74 MR. F. R. 0, REED ON THE GENUS LICHAS. {[ Feb. 1902, 
Lovén’s figure. The pygidium of the type appears to resemble that 
of L. deflewus which belongs to the second group. M.Schmidt, on the 
strength of the similarity of ornamentation, associates-with the head- 
shield (op. cit. fig. 25) attributed by him to ZL. cicatricosus, Lov. a 
peculiar pygidium (fig. 26). The bead-shield shows a pair of well 
circumscribed bi-composite lobes, and the essential features of 
Fig. 6.—Lichas cicatricosus, Schmidt non Lovén. (After Schmidt.) 
so eNO) 
a h 
[a from ‘ Rey. Ostbalt. Silur. Trilob.’ pt. ii, pl. v, fig. 25.4 ; 
b from pl. v, fig. 26.] 
Section C. The axial furrows are incomplete, being quite obsolete 
behind the bi-composite lobes; the fourth lateral lobes are absent ; 
the first lateral furrows are continued back to the neck-furrow by 
short additional furrows; and occipital lobes are present. The 
pygidium possesses two rings on the axis, a triangular post- 
axial piece, completely defined 
Fig. 7.—Lichas hibernicus, Portl. and pointed posteriorly, and 
pars. (After Portlock.) three pairs of complete pleurze 
on the lateral lobes with free 
obtuse ends; the first two pairs 
have pleural furrows, and the 
third pair are in contact in 
the middle line behind the post- 
axial piece. 
The pygidium of L. hiberni- 
cus, Portl.! is closely similar, as 
M. Schmidt ? has remarked, but 
the head-shields attributed by 
Portlock (op. cet. pl. v, figs. 1-3) 
[From ‘Rep. Geol. Londonderry’ to this species gers te belong 
pl. iv, fig. 1 ¢.] to another species, for their 
ornamentation is different from 
that of the pygidium, as an examination of the type-specimens 
confirmed. Accordingly it seems necessary (1) to separate Schmidt’s 
L. cicatricosus from Lovén’s species bearing the same name; and 
(2) to give a new specific name to the head-shields usually called 
L. hibernicus. If the above conclusions are adopted L. kildarensis 
is suggested for the latter, which belongs to the second group of 
Lichadide. 
1 « Rep. Geol. Lond.’ 1843, p. 274 & pl. iv, figs. 1 a-d. 
2 ‘Rey. Ostbalt. Silur. Trilob.’ pt. ii (1885) p. 29. 
