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



171 



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

 original colour left, transverse, at regular distances, brown 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 interiör lower corner. Outer lip thin, the interiör one with 

 a somewhat callous börder, uinbilicus 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 uinbilicus. 



Dimensions: height 15 millim., breadth 18 millim. Aperture: high 11 millim., 

 broad 10 millim. 



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

 stratum and from Wialmsudd. 



12. Oriostoma alatum n. 



Pl. XVI fig. 14—19. 



Shell disciform, whorls rather transversall}" dilatated, increasing rapidly in width 

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

 edged keel divides the urabilical 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 strias continue in the same direction on 

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

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

 more indistinct. The transverse strite 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 interiör lip thin, only expanded and thicker, 

 where it joins the whorl. The uinbilicus 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 Wahlenbeeg. 



Helicites supra-angulatus 1818. 



1818. 



1828. 



1829. 



1831. 



1831. 



1848. 



1837. 



1840. 



1867. 

 EuomphJ supra-angulatus 1837. 



1848. 

 Straparollus angulatus 1850. 



Helicites angulatus 

 Euomphalus angulatus 



Inachus angulatus 



Pl. XX fig. 34—41. 



Wahlenbeeg Petref. Tell. Sv., 72 1). 



ID. ibid., 73. 



His. Anteckn. IV, 237. 



Id. Tableau ed. 1, 10. 



ID. ib. ed. 2, 9. 



Id. Anteckn. V, 114. 



Bronn NomenoL, 478. 



HisiNGER Leth., 37, tab. XI f. 12. 



Id. Förteckn., 65. 



LiNDSTR. Nomina, 23. 



His. Leth., 37. 



Bronn Nomencl., 482. 



D'Orb. Prodr., 30. 



') En-ore Helic. supragrayiulatus pro Hel. supraangulatus apud Bronn Nomenclator p. 5 72, 1848. 



