Vol. 58.] MR. F, R. C, REED ON THE GENUS LICHAS, 15 
Section E will accordingly have 
Fig. 8.—Lichas Ribeiroi, JL. cicatricosus, Schmidt (non Lovén) 
Delg. (After Delgado.) as its type; and the following examples 
may be mentioned :— 
Srction EH. 
LI. cicatricosus, Schmidt nen Lovén. 
L. hibernicus, Portl. (pars). 
L. equalis, Torng. 
?L. St.-Matthie, Schmidt. 
SEoTion F, (Fig. 8.) 
The form Uralichas Ribetro is marked 
off from all the other members of the 
Lichadide by the peculiar nature of its 
pygidium, with its long caudal spine of 
the pair of partly fused and enrolled 
third pleure. The characters of its 
head-shield are almost identical with 
those of Section D, of which it may 
perhaps be considered a special offshoot. 
Section F, 
L. (Uralichas) Ribeiroi, Delg. 
| Section G. (Fig. 9.) 
| To this section belongs the most 
i modified form of the first group, Lichas 
( (Arges) armatus. The bi-composite lobes 
[From ‘Faun. Silur.Portug’] are circumscribed, but the fourth lateral 
pair is fused with the fixed cheeks. 
Fig. 9.—Lichas armatus, Goldfuss. (After Groldfuss.) 
| 
[From Nova Acta Acad. Cas. Leop.-Carol. vol. xix, pt. i, pl. xxxiii, 
figs. la & 1c.] 
