24 THE NAUTILUS. 
our small ponds, adhering to sticks, pieces of boards, bark, leaves, 
and often may be found clinging to water plants and grass at or near 
the surface of the water; also found in beds of moss associated with 
Planorbis parvus. 
100.— Planorbis (Gyraulus) parvus Say. 
Shell small, discoidal, horn color to very dark brown, both sides 
concave, whorls four, crossed by minute wrinkles, body generally 
subearinate on the margin, aperture rounded, lip rounded and sharp, 
bluish white within. Said to be common throughout all eastern 
North America. It is common here in ponds, small sloughs and 
ditches, found clinging or adhering to sticks, bark and moss ; almost 
always associated with Physa gyrina and Planorbis exacutus. 
(To be continued.) 
PUBLICATIONS RECEIVED. 
ANNOTATED CATALOGUE OF THE Moxtiusca oF Iowa, by Chas. 
R. Keyes. This list contains 151 species ascertained by the 
author to inhabit Iowa. 
Moxuusca oF Easrern Iowa, by Prof. B. Shimek. This list, 
together with that of Mr. Keyes, contains probably nearly every 
species of mollusk to be found in Iowa. Mr. Shimek’s cata- 
logue enumerates 169 species, nearly all, I believe, collected by 
the author himself. 
ConrTRiputions TO THE Mo iusca oF Froripa, by Charles T. 
Simpson. The results of several years of collecting and of 
eareful study of the shells of Florida are given in this list. 
The author having resided for several years upon the South- 
west coast of Florida, and collected in nearly all parts of the 
State, has accumulated a collection of Floridan species which ~ 
includes a large number of forms not previously known to 
inhabit the State. 
The following species are described as new: Pleurotoma (Man- 
gilia) Simpsoni Dall, Tralia (Alexia?) minuseula Dall, Pandora 
buschiana Dall, Natica fordiana Simpson. 
NEW AND LITTLE-KNOWN AMERICAN Mon.usks, by Henry A. 
Pilsbry (from Proc. Acad. Sci. Phila. 1889). In this paper the 
following species are described as new: Holospira elizabeth (Mexico), 
Zonites singleyanus (Texas), Pecilozonites reinianus var. gooder 
(Bermuda), Bythinella cquicostata (Florida), Amnicola peracuta 
(Texas), and Spherium singleyi (Texas). Microphysa hypolepta 
Shutt., Zonites dallianus Simpson, Hydrobia monroensis Ffld. are 
re-defined. The genitalia of Pwcilozonites are described, etc., ete. 
All of the species are illustrated. 
