. Bulletin du Museum of Comparative Zoology de Harvard College. Zoologie Zoologie ;. 132 trois croisières de la " BLAKE. des océans, à la profondeur d'environ 2 000 brasses. Il est représenté par une seule espèce, uL. Wyvillei. Dans le Gulf Stream de l'Atlantique Nord et nous avons deux espèces d'Atolla, découvert par l' Albatros." Ils ne semblent pas se limiter à l'eau profonde, mais l'approche parfois la surface. Discophore n'a autant de segments sens comme Atolla ; et une caractéristique de la face orale de la cloche est le gros muscle trouvés sur les sous. Fig. 426.-Periphylla hyacinthina.

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 132 THREE CRUISES OF THE " BLAKE. oceans, at the depth of about 2, 000 fathoms. It is repre- sented by a single species, uL. Wyvillei. In the Gulf Stream and North Atlantic we have two species of Atolla, discovered by the " Albatross." They do not appear to be confined to deep water, but sometimes approach the surface. No discophore has as many sense segments as Atolla; and a marked feature of the oral surface of the bell is the large muscle found on the under. Fig. 426.—Periphylla hyacinthina. j. (Fewkes.) side of the corona. The ovaries of Atolla consist of eight kid- ney-shaped bodies arranged about a large and spacious stomach, which assumes the form of an inflated bag, opening into a recess in the walls of the corona, from which canals extend into the tentacles and sense-bodies. A. Bairdii is here figured. (Fig. 427.) Some of the most interesting medusse discovered by the " Blake " belong to the Siphonophorae. They are eminently pelagic in character, and wide-spread in their distribution. Pre- viously to the " Blake " expeditions we knew only a few genera of these beautiful animals from the American coasts. Although genera of siphonophores occur in some of the most northern localities visited in Arctic exploration, the home of the group is essentially in the warmer waters. This group seems to be most varied and rich in the West Indian area. Before 1880, . 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 work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum

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