A. aculeata Gmelin ; Greenport, S. & P. 

 Ostrea borealis Lamarck ; common, all bays. 



FRESHWATER SPECIES. 



Campeloma decisa Say ; Riverhead, S. & P. 



Amnicola limosa Say (- A. porata) ; Riverhead, S. & P. 



Limnaea auricularia Linnaeus; lily ponds in Prospect Park, intro 



dnced. 



L. colnmella Say; all streams and ponds. 

 L. hnmilis Say ; Huntington, S. & P. 



L. desidiosa Say; Huntington, Flushing. 

 Physa heterostropha Say ; all streams. 



Aplexa hypnorum Linnaeus ; Huntington, rare, S. & P. 



Planorbis trivolvis Say; all ponds, abundant, even when water dries 



up for six weeks in summer. 

 P. bicarinatus Say; running streams, rare. 

 P. exacutus Say ; ponds at Jamaica. 

 P. dilatatus Gould ; Southold, rare, S. & P. 

 P. parvus Say; ponds and streams. 

 Segmentia armigera Say ; streams near Jamaica. 

 Ancylus fuscus Adams ; Flushing. 

 Ancylus - -; Flushing. 



Gundlachia stimpsoniana Smith ; Greenport, S. & P. 

 Sphaerium simile Say ; Flushing. 

 Calyculina partumeia Say (- Sphaerium) ; all ponds, even when 



water dries up for weeks. 

 C. securis Prime; Riverhead, S. & P. 

 Pisidium abditum Haldeman ; common, S. & P. 

 P. variabile Prime; Centerport, rare. S. & P. 

 P. splendidulum Sterki ; Long Island, Letson. 

 Unio complanatus Solander ; Riverhead, S. & P. 

 Anodonta implicata Say; lake in Prospect Park. 

 A. cataracta Say ; Flushing. 



LAND SHELLS. 



Pyramidula alternata Say ; Lloyd's Xeck, S. P. 



Helicodiscus lineatus Say ; Bayville. 



Polygyra albolabris Say ; Bayville. 



P. thyroides Say ; all woods. 



Helix nemoralis ; Flushing, introduced. 



Vallonia pulchella Miiller; in gardens everywhere. 



Strobilops labyrinthica Say; Staten Island; Greenport, S. & P. 



Zonitoides arboreus Say; all woods. 



Vitrea cellaria M tiller ; Brooklyn. 



Succinea avara Say; Huntington, rare, S. & P. 



S. obliqua Say ; north of Jamaica. 



S. -; Rockaway Park. 



TO 



