Shells of Troy and Yicinity. 



23 



SYNOPSIS. 



Unio alatus, Say. 



" nasutus, Say. 



" complanatus, Ze«. 



" cariosus, /Say. 



" ochraceus, Say. 



" tappanianus, Xe«. 



" radiatus, Z«m. 



" pressus, Zea. 



Spileriem sulcatum, Zam. 

 " striatinum, Lam. 

 il securis, Prime. 



Paledesta integra, Say. 

 " decisa, Say. 



Valvata tricarinata, Say. 



UNIONISE. 



Margaritana rugosa, Lea. 



" undulata, Lea. 



" marginata, /6 V «2/. 

 Anodonta implicata, /Say. 



"• iluviatilis, Ze«. 



" lewisii, Lea. 



" benedictensis, Ze«. 



" edentula, /Say. 



CORBICULAD^. 



Pisidium virgmicum, Bourg. 

 " compressum, Prime. 



VIVIPARID^I. 



Paledesta rufa, Hold. 



VALVATID^. 



Leseslea elodes, /Sfe^/. 



" ampla, Mighels. 



var. catascopium 



" humilis, z&y. 



" reilexa, /Say. 



" desidiosa, Say. 



" umbilicata, Adams. 

 Phtsa heterostropha, /Say. 



" ancillaria, Say. 



LIMN^ID^:. 



Phtsa hypnorum, Linn. 



" bicarinatus, Say. 

 Planorbis trivolvis, Say. 

 " campanulatus, Say. 

 " exacutus, /Say. 

 " armigerus, Say. 



parvus, 



Gould. 



denectus, Say. 



Ancylus . 



Melania virginica, Gmel. 

 " elevata, Say. 



Somatogyrus integer, Say. 

 Amnicola limosa, Say. 



Seccestia ovalis, Say. 



" obliqua, Say. 



" totteniana, Z^a. 

 Helix exoleta, Binney. 



" fuliginosa, " 



" lineata, /Say. 



" monodon, Racket. 



" minuta, /(Say. 



" multidentata, Binn. 



" palliata, /Say. 



melaniad^;. 



Melania subularis ? Zea. 



AMNICOLIDJ3. 



Amnicola lustrica, /Say. 



HELICID^J. 



Helix albolabris, /Say. 



" alternata, /Say. 



" arborea, /Say. 



" concava, Say. 



" cbersina, /Say. 



" striatella, Anth. 



" tridentata, /Say. 



" thyroidus, /Say. 

 Yitresta limpida, Gould. 



