. Seaside studies in natural history. Marine animals. SARSIA. 69 Fig 91. boscis, hanging from the under surface of the disk to a consider- able "distance below its margin. The four tentacles are of an immense length when compared to the size of the animal. As a general thing, the tentacles are less numerous in the Tubularian Medusae than in those arising from other Hydroids; they want also the singular limestone concretions found at the base of the tentacles in the Campanularian Medu- sae. In Fig. 91 we have one of the Tubularian Medusae {Twrris veaicaria A. Ag.) which has a rather larger
. Seaside studies in natural history. Marine animals. SARSIA. 69 Fig 91. boscis, hanging from the under surface of the disk to a consider- able "distance below its margin. The four tentacles are of an immense length when compared to the size of the animal. As a general thing, the tentacles are less numerous in the Tubularian Medusae than in those arising from other Hydroids; they want also the singular limestone concretions found at the base of the tentacles in the Campanularian Medu- sae. In Fig. 91 we have one of the Tubularian Medusae {Twrris veaicaria A. Ag.) which has a rather larger number of tentacles than is usual among these Jelly-fishes. We never find the tentacles multiplying almost indefinitely in them, as in Zygodac- tyla and Eucope. The little Jelly-fish described above is known as Sarsia, while its Hydroid is called Coryne. These names, having been given to the separate phases of its existence . before their connection was understood, and when' they were supposed to rep- resent two distinct animals. They are especially interesting with reference to the history of Hydroids in general, because they were among the first of these animals in whom the true relation between the difierent phases of their exist- ence was discovered. Lesson named the Sarsia after the great Norwegian naturalist, Sars, to whom we owe so large a part of what is at present known respecting this curious subject of alter- nate (BougainviUia supercUiaris Ac) The BougainviUia (Fig. 92), is one of our most common Jelly-fishes, frequenting our wharves as well as our searshore during the spring. The tentacles are arranged in four bunches Fig. 91. Tarris vesicaria; natural 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 Agassiz, Elizabeth Cabot Cary, 1822-1907; Agassiz, Alexander, 1835-1910, jo
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