Fig. 9. Vertical section of macula (a) 12/1. Öland, Lower
grey Orthoc. limestone.
Nileus armadillo Dalm. p. 62.
Fig. 10. Horizontal section of cephalic eye 60/1.
» 11. Vertical section of the same 60/1.
» 12. A similar section 60/1. a the prisms of clear
calcareous spar, b the surface of the eye and
the free cheek of yellow spar.
» 13. The hypostoma 2/1.
» 14. The right macula 12/1.
» 15. Vertical section of macula (a) 12/1. All specimens
from Persnäs, Öland, excepting fig. 13 from Westanå,
Östergötland.
Symphysurus palpebrosus Dalman p. 62.
Fig. 16. Horizontal section of cephalic eye 60/1.
» 17. Vertical section of the same 60/1.
» 18. Hypostoma 2/1. From Westanå, Östergötland.
Niobe frontalis Ang. p. 63.
Fig. 19. The hypostoma 2/1.
» 20. The right macula 10/1.
» 21. Part of the same in transmitted light 60/1.
Specimen from Kungs Norrby, Östergötland.
Niobe læviceps Ang. p. 63.
Fig. 22. Horizontal section of cephalic eye near the inferior margin,
a cheek 60/1.
» 23. Hypostoma 2/1.
» 24. The right macula 10/1.
» 23. Part of the same in transmitted light 60/1.
» 26. Vertical section of macula a 12/1.
Ogygia dilatata var. Sarsi Angel. p. 63.