. The British woodlice, being a monograph of the terrestrial isopod Crustacea occurring in the British Islands. Crustacea -- Great Britain; Oniscidae; Anthropoda; Invertebrates. 2 THE BRITISH WOODLICE. which has been named AvchiEoniscus brodiei, and is said to be referable to the recent family Aegidae is found in some numbers in the Purbeck Beds (Upper Jurassic), of this country (47). Fossil Isopods have also been recorded from the Oolite and from the Oligocene (Isle of Wight). Turning to the Woodlice proper, we find]that they first make their appearance in the Miocene (of Oenigen and Baden),
. The British woodlice, being a monograph of the terrestrial isopod Crustacea occurring in the British Islands. Crustacea -- Great Britain; Oniscidae; Anthropoda; Invertebrates. 2 THE BRITISH WOODLICE. which has been named AvchiEoniscus brodiei, and is said to be referable to the recent family Aegidae is found in some numbers in the Purbeck Beds (Upper Jurassic), of this country (47). Fossil Isopods have also been recorded from the Oolite and from the Oligocene (Isle of Wight). Turning to the Woodlice proper, we find]that they first make their appearance in the Miocene (of Oenigen and Baden), and occur also in amber (79); while examples of genera, such as Oniscus and Porcellio, have been discovered in late Tertiary deposits (47). External structure and appendages.—Woodlice agree Zaleral lo3e^~ eye —. HEAD (cepPicUcTT.) THORAX ZaUsral:;^^ ABDOMEN FIG. I.—PARTS OF THE BODY. (Oniicui asellus.) in being of a somewhat oval form, and their bodies are arched, the curve varying in different genera and species. A head is to be distinguished; behind this comes the thorax of seven segments which are often considerably broader than the six succeeding ones which form the abdomen (see fig. i.) The head carries two large antennae (fig. 3) which are very evident, and a careful search with a lens will reveal a second and minute pair (the smaller antennae) situated between the base of the others, and really anterior to them, (figs. 2 and 4.) The larger antennae are customarily bent at certain points, and we can distinguish a FIG. 2.—THE FIRST ANTENNA. {Oniscui aseliut.). 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 Webb, Wilfred Mark, 1868-; Sillem, Charles. London, Duckworth & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinverte, bookyear1906
