. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 290 bulletin: museum of comparative zoology. in the hauls on George's Bank (Station 10059). It was also notably lacking in the Gulf Stream water (Stations 10064, 10071), except for a few specimens at Station 10076 abreast of Chesapeake Bay. Calanus appears to be uniformly rare, or absent, in the bays and sounds of the southern coast of New England in summer: but it swarms in Narragansett Bay in winter (Williams, 1906). Calanus was rare on the surface, even in the Gulf of Maine, except at Stations 10085, 10093
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 290 bulletin: museum of comparative zoology. in the hauls on George's Bank (Station 10059). It was also notably lacking in the Gulf Stream water (Stations 10064, 10071), except for a few specimens at Station 10076 abreast of Chesapeake Bay. Calanus appears to be uniformly rare, or absent, in the bays and sounds of the southern coast of New England in summer: but it swarms in Narragansett Bay in winter (Williams, 1906). Calanus was rare on the surface, even in the Gulf of Maine, except at Stations 10085, 10093, 10096, 10097, 10100, 10101, and immediately off Gloucester, July 8, where it swarmed at that level. Four of these stations were occupied in daylight, three after dark; which shows that its absence on the surface, in the regions where it swarms in deeper water, does not depend altogether on sunlight, though the latter may be one of the factors which confine it to deeper levels. And Calanus certainly did not come to the surface off Cape Cod during the night of August 5, for surface hauls taken at 2 , and at practically the same locality at 8 (Station 10086), yielded very few Calanus, although the deep haul caught thousands. Stations 10057, 10061, 10087, 10090, 10092, 10102, 10104 where hauls were taken at three levels, surface, intermediate, and deep, show that Calanus was not usually equally abundant at all depths, the yields of hauls at 15-20 fathoms being very much larger than those at 50-85 fathoms. The numbers of specimens per haul were far too large for counting; but the shallower catches were usually two to four times as large in bulk as the deep ones, a difference too great to be charged to the difference in mouth area between the four foot and the Helgoland nets. And this source of possible error was further checked by occasionally alternating the two nets. The only exceptions to this rule were Stations 10093, 10097, and 10100, all in the eastern half of the G
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