Bronteus laticauda Ang. p. 44.
Fig. 6. Horizontal section of the cephalic eye 20/1.
» 7. The same highly magnified 250/1.
» 8 & 9. Vertical sections of the cephalic eyes 20/1.
In fig. 8 with integument, in fig. 9 decorticated.
» 10. Hypostoma. Specim. N. 2/1.
» 11. The right macula, from the outside. Spec. O. 12/1.
» 12 & 13. Left maculæ, casts of the interior surface 12/1.
Specimens from Dalecarlia.
Bronteus platyactin Ang. p. 43.
Fig. 14. Vertical section of cephalic eye, a the eye.
b, cheek 20/1.
» 15. Hypostoma 2/1.
» 16. The same from the interior surface. Sockets
of the maculæ sunk in the shell 2/1.
» 17. The right macula 12/1.
» 18. Portion of the eye on the macula in transmitted light 20/1.
» 19. The same more magnified 60/1. Specimens
from the stratum b. Wisby, Norderstrand.
Bronteus polyactin Ang. p. 8.
Fig. 20. Horizontal section of cephalic eye 20/1.
» 21. Vertical section of the same 60/1.
» 22. Hypostoma 4/1.
» 23-25. Samples of right maculæ 20/1.
» 26. Horizontal section of macula, the portion
bearing the lenses 20/1.
» 27. Vertical section of the same 60/1, a the
lenses. Specimen from Stora Carlsö.
» 28. Hypostoma 4/1.
» 29. The right macula 12/1.
» 30. A portion of the lenses on the macula in reflected
light 30/1. The lenses are only faintly convex and
encased in a white frame. The diameter of the largest
lenses 0,06 millim. Specimen from Lansa, Fårö.
Bumastus barriensis Murch. p. 46.
Fig. 31. Hypostoma 4/1.
» 32. The right macula 12/1. Specim. CU from Wisby.
Bumastus sulcatus Lindst. p. 46.
Fig. 33. Horizontal Section of a cephalic eye 20/1.
» 34. The same magnified 60/1.
» 35. A similar, near the inferior margin and close
to the surface, a the eye, b cheek 60/1.
Compare fig. 38.
» 36. Vertical section of the cephalic eye near the
suture 20/1.
» 37. The same, more magnified 60/1.
» 38. A similar, near the inferior margin, a eye,
b cheek 60/1.
» 39. Cast of the interior surface of a hypostoma 2/1.
» 40. The same seen from the side.
Originals to figs. 33-38 from Samsugu,
Othem, Gotland, figs. 39 & 40 from Stora
Vede, Follingbo, Gotland.