Pl. IV.
Chirurus speciosus His.
Fig. 1. The right macula, cast of the interior side 12/1.
Specimen from Grumpevik, Vamlingbo, Gotland.
Cybele bellatula Dalm. p. 52.
Fig. 2. The hypostoma 3/1. Vestanå, Östergötland.
Dalmanites sclerops Dalman p. 54.
Fig. 3. The hypostoma 2/1.
Encrinurus punctatus Wahlenb. p. 56.
Fig. 4. Horizontal Section of an eye 69/1. Diameter
of the prisms 0,04 mill., their length 0,07 millim.
» 5. The hypostoma 3/1.
» 6. The left macula. Reflected light 12/1.
» 7. Part of the left macula in transmitted light 20/1.
The black streaks are sectioned pores. Spec. BH.
» 8. Vertical section of the right macula, a sagittal
section 20/1. BH.
» 9. A similar one a along the shorter diameter 20/1.
Specimens 5, 6 from Vikers Boge, 4, 9 Medebys, Hall,
7, 8 Svarfvarehuk. All from Gotland.
Encrinurus lævis Ang. p. 56.
Fig. 10. Horizontal section of the cephalic eye.
» 11. Vertical section of the same. Both 60/1.
Prisms 0,05 in breadth, 0,06 in length. Specimen
from Wisby.
» 12-17. Longitudinal profiles and anterior margins of the
hypostomas of Encr. punctatus (figs. 12, 13),
E. obtusus (figs. 14, 15) and E. lævis (figs. 16, 17).
Harpes vittatus Barr. p. 31.
Fig. 18. The two ocelli at right 8/1.
» 19. Sagittal Section of two ocelli 60/1. Specimen from Lochkow
E, e^2, Bohemia.
Homalonotus Knighti König p. 57.
Fig. 20. The hypostoma 3/2.
» 21. The right macula, from the interior side in transmitted
light 20/1. From Scania.
Illænus chiron Holm p. 58.
Fig. 22. Horizontal Section of an eye.
» 23. Vertical section of the same, both 60/1. Spec. AG.
» 24. Hypostoma 2/1. Spec. AF.
» 25. The right macula seen in reflected light. The lenses
translucent 12/1. Ex. AA. All from Persnäs, Öland.
Illænus Esmarki Schloth. p. 511.
Fig. 26 & 27. Horizontal sections of the eyes in two different
specimens 60/1.
» 28. Vertical section of an eye 60/1.
» 29. Likewise, a the eye, b a portion of the
cheek 12/1.
» 30. Hypostoma 2/1.
» 31. The inside of the right macula 12/1. Spec. AR.
» 32. The outside of the left macula in transmitted light 60/1.
» 33. Sagittal section of the macula (a) 60/1.
All specimens from Vestanå, Östergötland, excepting
fig. 30 belonging to Dr. Holm, from
Norway, Bjerkaas.
Illænus gigas Holm P. 59.
Fig. 34 & 35. Surface views of the prisms of the eyes, fig. 34 at
the superior margin and 35 at the inferior one 12/1.
» 36. Cast of the inside of a hypostoma 1/1. Same original as
Holm's fig. 6 Tafl. I, Illænider.
» 37. Cast of the inside of the left macula. Same specimen 12/1.
Illænus Roemeri Vollborth (Ill. vivax Holm) p. 59.
Fig. 38. Hypostoma 1/1. Spec. AO.
» 39. The right macula; the lenses translucent in reflected light
12/1. Spec. AO.
» 40, 41. Both maculæ of another, larger specimen 12/1. Sp. AP.
From the Leptæna limestone of Dalecarlia.
Illænus sphæricus Holm p. 59.
Fig. 42. The prisms of cephalic eye 12/1. }
» 43. The right maculæ, transparent in }
transmitted light 12/1. Sollerön, } Spec. AH.
Dalecarlia. }
Lichas sp. p. 60.
Fig. 44. The hypostoma 1/1.
» 45. Cast of the inside of the right macula 12/1. Spec. T.
» 46. Cast in wax of the preceding 12/1.
» 47. Cast of the inside of the hypostoma. The central portion
with the maculæ 3/1. Spec. V.
» 48. Inside of the right macula 12/1. Spec. Y.
From a quarry north of the gallows near Wisby.
Lichas latifrons Ang. p. 60.
Fig. 49. The right macula, transmitted light, seen from the inside
60/1. From Kyrkberget, Wisby.
Platymetopus planifrons Ang. p. 67.
Fig. 50. The hypostoma 1/1.
» 51. The left macula. Transparent lenses? 12/1.
From the Leptæna limestone of Dalecarlia.
Trochurus pusillus Ang. p. 70.
Fig. 52. The hypostoma 5/1.
» 53. The right macula in transmitted light. Seen from the inside
60/1. From Fröjel.
Trochurus? p. 70.
Fig. 54. The hypostoma 3/1.
» 55. The right macula from the inside 12/1. From När Gotland.
| K. Sv. Vet. Akad. Handl., Bd 34, No 8. | Lindström: Trilobites. Pl. IV. |
Click on image to view larger sized. | |
| G. Liljevall del. | Ljustryck af Chr. Westphal Stockholm. |
