. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. Chap. II. MORPHOLOGY AND NOMENCLATURE. 85 are respectively the male and female Medu,sa3; and l)uds of both sexes arise from one and the same Hydra, the so-called gonoblastidinm. In Physophoridte also, the community begins with a single Hydra. Leuckart (Zoologische Untersuchungen, I. PI. 2, Fig. 23), Kolliker (Schwimmpolypen von Messina, PL II. Fig. 11), Vogt (Siphonophores de la mer de Nice, PI. VI. Fig. 24; PI. X. Fig^. 32 and 35; and PL XI.), Gegenbauer (Beitrlige
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. Chap. II. MORPHOLOGY AND NOMENCLATURE. 85 are respectively the male and female Medu,sa3; and l)uds of both sexes arise from one and the same Hydra, the so-called gonoblastidinm. In Physophoridte also, the community begins with a single Hydra. Leuckart (Zoologische Untersuchungen, I. PI. 2, Fig. 23), Kolliker (Schwimmpolypen von Messina, PL II. Fig. 11), Vogt (Siphonophores de la mer de Nice, PI. VI. Fig. 24; PI. X. Fig^. 32 and 35; and PL XI.), Gegenbauer (Beitrlige, etc., in Zeitsch. f wiss. Zool. vol. 5, PL XVII. Figs. 7, 8, 9, and 11), and Huxley (Oceanic Hydrozoa, PL VI. Fig. 12, and PL VIII. Fig. 2), have descrilaed and figured many such young Physophorida?, exhibiting the primary Hydr;\) of different genera more or less free from the secondary productions budding from their sides. In the youngest of them the Hydra character is ((uite plain, and their resemblance to the }'oung Physalia most striking {Fig. 50). But their resemblance to the Ilydroid of Nemopsis Giljliesii McCradg is still more important, since it shows, beyond the possibility of a doul)t, the close affinity of the naked-eyed Meduste and the Siphonophora^'. Thus far, all the Medusa3 known as originating from Hydroids had Ijeen vorxu rinsoriroi:.\, observed to bud from Hydroids attached by their basis; but, (Copua from Gegmbau,,-.) f Uuiis of so-called swLnimiug-bells. in a recent paper (Gymnophthalmata of Charleston harbor, -6 6 so-caiied tentacles; lower i, so-called Polyp.—cc Feelers with published in tlie Proceedings of the Elliott Society of Nat. Air 6, and /•, the primary Hydra; Hist, for 1858), Mr. McCrady has described a species of Ne- «and 6 secondary nydra;; f the Medusa; bud5. mopsis, which originates from a floating, locomotive Hydroid, so similar to a 3"0ung Phj-sophora with incipient buds of swimming-l^ells, that, had he
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