stones, and are nocturnal, shunning, like the _Geophilidae_, exposure
to light; and as in the _Geophilidae_, the females guard their eggs
and young until the latter disperse to lead an independent life.

_Order 3. Craterostigmomorpha_.--Chilopods with twenty-one tergal
plates as in the typical genera of Scolopendromorpha, but with only
fifteen pairs of legs as in the Lithobiomorpha. As in some members of
the latter order there is a single ocellus on each side of the head,
the penultimate and antepenultimate segments of the toxicognaths are
complete on the postaxial side of the appendage, and spiracles are
present upon the 3rd, 5th, 8th, 10th, 12th and 14th leg-bearing
somites. In the size and shape of the head, of the toxicognaths, of
the tergal plate of this somite, and of the first leg-bearing somite,
great similarity to some genera of Geophilomorpha (e.g.
_Mecistocephalus_) is presented; but in the structure of the posterior
end of the body this order differs from all the other orders of
Chilopoda. The skeletal elements of the last leg-bearing segment are
welded together to form a subcylindrical tube, and the genital and
anal somites are represented by a pair of chitinous valves capable of
opening below for the escape of the genital and intestinal products.

[Illustration: After Pocock. Q.J.M.S. vol. 45, pl. 23, 1902.

FIG. 8.

A, Anterior end of _Craterostigmus_ from above.

a, Basal segments of antennae.

c, Cephalic plate with eyes (o).

t.tox, Tergal plate of somite bearing toxicognaths (tox).

t.lg.1, Tergal plate of somite bearing legs of the first pair.

B, Maxillae.

C, Palpognath.

D, Toxicognath.

E, Last segment with genital capsule (g.c), and basal segments of
legs of 14th and 15th pairs (lg. 14, lg. 15).]

This order, containing the family _Craterostigmidae_, is based upon a
remarkable genus and species _Craterostigmus tasmanianus_, of which
only two specimens are known. These were collected under stones upon
the summit of Mount Rumney in Tasmania. They are about 1-1/2 in. in
length; but nothing has been recorded of their habits. The chief
morphological interest attaching to _Craterostigmus_ is that, apart
from certain structural peculiarities of its own, it presents features
previously believed to be found exclusively either in the
Scolopendromorpha, or the Geophilomorpha, or the Lithobio