mountains from Muddy River, which flows eastward to 

 Muddy Creek, which flows westward into Bear River. This- 

 would be in southwestern Wyoming, above Lat. 41, probably 

 not far from the locality of the Twrbo and Cerithium paludinae- 

 formis , which is given as Lat. 4H, instead of being 115 miles 

 to the southward, as stated by Hall. It is not certain that 

 these were all from the same formation or the same past locality. 

 The Cytherefi; Natica and Turritella are said to be from Lat. 43 

 N., Long. 115 W., which would place them in the Snake River 

 Valley of southwestern Idaho, in a region occupied by fresh- 

 water Tertiary Rocks, according to Dr. Stanton. 



Nucula impressa Hall is a Yoldia, and has priority over Nucida 

 impressa Conrad, 1848, from the Tertiary of Oregon, which, as 

 Dr. Dall informs me, is a Portiandia, and both are preoccupied 

 by Nucida impressa Sowerby (Min. Conch., V, 1825), a Cre- 

 taceous shell of Europe. Hall's species may be known at 

 Yoldia fremonti, and Conrad's species may be known as Yoldia 

 (Portlandia) astoriana. 



Natica f occidentals Hall, a "delicate shell," is said to be 

 based upon one "perfect specimen," the mouth of which is not 

 entire but shows that the lip was somewhat expanded, and 

 several casts. Hall was in doubt as to its systematic position, 

 and if the locality given is correct, it is probably not a naticoid 

 shell. However, the name has priority over Natica occidentalia 

 Meek and Hayden, 1856, from the Cretaceous of South Dakota, 

 for which I propose the specific name dakotensis. 



