On the (i('Hii>< Ainpyx. — -Vogde-s. 105 
salient frontal. The facuil sutnres in Avip^.r roudultl Barr, run 
from tbo anterior borders of the glabeUa in an almost straight 
line to the posterior border which they cut near the genal angles 
near the ends of the first i)leunv: see also Aiapij.r ndsutiis Dalm 
and A. donuitus. In Antpi/.r cusfiffiis Boeck, the facial sutures 
form a sigmodial curve cutting the anterior border about midway 
and the posterior border near the genal angles. The eyes are 
wanting. The hypostonia lias not Ix'cn observed. Occipital ring 
iind furrow well defined. The thorax consists of six segments in 
Aitipyx it(i)<i(tii.Sj uA.cDsfitfiis^Sii'. Aiiipi/.iscflrosfrlx, A. porlocAi, A. 
roiianhi, A.intrvidns and . 1 . hit us have only five segments. Barrande 
■observes that in undeveloped specimens of Ampy.r roiumlti there 
are only three or four segments in the thorax. The axis is 
always distinct: the lateral lobes form a plane surface, with hori- 
zontal pleurte. They are sometimes marked with lateral rows of 
tubercles on the axis as in Ainpt/.r nmhis. The pleurae are hori- 
zontal and divided by an olilitjue furrow which extends from the 
dorsal furrows to the tips, the knee occupies a place near the 
extremity, and forms a very short slope. The pygidium is sub- 
triangular in outline, sometimes rounded. i)resenting a horizontal 
surface, with ? prominent axis. The axis of Anipyx rostratus is 
faintly segmented with a row of tul)ercleson each side; that of A. 
mains has nearly 20 articulations, and that of ^. tet)-agonus shown 
no articulations. The lateral lobes are generally segmented. 
Noirrii A.MKRic.vN Species. 
Bn rifyoitlcs. 
\. Aifipijx aiiii'ricaims VoG. A Sak. 
