对北海沿岸南澫、高德港、大冠沙三个不同底质的海滩进行调查，在退潮后沿海岸线收集贝类标本，经鉴定得到的标本隶属2纲9目36科67属79种。其中腹足纲29种，双壳纲50种.在南澫分布有8目20科31属31种；高德港有7目19科28属31种；大冠沙有9目21科38属38种.北海贝类分布属于印度—西太平洋区区系，以东海和南海热带亚热带暖水种为主要分布种；北海海滩的四种生境类型中种的相似性分析结果为极不相似，q值最大为0.1833，最小为0，两群落极不相似.在本次调查中彩虹昌螺和密纹泡螺为本海域新记录种.% An investigation was carried out on three beaches of different bottom quality, namely Nanwan, Gaodegang and Daguansha. Shellfish specimens were collected along the coastline at low tide. After identification, these specimens were sorted into 2 classes, 9 orders, 36 families, 67genera and 79 species. Among them, there are 29 species belonging to Gastropoda and 50 to Bivalvia. There are 8 orders, 20 families, 31 genera and 31 species in Nanwan;7 orders, 19 families, 28 genera and 31 species in Gaodegang;9 orders, 21 families, 38 genera 38 species in Daguansha. The shellfishes found in Beihai belong to the India-western Pacific fauna. Tropical and subtropical species in East and South China Sea warm water are the dominant species;the similarity of species analysis result of the four habitat types in Beihai indicates great difference. Maximum of q value is 0.1833, and the minimum of it is 0. There is almost no similarity between the two communities. In this investigation, the Umbonium vestiarium and Cantharus erythrostomus is the new species collected in this seas.
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