350 On the Morphology of the Myriopoda. 
thus :—“ It is a caterpillar-like segmented creature, three or 
four centimeters long, composed of ten similar and equal seg- 
ments, besides a small head; each of the segments, excepting 
the head, bears a single pair of stout, clumsy, subfusiform, 
bluntly- pointed legs, as long as the width of’ the body, and 
apparently composed of several equal joints. Hach segment 
also bears four cylindrical but spreading bunches of very 
densely packed, stiff, slender, bluntly tipped, rod-like spines, 
a little longer than’ the legs. The bunches are seated on 
mammille and arranged in dorsopleural and lateral rows.’ 
We do not recognize in this description any characters of a 
myriopodous nature ; on the contrary, in what is said about 
the head, “ composed of only a single apparent segment” 
(p. 165), ’and of the legs in the above description, and again 
on p. 165, where it is remarked, “ The legs were different in 
form {from those of modern Chilopoda], but their poor preserva- 
tion in the only specimen in which they have been seen, prevents 
any thing more than the mere statement of the following dif- 
ference ; “while the legs of Chilopoda are invariably horny, 
slender, ’ adapted to wide extension and rapid movement, those 
of Paleocampa are fleshy, or at best subcoriaceous, very stout 
and conical, certainly incapable of rapid movement, and 
serving rather as props,” the author appears to be describing 
rather a caterpillar-like form than a Myriopod. It seems 
to us that the larve of the neuropterous Panorpide, with their 
two-jointed abdominal prop-legs, small head, and singularly 
large spinose spines, arising in groups from a tubercle or 
mamilla, come nearer to Palceocampa than any Myriopod 
with which science is at present acquainted. For these reasons, 
and while the nature of these fossils is so problematical, we 
should exclude them, as regards the Myriopods, from any 
genealogical considerations. 
We have also attempted to show that the Archipolypoda* 
are a subdivision of Chilognaths, allied not remotely to the 
Lysiopetalide ; or at least that they are true diplopod Myrio- 
pods. Hence we are still reduced for our materials for a 
phylogeny of the Myriopods to existing orders, Pauropus 
being, perhaps, a more aberrant and stranger type than any 
fossil forms yet discovered. 
* “The Systematic Positions of the Archipolypoda, a Group of Fossil 
Myriopods,” Amer. Naturalist, 326, March 1883. 
