Viewing page 52 of 62

This transcription has been completed. Contact us with corrections.

50

This paper comprises the first part of the report on the deep sea mollusca collected on the "Blake" expeditions and consists, 1[[superscript]]0[[/superscript]], of a general discussion of the conditions of molluscan life at various depths, the effect of these conditions upon variation and specific equilibrium, a classification of the regions of the sea bottom, and a review of the fauna of the depths as now known; 2[[superscript]]0[[/superscript]], of a description of the brachiopods and pelecypods of the "Blake" collection and illustrative species amounting to thirteen species and varieties of brachiopods and two hundred and fourteen of pelecypods (beside thirty mentioned or described as illustrative) comprising their new families, twelve new sub-genera or sections, and eighty-one new species, beside