y6 MYRIAPODA 



Order III. Archipolypoda. 



The most numerous of the fossil families. With a few 

 exceptions, all the Palaeozoic (that is, the oldest) ilyriapods belong 

 to this Order. The Carboniferous Archipolypoda seem to be 

 much more numerous in the coal of America than in that of 

 England. They resemble for the most part the Jlyriapods of 

 the present day, except that all the segments without exception 

 bear legs. 



The families are three in numljer. 



Family 1. Archidesmidae. 



Resemble the Polydesmidae of the present day. Two species have been 

 found by Page in the Old Red Sandstone of Forfarshire. He named them 

 Kampecaris. One found by Peach in the same formation is called Archi- 

 desmus. 



Family 2. Euphoheriidae. 



Tliey show some resemblance to the Julidae of the present day, but the 

 dorsal scutes, or plates of the back, are more or less perfectly divided into 

 two divisions corresponding with the pairs of legs. The following are the 

 principal fossils of this family : — 



Acantherpesles. Found by Meek and Worth in the coal at ilazon Creek 



in America (Fig. 46). 

 Euplioheria. About 12 species found at the same place as the last 



named. 

 Amylispes. Found by Scudder, jMazon Creek, America. 

 Eikticus. Scudder, Mazon Creek, America. 



Family .3. Archijulidae. 



The dorsal plates nearly consolidated, but the division still apparent. 

 Fossil forms are — 



TricJiijulus. Scudder, Mazon Creek, America. 



Xylohiiis. Dawson. Found in the coal in Nova Scotia. Two species 

 found at Mazon Creek, America. 



Order IV. Chilognatha. 



Families corresponding to those of the present day. The 

 oldest specimens come from the chalk in Greenland ; most of the 

 others from amber. 



Family 1. Glomeridae. One form, G. denticulata, has been found in 

 amber. 



Family 2. Polydesmidae. Two .species in amber. 



Family 3. Lysiopetalidae. A number of species, amongst which are 6 

 Graspedosoma, mostly from amber. 



