THE LIFE-CYCLE OF THE DIGENETIC TREMATODE, PROCTOECES MACULATUS (LOOSS, 1901) ODHNER, 1911 [SYN. P. SUBTENUIS (LINTON, 1907) HANSON, 1950], AND DESCRIPTION OF CERCARIA ADRANOCERCA N. SP

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Abstract
Sexually mature worms from Mytilus edulis, taken in Massachusetts and Connecticut, are identified as Proctoeces maculatus Looss, 1901. The specimens are often sterile, which reflects the abnormal conditions of development in the molluscan host. Similar worms were reported by Freeman and Llewellyn (1958) from Scrobicularia plana taken in the Thames estuary, England, and identified as Proctoeces subtenuis (Linton, 1907). P. subtenuis is regarded as identical with P. maculatus. Evidence is presented to show that Cercaria milfordensis Uzmann, 1953 is the larval stage of P. maculatus The taxonomy of the species is discussed. C. adranocerca is described from Gemma gemma taken at Boothbay Harbor, Maine. It is not congeneric with P. maculatus, but is referred tentatively to the family Fellodistomidae.