Carnegie Institution of Washington Publication Volume 109, PT. 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...and we may avoid confusion by considering it obsolete. GENERIC CHARACTERS. Margelinae with 4 or more simple, unbranched oral tentacles and with 8 or more simple marginal tentacles. When present the peduncle of the manubrium is simple, solid, and gelatinous. The hydroid stock is Podocoryne. Haeckel, 1879, restricts the genus "Dysmorphosa" to include only those medusae which have 8 marginal tentacles. Medusae bearing more than 8 tentacles he places in a new genus "Cytaandra." Inasmuch as specimens of Podocoryne fulgurans and P. carnea are often found which have more than 8 tentacles, we consider Haeckel's definitions to be too restrictive. Vanhoffen, 1891, defines Dysmorphosa, as we do Podocoryne, to include medusa, with 8 or more marginal tentacles. Podocoryne may be distinguished fromLymnorea by its simple unbranched oral tentacles. In Turritopsis there are no oral tentacles, but only 4 simple lips studded with nematocystknobs, and the presence of simple oral tentacles in Podocoryne at once distinguishes it from Turritops1s. It is distinguished from Cytce1s by its having eight or more marginal tentacles, whereas Cytceis is restricted to medusae bearing 4 marginal tentacles. In Cytceis the oral tentacles are commonly more than 4, whereas there are only 3 known species of Dysmorphosa bearing more than 4 oral tentacles. Podocoryne is possibly derived from the more simply organized Cytceis. Podocoryne carnea Sars. Plate 14, figs, 2 to 6; piate 15, fig. 14. Synonyms Of The European Form. (?) Dysmorphosa conchicola, Ph1l1pp1, 1842, Archiv. fur Naturgesch., Jahrg. 8, Bd. 1, p. 37, taf. 1, fig. 3. Podocoryne carnea, Sars, 1846, Fauna Littor. Norveg., p. 4, taf. 1, figs. 7-18.--Krohn, 1851, Archiv. fiir Naturgesch., Jahrg. 17, Bd. 1, p. 266.--H1n...