The cephalic eyes are much destroyed, but seem to have consisted of somewhat semi-prismatic lenses or prisms of the same type as Dysplanus.
Phillipsia No. 3 ([pl. VI figs. 12-14]) from the Carboniferous strata of Beeren Eiland communicated by Hr J. G. Andersson. It comes near the preceding, is lengthened, but has broader and shorter anterior wings and the inferior surface just above the posterior border peculiarly pitted. The macula lying above this pitted field are ovate. The lenses of the cephalic eye are hemispheric on the surface.
Platymetopus Angelin.
Pl. planifrons Angelin.
This genus may well be kept distinguished from Lichas in consequence of its peculiar hypostoma and its still more peculiar maculæ, not to remind of the other deviating features. The maculæ lie at the end of narrow, sigmoid grooves of their own above the long transverse groove, separating the posterior border from the anterior elevated moiety. They are elongated, curved and entirely covered with a great number of irregular lenticles, translucent through the thin covering membrane.
Pliomera Ang.
Pliomera Törnquisti Holm in Trilobit. Dalecarliens p. 5 fig. 2.
While Pl. Fischeri and Pl. actinura not have any hypostomic maculæ, this species, which Dr. Holm with some doubt joins in the same genus, has a hypostoma, which as to its general shape resembles that of both the mentioned species, evenly rounded at its posterior border, with a shallow groove encircling the central field. A little below the horizontal diameter of this the maculæ stretch obliquely inwards and downwards. They rest on a little elevation and are elongate, anteriorly acuminated. The figure on Holm's plate does not show the maculæ.
Proetus Steininger.