File:Image from page 135 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14784999855).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: xillae seen on each side ofthe abdomen. Embryo 10-18 daysold. X 25. From Herrick. female now moults, 1mt does not spawn again for a wholeyear ; that is, she spawns in alternate years. The numberof eggs carried varies with the age of the female; middle-aged lobsters may carry up to one hundred thousand eggs,but the old or young ones as few as three thousand. Theegg as freshly laid is about 1.5 millimetres in diameter andis stored with food material, called yolk, much as in thecase of the hens egg. As in the chick, the development 116 ZOOLOGY takes place, as it were, on top of the egg (Figs. Ill, 112).Eyes and mouth appendages early make their appearance;then the other appendages, and the tail (Fig. 113). Fora long time the back of the thorax is greatly distended bythe yolk stored there, and the eyes are huge (Fig. 114). Immediately after hatching, the young lobster is aboutone-third of an inch long. The eyes are still abnormallylarge, the telson is spatulate, and the abdomen is without

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Source Image from page 135 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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