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

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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. 10(!. — Obelia (?), a group of campanularian hydroid colonies. Nat. size. Photo, by W. H. C. P. Another common kind is Sertularia,1 which forms rustybrown threads (Fig. 197 ). All the hydranths of one stem occur in one plane andoppositely. Both t u 1) 111 a r i a 11 andc a m p a 11 u 1 a r i a 11 hy droidsmay give rise to jelly-fishes.These jelly-fishes are formedas buds on the hydrant]i, andafter they become able to move of themselves they are;. 1 nat, size. cut off from the parent and 1 Derived from serta, garland. Text Appearing After Image: THE HYDRA AND J7N ALLIES 211 swim away. The jelly-fishes then give rise to the sexualproducts and discharge them into the water (Fig. 198).In other cases the jelly-fish is formed but never separated
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