=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. Fig. 27. Hypostoma 2/1. » 28. The right macula 10/1. From Christiania, Haakavik, Collection of Dr. G. HOLM. =Olenus= sp. p. 33. Fig. 29. A part of the free cheek with the scallop 6/1. » 30. Profile of the scallop. Andrarum, Scania. =Parabolina spinulosa= WAHLENB. p. 33. Fig. 31. The free cheek with the scallop 3/1. » 32. Profile of the scallop. From Jemtland. =Paradoxides oelandicus= ANGEL. p. 64. Fig. 33. Hypostoma 2/1. » 34. The left macula 12/1. Öland, Torp. =Phacops cephalotes= BARR. p. 65. Fig. 35. The hypostoma; the shell mostly decorticated and the maculæ visible as casts on the inside. » 36. Cast of the inside of the right macula 12/1. Spec. from Lochkow, Bohemia. =Phacops quadrilineata= ANGEL. p. 66. Fig. 37. Horizontal section of cephalic eye near the inferior margin 30/1. The dark points lie in the outermost stratum of the cheek. » 38. Vertical section of cephalic eye 20/1. An irregularly hexaedral crystal below each lens. Specimen from Wisby _a_. K. Sv. Vet. Akad. Handl., Bd 34, No 8. Lindström: Trilobites. Pl. V. [Illustration] G. Liljevall del. Ljustryck af Chr. Westphal Stockholm. Pl. VI. =Phacops macrophthalmus= BURM. p. 65 Fig. 1. Horizontal section of the cephalic eye 30/1. » 2. A similar one near the inferior margin, _a_ cheek 30/1. » 3. Vertical section of a cephalic eye 30/1. » 4. A similar, twice as much enlarged 60/1. » 5. Also a similar, _a_ cheek 30/1. » 6. Hypostoma 2/1. Spec. EA. » 7. The wings of the hypostoma, seen without foreshortening 4/1. EA. » 8. The diminutive right macula 12/1, surrounded by incoherent terrace lines. » 9. The left macula 12/1. Specimens from Gerolstein Eifel, Devon. =Acaste= sp.? p. 51. Fig. 10. The hypostoma 8/1. From Mulde, Fröjel, Gotland. =Phaëtonides Stokesi= MURCH. p. 66. Fig. 11. Hypostoma 4/1. Gotland, Eksta, Djupvik. =Phillipsia= sp. p. 66. 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.