. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. HrBOCODON PROLIFEn, Ag. St*m of a single Hydra. —o Its moutk sur- rounded with tentacles. — 11 Its marginal tentacles. — ddd The most advanced of its Medusas Medusa bud of Hybocodon trolifer, Ag. t Base of attachment to the Hydra stock. — o Proboscis. — c Circular chymife- rous tube. — b Kadiating chymiferous tube. — d t Proliferous Medusa with its single tentacle. — t Single tentacle of the primary Medusa. — Near c An- other small proliferous Meduaa-bud, and
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. HrBOCODON PROLIFEn, Ag. St*m of a single Hydra. —o Its moutk sur- rounded with tentacles. — 11 Its marginal tentacles. — ddd The most advanced of its Medusas Medusa bud of Hybocodon trolifer, Ag. t Base of attachment to the Hydra stock. — o Proboscis. — c Circular chymife- rous tube. — b Kadiating chymiferous tube. — d t Proliferous Medusa with its single tentacle. — t Single tentacle of the primary Medusa. — Near c An- other small proliferous Meduaa-bud, and several others upon the main radi- ating tube of the proliferous Medusa d ?, between the letters d and t ; ex- hibiting a striking analogy to Siphono- phora^. Free Medusa of Hybocodon prolifer, Ag. Tlie largest vertical tube being seen in profile. At first sight this Medusa resembles much the Steeu- strappia of Forbes; yet it differs ge- nerically. t' Proboscis.— r o Radiating tubes.— s Circular tube.— t Tentacle.—m Buds of Medusjc, proliferous from the base of the single tentacle. Free Medusa of Hybocodon prolifek, Ag. Facing the largest chymiferons tube, from the lower end of which hangs tlie single tentacle, with many small proliferous Medusas buds. a Point of attachment before its separa- tion from the Hydra stock.— be Radi- ating or vertical chymiferous tubes, c pointing to the circular tube. — t Ten- tacle. —f Bunch of proliferous Medusae buds. — e Rows of epithelial cells form- ing distinct bands at the surface. — o Proboscis. Medusa? buds produce new Hydroids without freeing themselves; and yet these Medusae buds sliow all the characteristic features of genuine naked-eyed Meduste. In Tulndaria proper, for instance (Vol. 4, PI. XXIY. and XXVI., figs. 3 and 4), they have four radiating tubes with a pendent proboscis and a circular tube, but hardly a trace of tentacles; while in other genera these characters are variously. Please note t
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