Book Reviews of pagurid-actinian symbioses are described in detail. A. N. SASTRY'S paper deals with the ecology and development of pelagic larvae. Finally, B. C. COULL and S. S. BELL describe biotic assemblages, including populations and communities. Substrates and zooplankton are discussed, but this is a short section with less information than the others.
C'oE. 8 bridges the gap between those volumes dealing with the "functional machinery of crustaceans and those dealing with ecological, taxonomic, behavioral, and applied subjects". It examines the dynamic interaction between an organism and its external environment. The seven sections deal with different types of adaptations. First, F. J. VERNBERG describesrespiratory adaptation to abiotic and biotic factors. J. N. CAMERON &.C. P. bfANGIJB1, in their section on environmental adaptation of the respiratory system, discuss ventilation, circulation, and oxygen transport, including effects of ambient oxygen concentration, COz, pH, and adaptations to salinity. A complex recently stndied by many investigators of marine and freshwater species, concerns the feeding mechanisms, such as the filter feeding by planktonic crustaceans, sources of food, and feeding strategies. I n this section, J. GRAHAME points out the importance of distinguishing carefully between filtration and ingestion rates. Superfluous feeding has also been observed. This section shoa s particularly how quickly such reviews become obsolete: The list of references includes papers no later than 1979, and it already requires updating to remain current.-R. GILLES & A. PEQIJEUX describe environmental effects on chemical and osmotic regulations, mainly the direct and indirect influence of salinity. I n his contribution on ecological aspects of reproduction, A. N. SASTRS emphasizes that the immense variation in crustacean life history patterns and reproductive traits has obviously contributed to their evolutionary success, both in number of species and in habitats. Crustaceans have also successfully exploitated terrestrial habitats. L. W. POWERS & D. E. BLISS describe the terrestrial adaptions of rladocerans (chydorids in rain forests), ostracods (Yesocypris), copepods (harpacticoids in wet mosses), amphipods (only Gammaridea), isopods (the most successful1 group), and decapods (including the large Birgus latro). As a group, crustaceans are generally ill-equipped for life on land. There are adaptations t o reduce loss of water and for intake and storage of water. Finally, W. B. & F. J. VERNBERG describe freshwater