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, 1866-1944Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan companyLondon, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: W. H. C. P. 1 area, an ark. 2 /xirriXos, an edible mussel of the Greeks. THE FREtiH-WATER CLAM AND 77N ALLIED 185 familiar blue-black, wedge-shaped shells attached in clus-ters or beds to rocks near low tide (Fig. 17:2). They areedible. In France they are reared for the market onwoven nets, which are submerged at each tide. Text Appearing After Image: FIG. 172. — A bed of Modiola, the horse-mussel, ou a mud-bank. Photo, by W. H. C. P. The Aviculidael are a group closely allied to the last, butnot represented, on our shores. It is important becausemollusks of this family produce the best pearls. Pearl-lishing has been carried on since the earliest preservedhistoric records. The pearl banks of Ceylon are known 1 A small bird (acts). 186 ZOOLOGY to have been fished for two thousand years. The finestpearls come from the Persian Gulf. They are gatheredthere by native divers, who, after taking several deepinspirations, either dive down unaided or descend uponweighted ropes. When they can no longer remain underwater, they either ascend again unaided or are rapidlydrawn up to the boats above. The pearl oysters broughtup to the surface are then examined for pearls. The pearlis the secretion of the oyster about a small foreign body, such as a grain of sand.This secretion prevents theirritant from injuring thetissues. It is of the samenatur Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Summary[edit] Description: English: Modiolus modiolus, the northern horsemussel. Date: 29 May 2010. Source: Own work - photo made at an sea aquarium. Author: Georges Jansoone (JoJan).