FROM THE CARBONIFEROUS FORMATION. 149 



The great size of these lateral marks struck me, at the time my paper was written, as 

 inconsistent with their reference to the foramina repugnatoria, but there did not then 

 seem to be anything else to which they could be compared. A re-examination of a few 

 specimens of the sigillarian myriapods in my possession, coupled with the statements of 

 Woodward and Dohrn, lead me now to the conclusion that these marks are the scars or 

 bases of spines, which appear as warts or tubercles in man}' of the Mazon Creek myria- 

 pods, or, in casts or views of the interior surface, as pits of greater or less dimensions. 

 Their position would entirely accord with this. Add to this the fact that all of these 

 Iulid-like carboniferous myriapods had a decidedly fusiform body (some more than others) 

 tapering somewhat toward the head and a great deal toward the tail ; and that the legs 

 where preserved are of unusual length — both of these features peculiar to the spined 

 myriapods of the Mazon Creek nodules : and I think we may fairly consider it probable 

 that they too possessed some at least of the other features characteristic of the latter, and 

 should be hypothetically classed, until proof to the contrary is found, among the Archipo- 

 lypoda. 



In this paper however no further attention will be paid to these smaller Iulidiform 

 types, which were not improbably wholly terrestrial in habit, and may very likely have 

 formed a distinct family of Archipolypoda, to which I have already applied the term 

 Archiulidae, and which, in addition to the characteristics mentioned in the paper upon 

 them, were not improbably distinguished from the Mazon Creek myriapods, to which the 

 family name of Euphoberidae may be given, in the absence of branchiae. 



It only remains, before proceeding to the discussion of different forms of Euphoberidae, 

 to point out that we have in these Archipolypoda still another proof of the close alliance 

 of the fauna of Europe and America in paleozoic times. The genera Xylobius, Acanther- 

 pestes and Euphoberia, including ten of the twelve species of myriapods found in American 

 carboniferous rocks are all represented in the coal measures of England. I shall be able 

 in future papers, from material already in my hands, to point out among other insects addi- 

 tional evidence of great interest in this direction, and shall hope at no distant day to offer 

 lists of the carboniferous insect faunas of Europe and America in parallel columns, so as to 

 bring clearly to the eye this prominent feature of early insect life. 



The number of forms of Archipolypoda represented in the carboniferous rocks has 

 proved unexpectedly great. By the kindness of several friends, mostly residents of 

 Morris, from whence the ironstone nodules, in which most of them were found, come, I 

 have been able to study twenty-six specimens, which with the eight previously known 

 belong to twelve distinct species and four different genera. The genera are distinguished 

 in part by the form of the segments, and in part by their armature ; Acantherpestes having 

 three rows, Euphoberia two rows, and Amynilyspes one row of spines on either side of the 

 body, while in Eileticus, spines are absent and their place supplied by a series of warts. 

 Euphoberia is far the most abundant in species, Acantherpestes having only two, and 

 Amynilyspes and Eileticus one each. 



