REMAINS IN THE CQAL-FORMATION OE NOYA SCOTIA. 
649 
(Received April 10, 1882.) 
I have much pleasure in appending the following note, which I consider a most 
important addition to my paper, showing that two species of Scorpions have been 
entombed with the other tenants of the erect trees. 
Note II.—-On Additional Remains of Articulates obtained by Hr- Dawson from 
Sigillarian Stumps in the Coal-field of Nova Scotia A By Dr. Samuel H. Scudder. 
The fragments sent to me for study, like those formerly received, consist in great 
part of myriapodal remains, often of single segments, and generally in a more or less 
crushed and flattened condition. In this respect they are not so well preserved as 
some of those previously studied, and obtained from erect trees in the same locality. 
Although all the species formerly separated, occur in this collection, very little can be 
added to the statements then made. Two specimens occur of Xylobius sigillarice, 
five of X. similis; three are somewhat doubtfully referred to X. fractns, eight to 
X. Dawsoni , and ten to Archiulus xylobioides. A single specimen of X. Dawsoni, 
showing four or five continuous segments, seems to prove that the elevated transverse 
ridge on each segment in this species was crowned by a single series of minute warts 
or raised points, not very closely set. A few specimens of different species exhibit 
the marks which were formerly interpreted as foramina repugnatoria, but are now 
presumed to be the casts of bases of spines,! thus bringing these species into more 
definite and probable relations to the carboniferous myriapods of Mazon Creek, though 
they plainly belong to a distinct group. Whatever spines they had must have been 
very small, slight, and wholly insignificant in comparison with those of the bristling 
Archipolypoda of the Morris beds. Careful search has been made for any other of those 
special features which distinguish the Archipolypoda from recent Diplopoda, but in 
vein, beyond the single but not unimportant point that the ventral plates, in Archiulus 
at least, are very broad and probably almost equally extensive in lateral expansion 
with the dorsal plates, a feature found nowhere in modern Diplopoda. 
This is, perhaps, most clearly shown m two new species of Archiulus , discovered 
among these remains, and to which are referred a dozen or more specimens. One of 
these species is of about the same size with A. xylobioides, but has perfectly flat 
segments showing only a very slight and narrow transverse ridge at the anterior 
margin, occupying not more than one-fourth of the segment. The other is a smaller 
species, and has shorter and more simple segments, made slightly concave by the 
* For descriptions of the remains previously discovered, see Mem. Boat. Soc. Nat. Hist., vol ii 
pp, 231-239, 561-562 (1873, 1876). 
f Mem. Bost. Soc. Nat. Hist.,.vpl. iijL, pp. 148, 149 (1882). 
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