We give a new figure of BRÖGGER'S original specimens, as his figure 23, Tab. II is incomplete and incorrect. The maculæ are situated a little higher up on the sides of the central gibbosity. =Megal. planilimbata= ANG. Pl. V fig. 8. The maculæ are crescent-shaped and not so prominent as in Meg. attenuata and the visual spot in the same position as there. To observe is that the general structure of the hypostomic shell in this and many other species is prismatic. =Nileus= DALMAN. Hypostoma with maculæ figured in N. armadillo by ANGELIN pl. XVI fig. 5 c, and BR. II pl. 3 fig. 40. The hypostoma in this genus is transversal with large lateral expansions, the central convexity only faintly elevated and almost coherent with the posterior part. The maculæ lie exactly on the horizontal median line of the hypostoma. The anterior wings are well developed like slightly bent acuminated horns and the posterior wings are conical points. The terrace lines are transverse and a little wavy. =Nileus armadillo= DALM. Pl. V figs. 10-15. There is some variability in the hypostoma of specimens from different localities. The most known and numerous specimens are from the renowned localities of Östergötland. They are decidedly transverse, the proportion of the hight to breadth is as 3 to 5 and the narrow border runs all round. In specimens from Kongslena, Vestergötland, the proportion is as 15 to 22, in specimens from Sandvik, Öland, again, we have 13 to 23 or 6 to 11. The maculæ, fig. 14, are oblong, inwardly pointed, quite smooth, with a little concavity in their centre, and their surface is slanting obliquely towards the surface of the hypostoma, almost as in Niobe. There is no trace of any structure. The cephalic eyes are covered by a comparatively thick membrane, a direct continuation of the general test, fig. 12, hiding a row of prismatic lenses. In some specimens elongate, clear, crystalline rods continue downwards from the bases of the lenses and are probably nothing but inorganic crystals of calcareous spar, fig. 11.--The eyes are larger comparatively than in other species. =Nileus (Symphysurus) palpebrosus= DALMAN. Pl. V figs. 16-18. As to its general form the hypostoma resembles that of the preceding species, but there is no border line, which is so characteristic to the former. The maculæ have the same form and are likewise situated on the median line. The cephalic eyes have prismatic lenses with much convex bases, in a transverse section they are hexaedral and of internal radiate structure. =Niobe= ANGELIN. The following figures have formerly been given of its hypostoma with maculæ. _N. emarginula_ BR. II tab. 2 fig. 33. _N. explanata_ BR. II tab. 2 fig. 35. _N. frontalis_ BR. II fig. 37. _N. insignis_ BR. I tab. IV fig. 1 d, 11 tab. 2 fig. 28. _N. læviceps_ BR. II pl. 2 fig. 34.