KONGL. SV. VEl. AKADEMIENS IIANDL. BAND. 19. N:o 6. 151 



also highly variable, transversally oblique lines running either uniformly as in fig. 36 

 and 39 or distantiated and elevated at their edjies into thin lamella?. In a longitudinal 

 direction there are in most specimens (fig. 36, 40) tAvo keels on both sides of the 

 middle of each whorl, much distant from each other. In others again, as specimen 

 fig. 39, there is only one ridge, the uppermost one, and in such as fig. 41, 43 there 

 are no less than three keels, a third placed just above the suture. A fourth is follow- 

 ing the outer edge of the umbilical surface, fig. 42. The aperture is transversally 

 oblongate, with thin lips, of which the inner one is reflexcd and hides the umbilicus. 

 H. 23 mill., br. 19 mill. 



From the limestone of Kyrkberget in Wisby, where many specimens have been 

 found, from Samsugn in Othem, from the limestone of Ar, and from Lutterhorn in Faro. 



12. Trochus lamellosus n. 



PI. XIV fig. 44, pi. XV fig. 52—54. 



This species differs from the preceding chiefly in the ornamentation. The trans- 

 verse lines are much distantiated and elevated at their edges to projecting laminfe. 

 At the suture they intercross with the pointed continuations from the stria? of the 

 next whorl. It has been found in the canal near Westoos in Hall. H. 12 mm., 

 br. 10 mm. 



Another extreme form of this species has been found in the limestone of Samsugn in 

 Othem by Professor P. T. Cleve, the only specimen of which belongs to the Mineral 

 Cabinet of the University of Upsala and has been delineated on plate XV fig. 52 — 54. 

 It is elongate, turriculate of seven whorls, which taper rather rapidly towards the 

 apex. On the body whorl there are two longitudinal keels as in the former, having 

 between them an excavated zone. The uppermost keel of the lower whorls is almost 

 hidden, coinciding with the suture and partially covered by the lowermost border of 

 the following whorl. There are distantiated, transverse lines running obliquely and by 

 being folded in projecting thin lamina? they form the keels. The aperture is obliquely 

 elliptical and the interior lip which is thin, nearly hides the umbilicus, of which only 

 a narrow slit is to be seen. The umbilical side is almost flat, covered hy densely set, 

 transverse, thin laminte. H. 13 mill., br. 9 mill. 



Divisio III. mCISI. 



13. TroclLus incisus n. 



PI. XIV fig. 22—31. 



Shell regularly conical of six gradually increasing whorls evenly sloping, with 

 slight concavity or even in some specimens of convex outlines. Body whorl ven- 

 tricose with the umbilical side moderately convex, a narrow slightly elevated keel 



