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.
Cyrtometopus clavifrons Dalm. p. 49.
Fig. 17 & 18. Horizontal sections of cephalic eyes 60/1.
» 19. Vertical sections of cephalic eyes and a part
of the cheek 20/1.
» 20. A highly magnified portion of the eye in vertical section
60/1.
» 21. Hypostoma, 3/1 the anterior wings completed after another
specimen. From Östergötland.
Cyphaspis elegantula Angelin p. 52.
Fig. 22 & 23. Horizontal and Vertical sections of cephalic eyes 60/1.
Diameter of facets 0,03 mm.
» 24 & 25. Hypostomas from the front side and
in side view 8/1. Upper Silurian, Gotland.
Ctenopyge pecten Salter p. 29.
Fig. 26. The head shield, the free cheeks added from other
specimens 4/1.
» 27. A free cheek, viewed without foreshortening, as in its
natural position 4/1. Alumschists of Andrarum, Scania