46 THE NAUTILUS. 
ferred to Columbella avara Say, in this journal for May, 1897, as 
a new species, C. brasiliana (Archiv fiir Naturg., vol. 63, p. 171). 
The only difference he notes between this and the avara is that the 
intervals between ribs are smooth, not spirally striated. In the ser- 
ies of C. avara from Florida examined by me, this supposed distine- 
tion proves to be invalid, some of them being quite as smooth as the 
South American shells, At most, C. brasiliana is only a variety. 
In the same paper, the Columbella misera Duclos (not Sowb.) is re- 
named C. japonica.—H. A. P. 
Notes on UrvuGuay anp ARGENTINE FRESH-WATER SHELLS 
supplemental to the list in Nauritts, X, pp. 76-81. 
Amalia gagates Drap. Maldonado, Uruguay. 
Chilina Rushii Pilsbry. The largest specimen collected measures : 
alt. 223, diam. 153 mm.; alt. of aperture 16 mm. 
Limnea columella Say. Maldonado, Uruguay. 
The specimens seem to be the northern species; and if I am right 
in the identification it is probably a form introduced by man. No 
similar Limnea is known to me from South America. L. columella 
occurs as far south as Florida. 
Ancylus obliquus B. & S., was collected also at San Carlos R 
Uruguay. 
The Spherium and Pisidivm mentioned on p. 80 are as follows: 
Spherium argentinum @Orb. Creek in the Prado, Montevideo. 
Mr. E. R. Sykes of London has, with his accustomed good nature, 
compared specimens collected by Dr. Rush with the types in B. M. 
He writes: “ There is only one valve of Cyclas argentina, some- 
what damaged, in the Museum, with which, as far as one can judge 
from such a wreck, your shell is identical.” 
Pisidium Sterkianum Pilsbry. Same locality. 
Pisidium vile Pilsbry. Same locality. 
Requesting Mr. E. R. Sykes to compare these with Orbigny’s 
type of P. pulchellum, he wrote “ These are no specimens of Cyclas 
pulchella in the Museum and none were presented by d’Orbigny, as 
you will see by Gray’s Catalogue. I am, therefore unable to com- 
pare these.” 
Glabaris latomarginatus Lea and G. tenebricosus Lea were picked 
up at Buenos Ayres, dead valves only.—H. A. P. 
a) 
Nore on Hauisrytus. This group was founded by Dall to 
contain a small, pillar-shaped shell, H.coluwmna, from the east coast 
