IN THE AT~EMPT to advance our knowledge of the manne Mollusca of the Hawaiian Islands, groups provided with a shell have been among the first to receive attention. Largely for this reason gastropods of the order Prosobranchiata, having conspicuous shells, have become better known than have such forms as belong in the order Opisthobranchiata in which a shell is often absent in the adult.' Such n...

The Sydney octopus (Octopus tetricus) occurs in unusual numbers on a shell bed of its prey remains that have accumulated as an extended midden where additional octopuses excavate dens. Here, O tetricus are ecosystem engineers, organisms that modulate availability of resources to other species and to their own species by causing physical state changes in materials. A community of invertebrate gr...

A summary is given of the feeding habits of known predators on bivalve molluscs, including birds, fish, Pinnipedia, Mollusca, Arthropoda and Asterozoa. The fossil record of these groups, and of other possible extinct predators, is discussed in relation to the fossil record of the bivalves. It is concluded that asteroids are, and were, probably the most important of all predatory groups, and the...

1. The existence of malic enzyme (EC 1.1.1.40 1-malate: NADP oxidoreductase), has been discovered in the muscle extract from mollusca. A procedure for the preparation of purified enzyme is presented. 2. After extracting with potassium chloride solution, purification was carried out with fractional precipitation by ammonium sulphate, adsorption with calcium phosphate gel and fractionation by DEA...

A good many papers have been published in recent years leading to the conclusion that mammalian tissues can be viewed as composed of separate phases, corresponding approximately to cells and intercellular spaces, which differ in their inorganic composition. The technique has been to analyse the tissue as a whole and, by comparison with serum analyses, to calculate the space occupied by the cell...