1883, ] 205 [Packard, 
mouth-appendages of Pauropus are much nearer the normal type of those 
of the true Chilognaths than the degraded mouth-organs of the Sugentia. 
The body of Pauropus is cylindrical, the scutes are as much like those of 
Polyxenus as those of the Chilopods; the number of body segments ‘is 
seven, the same as in the larve of certain Diplopods; the feet are 6-jointed 
as in Diplopods, and there are nine pairs, six pairs to the four penultimate 
segments. The three anterior pairs are developed from two segments, 
#. @, arise from the ventral and lateral sclerites corresponding to two 
scutes. This fact should not, we venture to suggest, exclude them from 
the Chilognaths, as there is a considerable irregularity in the positions of 
the three pairs of anterior feet in larval Chilognaths. The terminal body- 
segment is much as in Chilognaths. When we examine the larva of Pau- 
ropus, we find a strong resemblance to the larval hexapodous Chilognaths. 
Hence we scarcely see good grounds for placing Pauropus in a distinct 
order from Chilognaths. Their distinctive characters, and they are im- 
portant ones, are we submit. only of subordinate value, and we should 
therefore place the Pauropoda as the second sub order of Chilognaths, 
throwing all the genuine Chilognaths into a first sub-order, 
Turning to Eurypauropus, we find that this singular form is in a degree 
& Connecting link between Pauropus and Polyxenus; the head has much 
the same shape, the antennw being inserted beneath far back from the 
front edge of the broad top; the legs are much the same shape, and more 
truly diplopod than in Pauropus, as they are arranged nearly in two pairs 
to a segment; there are six segments, four of them bearing legs, there 
being nine pairs of legs to four scuta, The scutes are much as in Polyx- 
enus, spreading out flat on the sides, the animal being elliptical oblong, 
broad and flat. There are no true sternites like those of Chilopods, and 
though the feet are inserted wider apart, the entire structure of the soft, 
membranous sternal region is much as in Polyxenus. We therefore feel 
warranted, although originally accepting the ordinal rank of the Pauropoda, 
assigned them by Sir John Lubbock, in regarding them as Chilognaths, 
with aberrant features which would throw them into a suborder of the 
latter group. 
The Systematic Position of Scolopendrella. ‘This singular form is usually 
regarded as a Myriopod, while Mr, Ryder refers it to a distinct order, 
Symphyla. We have already* given our reasons for the view that it 
is a Thysanuran,| with only superficial resemblances to the Chilopod 
Myriopods. Our fresh studies on the latter confirm our opinion. that 
the Scolopendrella is a hexapod. The mandibles and mavxille, the 
former especially, are like those of the Thysanura, rather than the myrio- 
pods, not being divided into two parts (stipes and cardo). It seems to us 
that Scolopendrella with its numerous postcephalic legs may fulfill the 
* American Naturalist, xv, 698, Sept. 188i. 
+ Compare the excellent figures of the mouth-parts of Seolopendrella in Dr, I. 
Muhr, Die Mundtheile in Scolopendrella und Polyzonium, loer Jahresbericht 
Uber das Deutsche Staats Gymnasium in Prag-Altstadt, 1881-2. Prag, 1882. 
