76 MR. F. R. C. REED ON THE GENUS LICHAS. [Feb. 1902, 
The pair of curved spines near the front end of the glabella, the 
long spines of the fixed cheeks, the long genal spines, and the 
remarkably spinose pygidium are among the remarkable features 
of this species. [Dr. Giirich, Neues Jahrb. Beilage-Band xiv (1901) 
p- 531, puts it by itself in a new subgenus, Ceratarges. | 
Sxction G, 
L, (Arges) armatus, Goldf. 
Section H. (Fig. 10.) 
The last section of this group comprises those few species in 
which the fourth lateral lobes appear to have been squeezed out, so 
that the glabella has, as lateral lobes, only the one pair of bi- 
composite lobes. Occipital lobes are absent; and in the species 
Fig. 10.—Lichas ornatus, Any. (After Schmidt.) 
[a from ‘ Rey. Ostbalt. Silur. Trilob.’ pt. ii, pl. vi, fig. 18@; 5 from 
pl. ya, fiz, 205] 
(Lichas ornatus) of which the pygidium is known, there is in the 
latter part one axial ring, a broad post-axial piece, and three 
pairs of complete pleurze, each with pleural furrow and the two first 
also with free points. 
Srecrion H. 
L. (Oncholichas) ornatus, Ang. | L. gotlandicus, Ang. 
Note.—There is the well-known British species L. laxatus, McCoy, 
for which a place does not seem naturally to exist in the above 
scheme. The head-shield has its essential points agreeing with those 
of Section C [in which Dr. Giirich places it |, and the pygidium agrees 
in the number and course of its furrows; but there are four rings 
on the axis, and a strong rounded margin. It seems, on the whole, 
desirable at present to put this species in a subsection of Section C, 
Of L. Geikiei,’ which belongs to Group I, we do not know sufficient 
to be able to decide its true affinities or sectional position. 
Group LI. 
The second stage in the modification of the glabellar lobes of the 
Lichadide marks out likewise a natural group characterized by 
the possession of a single pair of tri-composite glabellar lateral 
1 Etheridge & Nicholson, ‘ Monogr. Silur. Foss. Girvan’ fase. ii (1879) p. 187 
& pl. x, fig. 1. 
