. The Cambridge natural history. Zoology. 74 MYRIAPODA In the secondary period the Myriapods were scantily repre- sented, or, at any rate, geologists have failed to find their fossils. The class is represented by a single specimen found in the chalk in Greenland. This fossil, which has been included in the Julidae under the name of Julofsis cretacea, may perhaps belong to the Archipolypoda. Passing on to the Tertiary or Eecent period, we find the Myriapods again numerous, and more nearly resembling those living at the present time. They belong mostly to the Chilo- gnatha and Chilopoda. They ha
. The Cambridge natural history. Zoology. 74 MYRIAPODA In the secondary period the Myriapods were scantily repre- sented, or, at any rate, geologists have failed to find their fossils. The class is represented by a single specimen found in the chalk in Greenland. This fossil, which has been included in the Julidae under the name of Julofsis cretacea, may perhaps belong to the Archipolypoda. Passing on to the Tertiary or Eecent period, we find the Myriapods again numerous, and more nearly resembling those living at the present time. They belong mostly to the Chilo- gnatha and Chilopoda. They have been found in the fresh-water gypsum of Provence in Prance, the brown coal of CJermany, and the green river formations of America. Several have been found in amber. Possil Myriapods have been divided into four Orders, two. Fig. 46. —Acan- therpestesmajor. (After Meel; and Worth.) Mazon Creek, America, A, The whole animal ; B, branchiae on the ventral sur- face. of which coincide with the Orders of living Myriapods; the differences between the fossils and the living Myriapods ha^•ing been held insufficient to warrant the establishment of a new Order. These two Orders are the Chilopoda and the Diplopoda or Chilognatha (Diplopoda is another name used by some writers for the group which we have hitherto called Chilognatha). The other two Orders have sufficient differences from living forms to render it necessary to include them in separate Orders. The fossil Myriapods, then, are arranged as follows:— Order I. Protosyngnatha. Order II. Chilopoda. Order III. Archipolypoda. Order lY. Chilognatha (or Diplopoda). The following taljle will show the species that have laeen dis- covered in the different strata :—. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed;
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