150 G. LINDSTRÖM, ON THE SILUHIAN GASTKOruDA AND VTEUOrODA OF GOTLAND. 



umbilicul side tlie striiu are still iinur. The aperture is nearly circular, only wideiied 

 iiito a small angulai- wing iii tlie su|jei-ior conier. The outer lip is thin and narrow, 

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

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

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

 distinct layers of which tlie interiör one is dark and transparent, the exteriör påle 

 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 Fårö, where a smaller and more 

 conical variety occurs. 



9. Troclius Kolmodini n. 



Pl. XIV fig. 32—34. 



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

 The ornamentatiou consists in lines of grovvth regularly curved backwards and equally 

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

 smooth. The umbilical side is flattened and finely 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. 12 millim., br. 10 mill. 



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

 Wede in Follinjjbo. 



'fe- 



Divisio II. CARINATI. 



10. Trochus Dalli n. 



Pl. XIV, fig. 18—21. 



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

 striated. Along the middle of the whorls there are two 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 raill. Specimen, fig. 21, is of a variety with 

 broader whorls. 



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



11. Troclius "Wisby ensis. 



Pl. 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 ornamentatiou is 



