102 G. LINOSTKOM, UN THE SILUlilAN GASTKOl'ODA AND I'TEliOl'ODA OF GOTLAND. 



Wisne luyr in Fardlieiu, Osteryarn, Stor Myr in liutc, but also in the limestone beds 

 of FarO, Medebys in Hall, Wisby Kyrkberg, Djupvik in Kraklingbo. It very seldom is 

 found but in nuclei. In some instances the interior nacreous coating is retained as in 

 specimens from Ostergarn. 



PI. percarinata Hall Pal. N. Y. Vol. I p. 177 pi. 38 fig. 4 resembles somewhat 

 this species. 



13. Pleurotomaria dolium n. 



PI. IX fig. 1— :i 



Shell turbinated, rotundate, with the body whorl much in excess of the other 

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

 large, scoo|)ed out as to form a regular groove around the shell with somewhat out- 

 standing borders. The crescents arc regular, wide apart, with prominent lamellar 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 line trans- 

 verse lines, which are obliquely lamellar 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 lines. Suture very shallow. The aperture is 

 nearly circular, no umbilicus can be discerned. 



Height (i millim., breadth 5 millini., body whorl nearly 4 niillim. in length. 

 Apical angle 77 °. 



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

 to the smaller specimens of PI. Lloydii (PL VII tig. 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. 



PI. IX fig. 4—6. 



Shell turbinated, whorls five, 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 ur, 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 var}ing 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, lamellar stria' with thin, elevated edges and directed obliquely 

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

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



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

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

 the surface a more or less fine striation. 



