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 Jast hope seems to be the Hall material 
atthe University of Chicago, which has not been unpacked. 
The latitude given for the Mya, Nucula, Pleurotomaria, Cerithium 
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 Turbo and Cerithium paludinae- 
formis, which is given as Lat. 414, 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 Cytherea, 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 Nucula 
impressa Conrad, 1848, from the Tertiary of Oregon, which, as 
Dr. Dall informs me, is a Portlandia, and both are preoccupied 
by Nucula 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? occidentalis 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 occidentalis 
Meek and Hayden, 1856, from the Cretaceous of South Dakota, 
for which I propose the specific name dakotensis. 
oer? Y OED a 
