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(2 MR. F, Rk, C, REED ON THE GENUS LICHAS. [Feb. 1902, 
species, of which we knew only the pygidium or head-shield, we 
can associate them with it. The pygidial characters are :—(1) the 
possession of two rings on the axis; (2) a broad post-axial piece; 
and (3) three pairs of pleurz on the lateral lobes, each with free 
Fig, 2.—Lichas seaber, Beyr. (After Barrande.) 
a 
b 
[a from ‘Syst, Silur. Boh.’ pl. xxviii, fig. 24; 6 from pl. xxviii, fig. 22.] 
point and pleural furrow. ‘The first two pairs are complete, but the 
third pair is not completely marked off posteriorly from the post- 
axial piece. 
Suction B, 
LI. (Dicranopeltis) scaber, Beyr. LI. Woodwardi, Reed MS. 
LI. Barrandei, Fletch. ?L. Salteri, Fletch. 
Section C. (Fig. 3.) 
In this section the axial furrows of the head-shield are more or 
less obsolete posteriorly, occipital lobes are present, the pygidium 
Fig. 3.—Lichas margaritifer, Mieszk. (After Schmidt.) 
—— 
[a trom ‘ Rey. Ostbalt. Silur. Trilob.’ pt. ii, pl. v, fig. 17; 6 from pl. v, fig. 23, 
Fig. 3) does not show properly the incurving of the pleural furrows in the 
third pair.] 
has three rings on the axis and a post-axial piece, with the lateral 
lobes composed of three pairs of pleuree. Of these the first two pairs 
are complete, with pleural furrows and free points; but the third 
pair is incompletely marked off from the post-axial piece, and the 
pleural furrow curves inward towards the axial furrow, so as more 
or less to enclose a small oval area, The free points of this pair of 
pleure are closely placed together. 
