56 Mr. J. Wood-Mason on Scolopendrella. 
timate and antepenultimate somites—which obtain in Chilo- 
poda, and of the nature of the double somites in Chilognatha. 
The Head.—This is not so depressed as it is represented to 
be in the published figures, but is anteriorly deflexed, with the 
antenn articulated to the forehead, much as in the Chilogna- 
thous Myriopoda. Its anterior margin is divided by a median 
notch into two rounded, thickened, and highly indurated 
lobes, each armed at the extremity with three sharp spiniform 
processes supported by buttress-like thickenings and directed 
with their fellows of the opposite side towards the middle 
line, thus recalling the sharp and toothed rostrum of Chilo- 
enatha. 
On the upper surface of the head, behind the insertion of the 
antenne, and in the same transverse line as the mandibular 
articulations, lie a pair of smooth and slightly convex arez 
with an exceedingly sharply defined and doubly contoured 
oval outline; they appear to be cake-shaped involutions of the 
integument; and their walls are covered with a minute punc- 
tuation, which may possibly be the optical expression of the 
ends of fine canals. If a spirit-specimen of the animal be 
placed whole in a solution of hematoxylin for a few hours, 
these organs become filled, or their contents deeply coloured, 
by the reagent; so that they must freely communicate with 
the exterior. Whether they are glands, or stigmata, or eyes, 
can only be decided by means of sections; 11 would be worth 
while to compare them with the paired organs externally 
visible in the corresponding part of the head in Glomeris as 
conspicuous horseshoe-shaped impressions. Between these 
structures and the insertion of the antenne I have not yet 
succeeded in making out the “ round black eyes” which have 
been described by Menge; and it is possible that the two may 
be the same. 
Previous observers have all recognized two pairs of jaws 
in addition to the mandibles, namely a pair of first maxille 
and a pair of second maxille, equivalent to the so-called 
labium of insects, but no other cephalic appendages ; and they 
all appear to me to have misdescribed those that they have 
recognized, 
I, on the contrary, see in the supposed two pairs of gna- 
thites that succeed the mandibles but the coalesced parts of a 
single pair, resembling in all essential particulars the four- 
lobed plate that follows the mandibles and functions as a 
lower lip in the Chilognatha; and I have no doubt that the 
first pair of legs is the third pair of postoral appendages an- 
swering to the labium of insects. 
First Pair of Postoral Appendages.—In specimens mounted 
