150 G. LINDSTKOM, ON THE 8ILUUIAN GASTKUPODA AND PTEliOPODA OK GOTLAND. 



umbilical side the striiu are still liner. The aperture is nearly circular, only widened 

 into a small angular wing in the superior corner. The outer lip is thin and narrow, 

 the inner lip strong, reflexed back towards the umbilicus and partially concealing it. 

 The columella is open for a little more than halt' its total length, solid towards the 

 apex. The shell which is thickest around the narrow but open axis, consists of two 

 distinct layers of whicli the interior one is dark and transparent, the exterior pale 

 and opaque. H. 26 mm., br. 88 mm. 



It occurs at Samsugn in Othem, from where some twenty specimens have been 

 found and also in the limestone of Lutterhorn in FarC, where a smaller and more 

 conical variety occurs. 



9. Trochus Kolmodini n. 



PI. XIV fig. 32—34. 



Shell elongated, acurainately conical, of six whorls, with slightly concave outline. 

 Tlie ornamentation consists in lines of growth regularly curved backwards and equally 

 distantiated, their edges elevated into a tine and sharp lamina. The interstices are 

 smooth. The umbilical side is flattened and tinely striated. An obtuse angle is formed 

 between it and the apical side. The suture is acutely impressed and deep. The aper- 

 ture is transversally elliptical, the outer lip thin and sharp, the inner lip folded back 

 and hiding the umbilicus. H. 1"2 millim., br. 10 mill. 



A single, but complete specimen has been obtained from the limestone of Stor 

 Wede in Follingbo. 



ft 



Divisio II. OARINATI. 



10. Trochus Dalli n. 



PI. XIV, fig. 18—21. 



Shell turbinated, ventricose, with live whorls, which are minutely and densely 

 striated. Along the middle of the whorls there are tAvo longitudinal ridges close to 

 each other, not much prominent, softly convex; the aperture is circular, outer lip thin, 

 inner lip reflexed along its entire length and hiding the umbilicus. The suture is 

 moderately deep. H. 13 mill., br. 15 mill. Specimen, flg. 21, is of a variety with 

 broader whorls. 



Several specimens have been found in the limestone of Kyrkberget in Wisby. 



11. Troclius Wisbyensis. 



PI. XIV fig. 35—43, 45. 



Shell of much variable shape, obtusely or elongately conical, with long tapering 

 spire, whorls six or seven, ventricose and broader than high. The ornamentation is 



