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



to its chief mass the operculum consists of a compact, dull, gray limestone nearest 

 the outside, but the interior mass 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 tig. 25 pi. 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. 



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

 Carlso, Petesvik, Burge in Fardhem, at the canal from Wisne myr, Ejmunds a,, Slite, 

 Hall, Lutterhorn and Lansa on Faro, Hammar in Kraklingbo, in the limestone beds of 

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

 Lilla Carlso and Sandarfve kulle, Frojel. 



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 gegenwartigen kommt . . . mit der unter Num. h daselbst (in Rumph's 

 work) befindlichen valuata sulcata sehr genau uberein. 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 (angs) 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 Carlso. It 

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

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

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



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

 belongs to this species or not. 



5. Oriostoma glolbosum, var. sculptum Sowerby. 



PI. XVII fig. 41—42. 

 Nerititse majores, striati et juxta longitudinem spirarum quasi sulcati, Bromell 1738 Lithogr. Suec. p. 36. 



Delphimda funata 1829. His. Tabl. ed. 1, 10. 



1831. lu. Ibid, ed, 2, 8. 



1831. Id. Anteckn. V, 114. 



Euomphalus ftmatiis 1837. Id. Lethnea, 37, but not the figures pi. XI fig. 11, which are copied from Sower- 



by's E. funatus Min. Conch, pi. 450. 



1840. Id. Fortecku., 55. 



Euomphalus scuiptus 1839. Sow. in Sil. Syst., 626, pi. 12 fig. 17. 



1843. Morris Catal. Brit. Foss. 145. ' 



1848. Broxn Nomencl. 481. 



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



