. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 408 bulletin: museum of comparative zoology. stage in the near neighborhood, as the Sarsia and Bougainvillea un- doubtedly did. And in the case of the Staurophora this is especially important, because this Medusa has often been classed as an Arctic form. As a matter of fact, however, the available data show that it is a constant inhabitant of the Gulf of Maine. On May 17th, several specimens about two inches in diameter were taken; and I have seen it adult in Massachusetts Bay at the beginning of June. Other
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 408 bulletin: museum of comparative zoology. stage in the near neighborhood, as the Sarsia and Bougainvillea un- doubtedly did. And in the case of the Staurophora this is especially important, because this Medusa has often been classed as an Arctic form. As a matter of fact, however, the available data show that it is a constant inhabitant of the Gulf of Maine. On May 17th, several specimens about two inches in diameter were taken; and I have seen it adult in Massachusetts Bay at the beginning of June. Other animals, the young of which occurred in notable numbers were crabs (Cancer) as noted above, and especially the common barnacle (Balanus). In the case of the latter, the whole reproductive period was covered by the hauls near Boon Island and the Isles of Shoals, for its eggs were taken in large numbers on March 29th and April 4th off Boon Island, the nauplii at the same locality April 5th. By the 9th, the nets yielded large numbers of the " Cypris" stage with a few nauplii, and by the 19th, Cyprids only were taken. These reached their maximum abundance April 25th to 30th, when they formed the bulk of the macroplankton, from which time onward they diminished, though they were constantly present in small numbers until the middle of May, when they had practically disappeared. The most interesting feature of the spring macroplankton, from the fisheries standpoint, was the sudden appearance of great swarms of the schizopod Thysanocssa raschii. A few specimens were taken in the nets on April 22, and on the 23d, when none chanced to be caught Mr. Welsh noted the " pollack schools feeding on shrimps which were also in dense schools," near the Isles of Shoals. On the 25th many were taken off Boon Island, and Mr. Welsh noted " the feed (shrimps) breaking water trying to get away from the pollack which are after them. The feed occurs in dense swarms, apparently 6 i
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