The British Woodlice

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Wilfred Mark Webb. The British Woodlice

The British Woodlice

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PREFACE

THE BRITISH WOODLICE

Отрывок из книги

Wilfred Mark Webb, Charles Sillem

Being a Monograph of the Terrestrial Isopod Crustacea Occurring in the British Islands

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There are four pairs of mouth appendages—namely the jaws or mandibles (fig. 5), the first maxillae (fig. 6), the second maxilla (fig. 7), and the maxillipeds (fig. 8). When the head is examined from the underside the last of these organs will be seen first, covering in the others.

A small median plate attached to the front of the head has been called "the upper lip" (fig. 9), while inside the mouth appendages is a little bilobed structure "the lower lip" (fig. 10).

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