摘要
杭州和普陀岛的陆生贝类共计２亚纲１０科１７属３１种，包括杭州２０种，普陀岛１６种，而两地兼有仅５种，说明岛屿与大陆的陆生贝类区系组成有差异．杭州的石灰岩区域比非石灰岩区域，陆生贝类种类多，每平方米生物量或密度也较高．蛛形环肋螺 Ｐｌｅｃｔｏｔｒｏｐｉｓ ａｒａｎｅａｔｅｌａ（Ｈｅｕｄｅ）（巴蜗牛科）是浙江新记录种．
It has been found out that there are 31 species of land shell belonging to 2 subclasses, 10 families, 17 genera in Hangzhou land and Putuo island of Zhejiang province,China. The fauna in both places are found different. Through vast investigations,it was found that the species,biomass and density of land shell notably increase on calcareous rock. A new record of Plactotropis areneate (Heude) in Zhejiang province is also reported.
