Page 4 September 1979 No. 254 NEW YORK SHELL CLUB NOTSS 
A NOTE ON THE DISTRIBUTION OF DRYMAEUS MULTILINEATUS (Say, 1825) 
IN EASTERN FLORIDA 
Morris K. Jacobson 
; ; 274 i tty lit- 
The Lined Tree Snail, Drymaeus multilineatus, 15 4 very prett 
tle snail, about Pag’ anch Wiel and less than one-half inch wide. It 
is opaque ivory in color with numerous unequal, obliquely axial, 
Ciiwh serine: The sutures likewise have a variously wide agate 
line. (See Emerson and Jacobson, AMNH Guide to Shells, 1976: p. 34) 
It is said to be a useful snail, since it lives on small fungi harn- 
ful to fruit and other trees. 
Its range in Florida is mainly in the south: the Florida Keys up to 
Arch renin. about 12 miles north of Miami (Pilsbry, 1946:27)*. On 
the west coast its range is also mainly southerly, mostly in Collier 
County. But there is a report of a much more northerly colony in 
Manatee County in central Florida. Of any colonies found north of 
Collier County, Pilsbry (ibid.) writes that such colonies are "owing 
to transport by human agency, Indian or later." 
A similarly isolated colony was found recently at Indialantic, Bre- 
vard County, on the east coast, by Terry Hillman, on September 24, 
1978. Whether its presence is also due to human transport is un- 
known, but, for several reasons, not very likely. On a recent visit 
to the site (May 8, 1979), two members of the Astronaut Trail Shell 
Club (Eleanor Hillman and Karl Jacobson) found several live, mature 
specimens on an oleander bush just east of Route A1A. Hence it is 
clear that the colony successfully wintered over. Two specimens 
were collected to be deposited in some museum as "voucher™ specimens. 
The others were merely recorded. 
it can now be said that Drymaeus multilineatus has at least one col- 
ony as far north on the east coast as Brevard County. Whether this 
can be considered as an extension of range, i.e. whether other col- 
onies can be found between Indialantic and Miami, remains to be seen. 
*Pilsbry, H. A., Land Mollusca of North America, 1946, Vol. 1, 
Ue 20 Its 
(The above report appeared also in the newsletter of the Astronaut 
Trail Shell Club, spring, 1979.) 

MALACOLOGICAL ARTICLE OF THE MONTH 
Re: Polinices duplicatus 
"Feeding and growth rates of Polinices duplicatus preying on Mya 
arenaria at Barnstable Harbor, Massachusetts" is the subject of 
D. Craig Edwards and Judith D. Huebner's paper in Ecology 58: 1218- 
1236, Autumn 1977. The factors chiefly affecting rates were food 
Supply, temperature, predator size or weight, and recent feeding 
experience. It was found that feeding varied directly with temper- 
ature, peaking at 0.6 Mya per snail per day in the warmest months 
but ceasing (at approximately 41°F) for four months in winter. 
Henry D. Russell 
