. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 HARRY M. MILLER, JR., AND FLORA E. NORTHUP. particular host. Before discussing this, the frequence and nature of the infestation with each of the five larvae found will be taken up. Two of them were present only infrequently and in low percentages, and may be dismissed with brief statements. Cercaria dipterocerca sp. nov. was found in only four specimens, three in August, 1924, and one in late July, 1925; and similarly, C. variglandis sp. nov. was found in one host in each of these f C. variglandis O C. q uijje tennis x
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 HARRY M. MILLER, JR., AND FLORA E. NORTHUP. particular host. Before discussing this, the frequence and nature of the infestation with each of the five larvae found will be taken up. Two of them were present only infrequently and in low percentages, and may be dismissed with brief statements. Cercaria dipterocerca sp. nov. was found in only four specimens, three in August, 1924, and one in late July, 1925; and similarly, C. variglandis sp. nov. was found in one host in each of these f C. variglandis O C. q uijje tennis x infestation nith all specie^. Auq Sept Oct /vor Dec Jan Fcb Mar Apr Mav June. Julv Aua TEXT-FIGURE i. Graphs showing seasonal fluctuation in total infestation of Nassa obsoleta, and infestation with each species of trematode. same collections, and once in August, 1925. There is no obvious explanation for the slight and infrequent occurrence of these two trematodes in Nassa obsoleta. It may be that they are normally parasitic in some other mollusk host, but are capable of developing occasionally in this species of Nassa; or the final hosts may be migratory. A third species, C. quissetensis sp. nov., was found in eight of the twelve collections, always in very few hosts, and never emerging after isolation of the snail. In the October collection the rediae were filled with mature cercariae; in November and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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