76 THE NAUTILUS. 
evanescent in the outer teeth. The radula is 0°55 mill. long, 0°14 
wide, and so one tooth measures about 0:0045>0-0035 mill. 
This is so radical a difference from the Pupidz that our species can 
no longer be placed under that family. It comes nearest Punctum 
pygmeum Drap.,' the radula being of the same type, and also the 
jaw is of the same formation, being quite low and composed of dis- 
tinct plates. 
As to the generic name, Sphyradium Charp. 1837(—Columella 
West., Edentulina Cless., both 1876, teste Westerlund) must be 
used. 
An interesting analogue is “ Pupa” neozelanica Pfr., with much 
the same form of shell, which Mr. H. Suter, a few years ago, has 
shown to be no Pupa, but a Charopa. 
It may be added that the American form is absolutely identical 
with the palearctic, even showing the same wide range of variation. 
There is no need, then, to name it Sph. “edentulum simplex.” Just 
so, to mention it by the way, Punctum pygmeum Drap. is identical 
on both continents, and so it is equally useless to name it P. pygmaum 
minutissimum. 
LIST, WITH NOTES, OF LAND AND FRESH WATER SHELLS COLLECTED 
BY DR. WM. H. RUSH IN URUGUAY AND ARGENTINA. 
BY HENRY A. PILSBRY AND WILLIAM H. RUSH. 
In presenting this list of land and fresh water shells from Uru- 
guay and Argentina, perhaps it will be well to state precisely the 
localities at which collections were made, especially so from the 
Uruguay River, which region seems to have been omitted from the 
report of D’Orbigny. The U. 8. S. Yantie, to which the writer 
was attached, arrived at Montevideo, Uruguay, in January, 1892. 
The public park, El Prado, of the city proved to be the richest re- 
gion near by; the suburbs of the town were rich in Helix lactea, as, 
indeed, were many places in Uruguay and Argentina; several large 
tracts are preserved for the cultivation of them for the supply of the 
Italian markets. The Cerro, which is quite a prominent hill ona 
‘In the radula of one specimen of P. pygmxum r+-17 teeth were counted in 
a transverse row, r+16 in another, and 80 (78) rows were found. The laterals, 
except the last one or few, were bicuspid. (Conf. E. S. Morse, Pulmonifera 
of Maine, p. 27, pl. 8, fig. 71.), 
