File:Image from page 335 of "A manual of zoology" (1900) (20155381764).jpg

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Title: A manual of zoology Identifier: cu31924031715752 Year: 1900 (1900s) Authors: Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925 Subjects: Publisher: New York, The Macmillan Company; London, Macmillan & Co. ,Ltd. Contributing Library: Cornell University Library Digitizing Sponsor: MSN


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Text Appearing Before Image: 3°6 MANUAL OF ZOOLOGY the terminal part of the intestine close to the anal aperture is the duct of a peculiar gland — the ink gland (Fig. 193, 1). This secretes a black substance, the ink, which is discharged when the animal is irritated or alarmed, and mingling with the water in the mantle-cavity is discharged as a dark cloud, under cover of which the animal may elude the pursuit of an enemy. The heart and vascular system reaches a high stage of development. The heart consists of a median ventricle and nejbh.ap

Text Appearing After Image: frtCLnt Fig. 191. —Nautilus pompilius, interior of mantle-cavity of a male specimen with the postero-ventral wall reflected, a. 1. neph. ap, oral left nephridial aperture: an, anus ; cten, ctenidia ; /. $ ap, left reproductive aperture ; /. ant. os, left oral osphradium ; / vise ap, left viscero-pericardial aperture ; mant, flaps of mantle : pen, penis; /. A neph. np, aboral left nephridial aperture ; /. r. neph. tip, aboral right nephridial aperture ; post, os, aboral osphradia ; ?-. vise, np, right viscero- pericardial aperture. two or four elongated lateral auricles or branchio-cardiac vessels conveying the blood from the ctenidia to the ventricle. The nervous system is highly developed, and its principal central parts, representing the cerebral, pedal, and visceral ganglia of other molluscs, with their commissures and con-


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Source Image from page 335 of "A manual of zoology" (1900)
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