This species has the maculæ placed near the posterior border, in a semilunar flat, devoid of the terrace-lines. The maculæ are elongated tubercles and do not show any structure when sectioned. The cephalic eyes have a thin membrane covering the short cupshaped lenses, which, closely packed, in the transverse section give the usual polygonal mosaic of hexaeders. They have a radiate structure, when decayed. _D. ladogensis_ HOLM. Pl. III figs. 57, 58. A specimen from Öland has the maculæ lying in the large field of terrace lines above the smooth zone at the posterior margin of the hypostoma. They are larger than in the former species, pearshaped, smooth and no structure visible. =Encrinurus= EMMR. I cannot find any former figure indicating the maculæ of the hypostoma in this genus than the only one of ANGELIN, Pal. Scand. pl. IV fig. 6. As to the shape of the singularly formed hypostoma in the three Swedish species Encr. punctatus, obtusus and lævis we have found the anterior border so characteristic in them that it is sufficient to distinguish them from each other and to annul the doubts concerning the distinction of Encr. lævis from Encr. punctatus. We therefore in pl. IV figs. 12-17 give the anterior margins of these three species, along with the profiles. _Encrin. punctatus_ WAHLENBERG. Pl. IV figs. 5-9, 12, 13. The surface of the hypostoma is so finely and obscurely granulated that it seems to be almost smooth. It is in the shallow groove above the lamellar tongueshaped posterior border that the elongated tubercular macula are situated. They are prominent and in horizontal sections they have a surface mottled by irregular black and white specks, the whole surrounded by a white border, fig. 6. This border and the other surface is pierced by series of parallel slitlike pores, fig. 7, a feature peculiar to this genus. The vertical sections indicate a chain of indistinct prisms with a black, rounded central hollow between thick strata of clear whitish shell substance, figs. 8, 9. The shell substance on the sides is pierced by the straight, black tubes. The cephalic eyes have the prisms indistinctly developed or badly preserved with a diameter of 0,04 millim. and height of 0,07 millim. In Encr. lævis the prisms are more distinct and larger with a diameter of 0,00 millim. (pl. IV figs. 10-11). The maculæ are well developed, ovate, in E. lævis and obtusus and in the same position as in E. punctatus. =Griffithides= PORTLOCK. The hypostoma of Griff. globiceps PHILL. shows according to the figure given in H. WOODWARD'S work pl. VI fig. 5 two somewhat obscure maculæ, but no mention is made of them in the description. =Harpes= GOLDF. _Harpes d'Orbignyanus_ BARR. NOVÁK II Taf. I fig. 4, with small black maculæ. Harpes venulosus CORDA. NOVÁK II, Taf. I figs. 1, 2. Two narrow, horizontally placed maculæ. =Harpina= BARR.