Part 23

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.

=Bumastus= sp. p. 47.

Fig. 41. Horizontal section of cephalic eye, near the inferior margin, a eye, b cheek, 60/1. » 42. Vertical section of the same 60/1. » 43. A similar near the inferior margin, a eye, b cheek, 60/1. » 44. Hypostoma 4/1. » 45. Side view of the same. » 46. The right macula 12/1. Specimens from Korpklint near Wisby.

=Bumastus= sp. p. 46.

Fig. 47. Hypostoma 4/1. » 48. The right macula 12/1. Specimen from Klints, Othem, Gotland.

K. Sv. Vet. Akad. Handl., Bd 34, No 8.

Lindström: Trilobites. Pl. II.

G. Liljevall del.

Ljustryck af Chr. Westphal Stockholm.

Pl. III.

=Bumastus= n. sp. p. 47.

Fig. 1. Hypostoma 4/1. Specimen AY. From Wisby, Norderstrand. » 2. Its left macula 12/1.

=Bumastus= n. sp. (different from the preceding) p. 47.

Fig. 3. Hypostoma 4/1. Spec. AT from Wisby, Norderstrand. » 4. Vertical section of the macula a in its longest axis. » 5. A portion of the cephalic eye, the facets very low.

=Calymmene intermedia= LINDSTR. p. 48.

Fig. 6. Hypostoma 4/1. Spec. BG from Gotland. » 7. The left macula 12/1.

=Calymmene tuberculata= BRÜNNICH p. 48

Fig. 8. The inside of the hypostoma 3/1. Spec. BA from Gotland. » 9. Horizontal section near the surface, seen from the inside 20/1.

=Chasmops macroura= (?) p. 49.

Fig. 10. The left macula, cast of the inside 12/1. Rostock.

=Chirurus glaber= ANG. p. 50.

Fig. 11. A portion of the surface of the cephalic eye 12/1. From Dalecarlia.

=Chirurus ornatus= DALM. p. 50.

Fig. 12. Horizontal section of a Cephalic eye near the surface 60/1. » 13. Vertical section of the same, 20/1, at the inferior margin. A line added to show the supposed size of the fragmentary lenses. » 14. The left macula of the hypostoma 12/1. From Östergötland, Westanå.

=Chirurus spinulosus= NIECZKOWSKI p. 51.

Fig. 15. The right macula of the hypostoma from the inside 12/1. Belongs to Dr. G. HOLM, from Esthonia, Kuckers C^2.

=Chirurus= sp. p. 51.

Fig. 16. The left hypostomic macula 12/1. Öland, Brunsby kanal.