. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 320 bulletin: museum of comparative zoology. ware Bay (Station 10073), its range being slightly more extensive than that of Mnemiopsis leidyi (p. 322). Probably it was the Chesapeake current which carried it to the outer edge of the shelf off Chesapeake Bay. Aequorea groenlandica like Mnemiopsis was living chiefly at the surface and for a fathom or so down, the deeper hauls yielding very few even where many were seen floating past the ship. The range of salinity was from about (Station 10077) to about
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 320 bulletin: museum of comparative zoology. ware Bay (Station 10073), its range being slightly more extensive than that of Mnemiopsis leidyi (p. 322). Probably it was the Chesapeake current which carried it to the outer edge of the shelf off Chesapeake Bay. Aequorea groenlandica like Mnemiopsis was living chiefly at the surface and for a fathom or so down, the deeper hauls yielding very few even where many were seen floating past the ship. The range of salinity was from about (Station 10077) to about 34%a (Station 10076), the temperature from about 65° to about 77°. The boreal neritic species are Melicertum campanula, Staurophora mertensii, Mitrocoma cruciata, Tiaropsis diademata, Phialidium lan- guidum, and the northern form of Cyanea capillata. In July and August these are all confined to the waters east and north of Cape Cod, (Fig. 79) though they appear in winter in the sounds and bays, as far west as Narragansett Bay. The occurrence of Phialidium, and Stauro- phora has been commented on (p. 274), and I need merely add that the rarity of the others in the central part of the Gulf agrees with our experience in 1912 (1914a). Two important species, Mnemiopsis leidyi and Pleurobrachia pileus are intermediate between neritic and oceanic, for though neither has a fixed stage, and though Pleurobrachia occasionally occurs far from land, it is distinctly a creature of coast waters rather than of the open ocean (Kramp, 1913a, p. 532), while this is even more true of Mnemiop- sis. The range of Pleurobrachia extends unbroken from Labrador (1909c) at least as far south as Pamlico Sound (1913a, p. Ill) and per- haps farther. And we found it more generally distributed in the coast waters than any other coelenterate, swarming locally south as well as north of Cape Cod (Fig. 80). From the distributional standpoint, localities where a species does not occur may be fully as significant
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