KONGL SV. VET. AKADEMIENS HANDL. BAND. 19. N:0 6. 171 



with a brownish tint. In other specimens again there are very distinct bands of the 

 original colour left, transverse, at regular distances, broAvn on the white surface of the 

 shell, parallel with the sculptural lines. The aperture is circular and its rim not con- 

 tinuous, interrupted at the interior lower corner. Outer lip thin, the interior one with 

 a somewhat callous border, umbilicus narrow and deep, entirely open and defined along 

 its periphery by a low and narrow ridge, which inwards sinks perpendicularly and 

 meets the sloping funnel of the umbilicus. 



Dimensions: height 1.5 millim., breadth 18 millim. Aperture: high 11 millim., 

 broad 10 millim. 



From Samsugn in Othem, the canal near WestOOs, Halls huk, in the uppermost 

 stratum and from Wialmsudd. 



12. Oriostoma alatum n. 



PL XVI fig. 14—19. 



Shell disciform, whorls rather transversally dilatated, increasing rapidly in width 

 from the minute apex of three whorls. Whorls in all six. A narrow, laminar, sharp 

 edged keel divides the umbilical and the apical surfaces and thus gives the shell a 

 slight resemblance to Pleurotomaria alata and the allied species- But in this species 

 the laminar keel is solid and the transverse striaj continue in the same direction on 

 both sides of it. Parallel with the keel there run some five narrow, thread fine lines, 

 equally distantiated on the apical side and, likewise on the umbilical side, five, though 

 more indistinct. The transverse strife are distinct, rather coarse and regularly directed 

 backwards. The aperture is transverse, obovate, the outer lip on the middle of its 

 height thickened by the keel, else thin, the interior lip thin, only expanded and thicker, 

 where it joins the whorl. The umbilicus is wide and so open that all whorls are 

 seen inside it. Specim. A, h. 14 mill., br. 23 mill.; B, height 10 mill., br. 24 mill.; 

 sp. C, h. 14 mill., br. 44 mill. One specimen has been obtained from the middle li- 

 mestone strata near Wisby and three from the higher strata of Kyrkberget in Wisby. 



13. Oriostoma angulatum Wahlenberg. 



PL XX fig. 34—41. 



Helicites supnt-angulatus 1818. Wahlenberg Petref. TelL Sv., 72'). 



Helicites angulatus 1818. Id. ibid., 73. 



1828. His. Anteckn. IV. 237. 



Euomphaltis angulatus 1829. Id. Tableau ed. 1, 10. 



1831. Id. ib. ed. 2, 9. 



1831. Id. Anteckn. V, 114. 



1848. Bbonn NoraencL, 478. 



Inadius angulatus 1837. Hisinger Leth., 37, tab. XI L 12. 



1840. Id. Foiteckn., 55. 



1867. LiNDSTR. Nomina, 23. 



Euomph.? sapra-angulatus 1837. His. Leth., 37. 



1848. Bronx XoraencL, 482. 



StraparoUus angulatus 1850. D'Orb. Prodr., 30. 



') EiTore Helic. supragranulatus pro Hel. supraangulatus apud Bronn Xomenclator p. 57 2, 1848. 



