KONGL. SV. VIOT. AKAlJKMIENS IIANDI,. BAND. 19. NU) 6. 119 



few specimens of PL alata, fig. 28, which also show a very faint rib nearly on the same 

 place as in the variety. Height 8 millini.; breadth 16 mill. 



From Djnpvik in Eksta, Lingsarfve in Nas, Faro, Westergarn and in ihc oolitic. 

 limestone of Bursvik. 



30. Pleurotomaria alata var. opposita n. 



PI. X. tig. 38—40. 



Shell trochiform, broader than high, spire of live or six Avhorls, more ventricose 

 than in the preceding varieties of the species. Slit band situated a little above the me- 

 dian line of the whorls. Beneath the band, near the suture, a narrow keel is seen and 

 there is none around the umbilicus. This variety is best distinguished by the direc- 

 tion of the transverse striaj, which, as seen in tig. 39, are more prominent and elevated 

 than in the others and are obliquely turned against the aperture, quite oppo.site to 

 what obtains in most of the other Pleurotomariaj. The ends of the larger stria' radiate 

 in an expanded brush of minute strife, fig. 40. In the preceding forms the stria? meet 

 the slit band cither rectangularly or directed backwards. Height 7 mill., breadth l.'» mill. 



From the shale at Petesvik in Habblingbo. 



31. Pleurotomaria prsetexta n. 



PI. XI tig. 1—7. 



Shell trochiform, moderately elongated, with six whorls, which are convex and 

 evenly rounded below, the umbilical side almost flat. The keel formed by the slit 

 band is broad, near its junction with the whorls on both sides ornamented with a 

 strongly prominent, spiral ridge, on which the transverse strite form nodules. The band 

 is placed a little above the mt^lian line of the body ^vhorl and on tlic (.ther whorls 

 high up, close to the suture. As seen in fig. 5 its interior cresccntic lamelhv are ver}' 

 closely packed, elongated and reach obliquely forwards to the margin of the keel. Tiiis 

 margin, fig. 6, is sometimes folded in a number of small wavelets, nearly as in 

 PI. undulans though more regularly. The transverse striae of the surface are ap- 

 proached, although at regular distances, and have some smaller, parallel ones in the 

 interstices. The aperture is circular and a little angular in its interior corner and the 

 un\bilicus open and narrow. Height 13 mill., breadth 16 mill, aperture 6 millim., um- 

 bilicus 3 millim. 



Occurs in the lowest shale beds near Wisby. 



This species is nearly related to PI. alata, from which it is r(>adily distinguished 

 b}- the elevated ridges near the edge of the slit band. 



32. Pleurotomaria togata n. 



PI. XI lig. 8—1.3. 



Shell trocliiform of seven angular whorls, slit l)an(l thick and short, fig. 13, 

 placed above the median line ol the body whorl and close below the suture in the 



