398 F. R. Cowper Reed—A New Species of Lichas. 
The head-shield is ornamented with rather widely spaced, round 
tubercles, of moderate and fairly uniform size, between which are 
scattered smaller secondary and tertiary ones without any regular 
arrangement and usually at some distance apart. 
Thorax of eleven segments, not decreasing much in width posteriorly. 
The axis, however, which is strongly convex and prominent, is 
conical in shape, tapering rather rapidly towards the pygidium to 
half its anterior diameter. The ornamentation of the axis consists 
of small sharp tubercles of fairly equal size, not closely placed nor 
regularly disposed, with a few smaller ones interspersed. The axial 
furrows are strong. 
The pleure are of uniform size and overlap slightly; their inner 
‘half is arched up gently, while their outer half bends down slightly 
and curves backward to end in a faleate point. Each pleura bears on 
its feebly convex surface a well-marked submedian and _ slightly 
diagonal furrow, which dies out shortly before reaching the point. 
The tubercles, which are lke those on the axis, are usually arranged 
in a single row of widely spaced primary ones alternating with 
a double row of secondary or tertiary ones along each side of the 
diagonal furrow. 
Pygidium of rather a transverse shape, not quite twice as broad as 
long, with a convex axis of less than one-fourth the total width and 
lateral lobes composed of two pairs of complete pleurz ending in free 
marginal points, and of one incomplete pair followed by a median 
postaxial piece. The ends of the third pair of pleure form a pair of 
short blunt projections, closely placed, and give a bifurcate posterior 
termination to the pygidium. The axis is prominent, convex, and 
subcylindrical; the strong axial furrows scarcely converge at all 
posteriorly and are prolonged with undiminished strength nearly as 
far behind it, but do not reach the posterior margin. The axis 
extends for about half the length of the pygidium, and its convexity 
is continued into the anterior portion of the post-axial piece, dying 
out rather suddenly. A weak curved furrow (sometimes interrupted 
in the middle) crosses over this median convexity and defines the axis 
behind, the axial furrows bending in slightly at this point on each 
side. There are 2 to 3 complete well-marked rings on the front end 
of the axis followed by traces of 1 to 2 fainter incomplete rings. 
Each pleura of the first pair on the lateral lobes has a subfalcate 
shape and is curved gently backwards beyond the weak fulcrum, 
ending in a short free recurved point ; a submedian diagonal furrow 
traverses about two-thirds of its length, and is inclined at about 15° 
to the front edge of the pygidium. 
The second pleura is separated from the first by a slightly sinuous 
furrow nearly parallel to the diagonal furrow of the first pleura. 
This pleura is more leaf-shaped and has a narrow base; its end forms 
a short recurved free point like the first, and its surface bears 
a diagonal furrow nearer the anterior than the posterior margin of 
the pleura and parallel to the first interpleural furrow. The inter- 
pleural furrow between the second and third pleura makes an angle of 
about 45° with the axial furrow. As stated above, the third pleura 
‘is incomplete, not being marked off from the post-axial piece by 
