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1. Detailed morphological data for H. truncata are given as a standard for comparing species of Hydrobia,worldwide stressing the importance of quantitative data, scaling and allometry. The need for careful examination of all organ systems is stressed. Useful data for comparing species have been derived, in order of importance, from the female reproductive system, male reproductive system including details of penial filament, appendages, glands; radula, mantle-pallial structures, head pigment patterns, shell allometry.2. Three populations of Hydrobia truncata from Maryland, New Jersey, and Massachusetts respectively were compared morphologically and ecologically with H. totteni and H. salsa of Massachusetts and Hydrobia from northern Europe. Three species of Hydrobia inhabit the same geographic region in Massachusetts.3. H. truncata differs from H. totteni morphologically and ecologically. Shell size and allometry separate the species, as well as differences in eight anatomical character states. However, t...

THE MORPHOLOGY OFHYDROBIA TRUNCATA(GASTROPODA: HYDROBIIDAE): RELEVANCE TO SYSTEMATICS OFHYDROBIA