DAVID L. BELDING, _Biologist_. INTRODUCTION. When money was first appropriated in 1905 for a three-year investigation of the life, habits and methods of culture of the clam, quahaug, oyster and scallop, provision was made for a survey of the present productive and nonproductive areas suitable for the cultivation of these four shellfish. The following report embodies the results of this survey. _A. Method of Work._--In making this survey two objects were in view, which permit the grouping of the work under two main heads:-- (1) A survey of the productive and nonproductive shellfish areas of the State was undertaken, showing by charts the location, extent and abundance of each of the four shellfish, as well as the biological conditions of the waters and soils of the areas along the entire coast which could be made more productive under proper cultural methods. Wherever possible, information as to the production of certain areas was obtained from the shellfishermen as a supplement to the survey work. (2) Statistical records of the four shellfish industries were formulated, showing their value and extent as regards (_a_) production, (_b_) capital invested, (_c_) men employed. Data for these records were obtained from town records, from market reports and from the dealers and shellfishermen, both by personal interviews and by tabulated forms of printed questions. Owing to the present chaotic condition of the shellfisheries, it has been impossible to obtain absolutely exact data. The statistics that have been obtained are to all purposes correct, and are the most exact figures ever published on the subject. _B. Value of the Survey._--Before any reform measures of practical value can be advanced, accurate and comprehensive knowledge of the present shellfish situation in Massachusetts is absolutely essential. Up to this time there have been only vague and inaccurate conjectures as to the value of the shellfisheries, and even the fisherman, outside his own district, has little knowledge of their extent and their economic possibilities. The consumer has far less knowledge. For the first time this problem of the Massachusetts shellfisheries has been approached from the point of view of the economic biologist. This survey is intended to present a concise yet detailed account of the present status of the shellfisheries of Massachusetts, and is therefore the first step towards the preservation of our shellfisheries by providing a workable basis for the restocking of the barren and unproductive areas. It is hoped that it will be of interest both to the fishermen and consumers.