162 G. LINDSTRÖM, ON THE SILURIAN GASTROPODA AND PTEROPODA OF GOTLAND. 



to its chief mäss the operculum consists of a compact, dull, gray liraestone nearest 

 the outside, but the interiör mäss is converted into clear, crystalline calcareous spar 

 and distinct lines in this indicate special strata of growth of which it is made up. 



As seen in fig. 25 pl. XVII thin and narrow coils are alternating with larger 

 and the partitions are more deeply cut, than in any of the other forms of opercula 

 and the lobes directed vertically. 



O. globosum has been found in the shale beds of Wisby, Westergarn, Stora 

 Carlsöj Petesvik, Burge in Fardhem, at the canal from VVisne myr, Ejmunds å, Slite, 

 Hall, Lutterhorn and Länsa on Fårö, Hammar in Kräklingbo, in the limestone beds of 

 Gothemshammar, Ganthem, Rute, Wialmsudd, Samsugn, Martebo, Hörsne, Klinteberg, 

 Lilla Carlsö and Sandarfve kulle, Fröjel. 



The operculum has been found in the shale of Wisby, FoUingbo, Sandarfve kulle, 

 Eksta (Djupvik), Westergarn, Linde klint and Slite. 



It seems that this common and widely spread shell has been first described by 

 Walch as cited above, when he writes »Von der versteinten valuata sulcata des Rumphs.» 

 »Das Original des gegenwärtigen koramt . . . mit der iu)ter Num. 5 daselbst (in Rumph's 

 work) befindlichen valuata sulcata sehr genau iiberein. Das Petrefact ist aus dem 

 Mecklenburgischen, weiss von Farbe und hart versteint». The accompanying figure may 

 well be accepted as representing Or. globosum. Through the liberality of Professors 

 Beyrich and Dames of Berlin I have had for inspection the very original specimen of 

 Schlotheim's Trochil. globosus, which is kept along with his other collections in the 

 Museum of the University of Berlin. On the original label is written »aus Gothland 

 in Uberg (ängs) Kalkstein». It is badly preserved, to a great part imbedded in the 

 rock, a ball of limestone from the shale beds, possibly of Wisby or Stora Carlsö. It 

 belongs to a variety with only few keels on the umbilical side and the transverse striaä 

 much distantiated. It is indeed quite the same which låter by Sowerby was named E. 

 funatus, which name, although long used, must give way for the older of Schlotheim. 



I cannot decide whether Euomph. funatus Eichwald Leth. rossica I, 2 p. 1152 

 belongs to this species or not. 



5. Oriostoma globosum, var. sculptum Sowerby. 



Pl. XVII fig. 41—42. 

 Nerititse majores, striati et juxta longitudinem spirarura quasi suloati, Bromell 1738 Lithogr. Sueo. p. 36. 



Belphinula fuiiata 1829. His. Tabl. ed. 1, 10. 



1831. Id. Ibid. ed, 2, 8. 



1831. Id. Anteckn. V, 114. 



Euomplialus funatus 1837. Id. Lethsea, 87, but not the figures pl. XI fig. 11, which are copied fi-om Sower- 



by's E. funatus Min. Conch. pl. 450. 



1840. Id. Förteckn., 55. 



Euomphalus saulptus 1839. Sow. in Sil. Syst., 626, pl. 12 fig. 17. 



1843. Morris Catal. Brit. Foss. 145. 



1848. Bronx Nomencl. 481. 



1854, Morris Catal. Brit. Foss., 248. 



