Fig. 12. A portion of the cephalic eye 20/1.
» 13. The hypostoma 4/1.
» 14. The right macula 12/1. Specimen from Beeren Eiland, Oswalds
förberg, communicated by Hr. J. G. Andersson.
Phillipsia sp.? p. 66.
Fig. 16. The hypostoma 3/1.
» 16. The right macula 12/1.
» 17. Horizontal section of the cephalic eye 60/1.
» 18. Vertical section of the cephalic eye, a cheek 60/1.
Probably from the Carbon of Belgium.
Proetus concinnus Dalm. p. 67.
Fig. 19. Horizontal section of the cephalic eye, a little oblique, at
right the innermost stratum with the rock 60/1.
» 20. Vertical section of the cephalic eye. The diameter of the
prisms 0,03 millim.
» 21. Hypostoma 4/1.
» 22. The right macula 12/1.
» 23. The same with a light, transparent spot 12/1. Specimen
from Djupvik, Eksta.
Proetus conspersus Ang. p. 68.
Fig. 24. A portion of the cephalic eye 20/1.
» 25. The hypostoma. Cast of the interior side 4/1.
» 26. Cast of the interior side of the left macula 12/1.
Fig. 24 from Öja, Gotland, the others from Kräklingbo.
Proetus signatus Ldm. p. 68.
Fig. 27. Hypostoma 4/1.
» 28-30. Three pair of maculæ with dark ocelli in a white spot.
Ptychopyge angustifrons Dalm. p. 69.