PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 321 
Vol. VI, No. 21. 
Washingion, D. ©. Dee. 27, 1883. 
are modified so as to almost appear distinct. The demarcation between 
the molluscan fauna of Northern and Western Florida and that of the 
Keys is less distinct than has been supposed, but it is still sufficiently 
evident. 
LAND AND FRESH-WATER GASTROPODA. 
Veronicella floridana Binney. 
Sarasota Bay, a new locality for the species. Mr. Hemphill observes 
that when at rest it becomes of a broad, oval form, but is long and 
narrow when in motion; its color changes very little by immersion in 
alcohol. 
Helix (Mesodon) mobiliana Lea. 
Rare at Tampa. This is the genuine mobiliana, not the species long 
confounded with it by authors. Mr. Binney names it H. jejuna Say, 
and considers the two nearly or quite identical. 
Helix (Triodopsis) hopetonensis Shuttleworth. 
Four dead specimens were found by Mr. Hemphill at Fernandina, in 
April, 1883. Also at Cedar Keys, not rare. 
Helix (Polygyra) pustula Fer. 
Cedar Keys, not rare. 
Helix (Polygyra) septemvolva Say. 
Key West and Sarasota Key, plenty. Walls of Fort Marion (San 
Marco) and elsewhere at Saint Augustine, very abundant and variable. 
Mr. Hemphill sends series, showing wide variation in form, size, and 
color. and concludes that septemvolva, cereolus, and carpenteriana are 
possibly merely isolated terms in one really continuous specifie series. 
Helix (Polygyra) volvoxis Pow. 
Tampa and Saint Augustine, abundant. Identified by Mr. Binney. 
A variety of the preceding. 
Helix (Polygyra) carpenteriana Bland. 
Cedar Keys and Key West, abundant. Extremely variable in color 
and form, as well as size. 
Helix (Polygyra) avara Say. 
Jacksonville, not very common. 
Strobila labyrinthica Say. 
Rare at Sarasota Bay, a new locality for the species. 
° 
Pupa incana Binney. 
Key West, common. 
Leuchocheila rupicola Say. 
Tampa, not rare. Identified by Mr. Binney. 
Proc. Nat. Mus. 883——21 
