80 MR, F. BR. C. REED ON THE GENUS ZICHAS. [Feb. 1902, 
Fig. 16.—Lichas illeenoides, Mieszk. (After Schmidt.) 
a b 
[a from ‘ Rey. Ostbalt. Silur, Trilob.’ pt. ii, pl. iii, fig. 27 a; 
6 from pl. iii, fig. 29.] 
Section F, (Figs. 17 & 18.) 
In this section the occipital lobes are absent, and the neck-ring 
forms a regular band. The pygidium has two rings on the axis, a 
post-axial piece not defined posteriorly, and three pairs of pleure, 
Fig. 17.—Lichas dalecarlicus, Fig. 18.—Lichas levis, Hichw. 
Ang. (After Schmidt.) (After Schmidt.) 
———— 
Z 
y 
[From ‘ Rey. Ostbalt. Silur. Trilob. [ Op. cit. pl. vi, fig. 10.] 
pt. ii, pl. vi, fig. 12 a.] 
each with a pleural furrow and free point, but the third pair is in- 
completely defined from the post-axial piece, and its free points are 
short and blunt. 
Szcrion F, 
L. (Platymetopus) levis, Hichw. L, kildarensis nom. prop. (=L. hiber- 
L. dalecarlicus, Ang. nicus, Portl. pars. Head-shield, non 
L. Holmi, Schm. pygidium or thorax.) 
Secrion G. 
The species Verataspis grandis marks another section, of which 
the characters are those of this species. So far no members of this 
section appear to have been found in Europe. The kind of modifi- 
cation is similar to that of Arges in Group I, and it appears to be 
an instance of heterogenetic homceomorphy. 
Szcrion G. 
L. (Terataspis) grandis, Hall. 
