Part 22

=Agnostus glandiformis= ANGELIN p. 35.

Fig. 7. Vertical section of a part of a rolled up specimen 8/1. Specimen signed CQ. Andrarum, Scania.

=Asaphus expansus= L. p. 39.

Fig. 8. Horizontal section of the eye near the upper margin. a. The surrounding spongious zone, b. The surface of the eye with lenses 60/1. Spec. CG. » 9. Horizontal section from the centrum of the eye 60/1. Spec. CF. » 10. Horizontal section near the inferior margin, a the eye, b marginal zone, c a portion of the cheek 60/1. Specim. CF. » 11. Vertical section near the inferior margin 60/1, same specimen as in fig. 10. » 12. Eye fractured vertically showing regular prisms in the eye (a) and irregular ones in the marginal zone (b) 30/1. » 13. Part of the hypostoma with the macula 12/1. » 14. The right macula from the inside 12/1. » 15. A vertical section across the hypostoma, aa the maculæ 8/1. » 16. A similar one of the macula at left in the preceding figure 60/1. » 17. The right macula from the outside in transmitted light 60/1. Sp. BQ.

=Asaphus fallax= DALM.? p. 41.

Fig. 18. Horizontal section of the eye 60/1. Spec. CD. » 19. Vertical section of the same passing obliquely through two rows of prisms 60/1. » 20. Fragment of the same eye with entire prisms 30/1. » 21. The hypostoma seen from the inside 3/1 from Sandvik, Öland. » 22. The left macula 12/1. Spec. BO. From Vestanå, Östergötland.

=Asaphus raniceps= DALM. p. 40.

Fig. 23. The left macula 12/1. Spec. BV. » 24. Horizontal section of right macula 60/1. Spec. BY. » 25. Vertical section of a macula 60/1. » 26. A similar section of a macula (a) in the longitudinal axis of the hypostoma 12/1. Exterior surface at right. All from Östergötland.

=Asaphus= sp. p. 41.

Fig. 27. A portion of the eye near the superior margin 30/1. » 28. Horizontal section of the eye 60/1. » 29. Horizontal section near the inferior margin 60/1. » 30. Vertical section near the superior margin 60/1. All figures from specimen CE. From Gotska Sandön.

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

Lindström: Trilobites. Pl. I.

G. Liljevall del.

Ljustryck af Chr. Westphal Stockholm.

Pl. II.

=Asaphus= (Isotelus) =gigas= J. HALL p. 42.

Fig. 1. The right macula surrounded by terrace lines 3/1. » 2. Horizontal section of a macula with a part of the test 60/1. » 3. Vertical section of the same, the surface of the outside upwards 60/1. All specimens from Cincinnati, Ohio, Hudson River group. Spec. BU.

=Bronteus irradians= LINDSTRÖM. p. 43.

Fig. 4. The hypostoma 4/1. » 5. The left macula 12/1. Specimen from Gotland, Löjsta.

=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.