File:Image from page 231 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14781897091).jpg

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Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: FIG. 198. — Bougainvillea ramosa. A, entire colony, natural size; B, portionof the same magnified; C, immature medusa; dr. c, circular canal; cu,cuticle or perisarc; ent. ccw, enteric cavity; hyd, polyp or hydranth; hyp,hypostome or manubrium ; med, medusa; mnb, manubrium ; rad. c, radialcanal; t, tentacle; v, velum. From Parkers Biology, after Allman.This is closely allied to the New England B. super cllians. 212 ZOOLOGY from the parent, and the eggs develop in the bud. Instill other cases a mere bud, called gonophore, is formed,which becomes full of sexual products without ever ac-quiring resemblance to a jelly-fish. The jelly-fish is theprimitive type which has undergone a reduction in somecases to a gonophore. It is an interesting fact that incertain species sometimes jelly-fishes and sometimes gono-phores will be produced. In the Campanularidae the

Text Appearing After Image: FIG. 199. — Zygodactyla. Reduced. From a drawing by A. Agassiz. gonophores are encased in a cuticular capsule, but in the Tubularidse they are quite naked. There are certain hydromedusre in which the hydroidstage is unknown or known to be lacking. Here belongsome jelly-fishes of large size, like Zygodactyla, one of the Trachomedusse of our coast, which may become eight toten inches in diameter (Fig. 199). Besides these the seacontains many small species, which are easily captured inthe net, and which are of extreme beauty and delicacy. Besides the Hydromedusre, the group of Hydrozoa in-cludes the Siphonophora.1 These animals are alwayscolonial and free-swimming, and are among the most 1 0-/0WJ/, a siphon ; o/)6s, bearing. THE HYDRA AND ITS ALLIES 213 beautiful inhabitants of the sea. Those who have crossedthe Atlantic are acquainted with the Portuguese man-of- •fon.


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