102 G. LINDSTRÖM, ON THE SlLUItlAN GASTKOPODA AND l^IEKOPODA OF GOTLAND. 



Wisne myr in Fardlieni, Otitergarn, Stor Myr in Rute, but also in the limestone beds 

 of Fårö, Medebys in Hall, Wisby Kyrkberg, Djupvik in Kräklinybo. It very sulduni is 

 found but in nuclei. In sonie instunces thc interiör nacreous coating is retained as in 

 specinicns from Ostergarn. 



1'1. percarinata Hall Pal. N. Y. Vol. I p. 177 pl. 38 iig. 4 resemblus somewhat 

 tliis species. 



13. Pleurotomaria dolium n. 

 ri. IX fig. 1—3. 



Shell turbiiiated, rotundate, Avitli the body whorl inuch in excess of the other 

 three whorls. Slit band situated a little below the middle line of the body whorl, 

 large, scooped out as to form a regular groove around the shell with somewhat out- 

 standing borders. The crescents are regular, wide apart, with prominent lameilar edge 

 and smooth interstices. The ornamentation above the band consists in two or three 

 obtuse longitudinal ridges, a little nodular where they are crossed by the iine trans- 

 verse lines, which are obliquely lameliar near the slit band. Beneath this band there 

 is only a single sharpedged ridge, halfway between the band and the suture, and 

 oblique, closely set, narrow, transverse liues. Suture very shallow. The aperture is 

 nearly circular, no umbilicus can be discerned. 



Height 6 millim., breadth 5 millim., body whorl nearly 4 millim. in length. 

 Apical angle 77 °. 



Only one specimen has been found in the sandstone of Bursvik. It coraes near 

 to the smaller specimens of Pl. Lloydii (Pl. VII fig. 43, 44) but is easily distinguished 

 through its broad slit band, its want of umbilicus and the form of the whorls. 



14. Pleurotomaria laqueata n. 



Pl. IX fig. 4—6. 



Shell turbinated, whorls tive, ventricose. The slit band more than a millimeter 

 in breadth, convex, is situated a little beneath the median line of the whorls, orna- 

 mented with laminated or, as it were, imbricated crescents. It is bordered by two 

 sharp edged lines, one on each side, and with jagged outside. On each side of this 

 band there is a varying number of parallel, elevated, longitudinal ridges. In one 

 specimen there is only one beneath the band and one above. In another specimen 

 there are three ridges above the slit band and one below. All these ridges are cros- 

 sed by transverse, lameilar striaj with thin, elevated edges and directed obliquely 

 against the slit band, which they do not cross. Suture shallow. The aperture is oval 

 with the columellar lip thick, reflexed, without any umbilicus. 



There is some variation as to the distance and number of the transverse stria3, 

 which lie imbricated with lameilar edges and through their varying position giving 

 the surface a more or less line striation. 



