Image from page 89 of “The royal natural history” (1893) – more Marine Life goodness curated by www.SardineRunPE.co.za
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Title: The royal natural history
Year: 1893 (1890s)
Authors: Lydekker, Richard, 1849-1915 Sclater, Philip Lutley, 1829-1913 Frostick, W. B., former owner. DSI Brooks, W. T., former owner. DSI
Subjects: Zoology Natural history
Publisher: London and New York : Frederick Warne & Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries
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Text Appearing Before Image:
dwith a periostracum, and ex-hibiting reddish wavy colourmarkings. The columella isthickened and furnished withone or more folds or plaits.They are found only in clearrunning streams of SouthAmerica. The curious pulmonateknown as Ampliibola some-what resembles a periwinklein form. It lives between tide-marks in brackish or saltwater, on mud-flats at themouths of rivers in NewZealand, and is used as foodby the natives. It is abundantin some places, and is a slug-gish creature, subsisting uponthe vegetable matter containedin the mud, large quantitiesof which it passes through thealimentary canal. ProfessorHutton says that it will livefor a week or ten days in freshwater, and more than a fort-night in salt water, withoutbeing exposed to the air. Thebreathing-orifice is situated onthe right side of the neck, andthe radula shows some affinity to that of Physa, The shell is solid, globular, witha short spire and an oval aperture. The animal is furnished with a thin hornysubspiral operculum.
Text Appearing After Image:
RAMSHOKN SNAIL [Pluilurbl The Hixd-Gilled Group,—Order Opisthobranchiata. The Opisthobranchs form the second of the three main divisions of thegastropods, and are all marine forms, having the sexes united in eaeli individual,and breathing chiefly by gills or branchiae. This character at once separates themfrom the Pulmonata, and the different positions of the branchiae, and their herma-phrodite nature, serve to distinguish them from the Prosobranchia, the third andlast main branch of the Gastropods. In the Opisthobranchs the branchial veins as GASTROPODS. 353 well as the auricle are placed behind the ventricle of the heart, but in theProsobranchs the branchial system is anterior to the heart. The majority of themolluscs included in this order are unprovided with a shell in the adult state;but there are some exceptions, such as the shell-bearing Pteropods, and many ofthe Tectibranchs. They are generally furnished with a pair of tentacles and labialpalpi, or an expansion of the skin l
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