78 MR. F, R, C. REED ON THE GENUS LICHAS. [Feb. 1902, 
pair not being marked off from the post-axial piece posteriorly, ‘nor 
making any projection beyond the rounded posterior margin. 
Fig. 12.—Lichas depressus, Ang. (After Schmidt.) 
[a from ‘ Rey, Ostbalt, Silur. Trilob.’ pt. ii, pl. iv, figs. 1 a, 2, & 38a; 
b from pl. iv, fig. 4.] 
Section B. 
L. (Homolichas) depressus, Ang. LI. Eichwaldi, Nieszk. 
L. Pahleni, Schm. 
The species L. Schmidti, with the free points of the third pair of 
pleure projecting, may be allied to the above, and seems to lead to 
a subsection comprising those species which possess similar characters 
in the head-shield and, for the most part also, in the pygidium ; but 
Fig. 13.—Lichas angustus, Bey. Fig. 14.—Lichas deflexus, Syoqr. 
(After Schinidt.) (After Schnidt.) 
/ 
[From ‘ Rey. Ostbalt. Silur. Trilob.’ [Op. cit. pl. iv, fig. 35.] 
pt. ii, pl. iv, fig. 18 @.] 
the pleural furrow of the incomplete third pleure curves round to meet 
the axial furrow and to enclose a smal] oval area, and the ends of 
this pair of pleure form blunt projections on the margin of the 
pygidium. The following species are included :—L. defleaus, Sjégr., 
L. angustus, Beyr., and ?L, cwcatricosus, Lovén & Angelin non Schmidt. 
Section C (Fig, 15, p. 79.) 
The group of species in this section shows many points of affinity 
with the preceding. The anterior portion of the median lobe of the 
