. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BIGELOW: EXPLORATIONS OF THE COAST WATERS. 325 numbers of the spirally coiled Chactoceras debile intermingled with the long rod-like Thalassioihrix longissima, and an occasional Coscino- disciis. But both Thalassiosira and Chactoceras debile were lacking in the central part of the Gulf, being replaced there by other species of Chaetoceras, especially C. densum and C. borealc, while the diatom component of the mixed plankton in the eastern side of the Gulf was chiefly Rhizosolenia semispiiia and Chaetoceras. By the mid
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BIGELOW: EXPLORATIONS OF THE COAST WATERS. 325 numbers of the spirally coiled Chactoceras debile intermingled with the long rod-like Thalassioihrix longissima, and an occasional Coscino- disciis. But both Thalassiosira and Chactoceras debile were lacking in the central part of the Gulf, being replaced there by other species of Chaetoceras, especially C. densum and C. borealc, while the diatom component of the mixed plankton in the eastern side of the Gulf was chiefly Rhizosolenia semispiiia and Chaetoceras. By the middle of. Fig. 98.— Microplankton types, May 1915. 5, Diatom 3, Ceratium 4, Mixed diatom and Ceratium offshore limit to Thalassiosira June (Fig. 99) pure diatom plankton had dwindled to a small area off Mt. Desert (Station 10285), i. e. was no more extensive than in the preceding August (p. 322, Fig. 97). Diatoms had now practically disappeared from the southwestern and central parts of the Gulf (Stations 10298, 10299), where they had constituted-the bulk of the plankton a month earlier, while Thalassiosira gravida, T. norden-. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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