Vol. 58.] MR. F. R. C, REED ON THE GENUS LICHAS. 73 
Section C. 
L. (Platylichas) margaritifer, Nieszk. L. bifurcatus, Reed. 
LL. docens, Schm. ‘L, Grayi, Fleteh. 
Section D. (Figs. 4 & 5.) 
In all the head-shields of this section we notice the presence of 
complete axial furrows and of occipital lobes, but a strong tendency 
exists for the third lateral furrows to become obsolete. In the 
pygidium of Lichas affinis and some allied species, which appear 
to belong here, the third pair of pleure have lost their free points. 
The species L. celorrhin and L. pachyrhina are closely allied ; 
the pygidium ascribed to the latter shows two rings on the axis, 
Fig.4.—Lichas verrucosus, Hichw. Fig. 5.—Lichas affinis, Ang. 
(After Schmidt.) (After Angelan.) 
h NY 
[From ‘ Rev. Ostbalt. Silur. Trilob.’ [From ‘ Pal. Scandinavy.’ pl. xxxviii, 
. pt. ii, pl. ii, fig. 1 @.] fig. 4 .] 
a broad post-axial piece, and three pairs of pleure, of which 
the first two are completely defined and have each free points and 
pleural furrows. The third pleure have also simple pleural furrows 
and free points, but are incompletely marked off from the post-axial 
piece posteriorly.’ [To this section belong Dr. Giirich’s Metopolichas 
(= Metopias) and Pterolichas (=Arctinurus). The latter may 
mark a subsection, and probably his subgenus Platopolichas also 
belongs here and likewise designates a subsection, the third pleure 
of the pygidium possessing free points, but not pleural furrows. | 
Section D, 
L. (Metopias) Hiibneri, Eichw. L. celorrhin, Ang. 
L. verrucosus, Eichw. LL. pachyrhina, Dalm. 
L laciniatus, Dalm. 2 L. kuckersianus, Schm, 
L. bulbiceps, Phill. ?L. (Arctinurus) Boltoni, Bigsby. 
L. conformis, Ang. ’L. (Platopolichas) avus, Barr. 
L, affinis, Ang. ’L. (Platopolichas) incolu, Barr. 
Secrion E. (Figs. 6 & 7, p. 74.) 
The species attributed to Lichas cicatricosus, Lovén? by M.Schmidt’* 
does not show the pygidial characters of the type according to 
1 The accuracy of the association of some of the pygidia with head-shields 
belonging to this section is rather doubtful. 
2 Ofv. K. Svensk. Vet.-Akad. Forhandl. vol. ii (1845) no. 3, p. 56 & pl. i, fig. 8. 
> «Rey. d. Ostbalt. Silur. Trilob.’ pt. ii, Mém. Acad. Imp. Sci. St. Pétersb. 
ser. 7, vol. xxxiil (1885) no. 1, p. 122 & pl. v, figs. 25, 26. 
