KONGL. SV. VET. AKADEMIENS HANDL. BAND. 19. N:0 6. 147 



2. Trochus fulminatus n. 



Pl. XIV fig. 12—13. 



Sliull small, broadly conical with live ventricose whorls uiid deep suture. The 

 ornainentatioii is peculiar and characteristic. The distaiitiated, transverse lines are a 

 little below the middle of the whorls suddenly bent in aii obtuse angle, tlius fonuing, 

 as it were, a lower field of striaj on the belt next above the suture. The aperture is 

 transversally obovate, the lips thin, the umbilicus closed and the central part of the 

 uinbilical face deeply depressed and surrounded by a low ridge. H. lU uiillim., 

 br. 10 tuin. 



A few speciraens of this characteristic little shell have been found in a white 

 crystalline limestone north of Wisby, along the shore of Westkinde and Luuimelund. 



3. Trochus mollis n. 



Pl. XIV tig. 14—17. 



Shell large, broadly conical, of six tuniid whorls, which are only obtusely cari- 

 nated between the apical and the uuibilical surfaces. The sculpture differs totally 

 from that of the preceding ones and consists only in microscopically minute, transverse 

 stria3, very regularly distantiated from each other. The aperture is obliquely elliptical, 

 the outer lip thin and sharp, the interiör lip strongly reflexed or thickened. The 

 umbilicus is almost hidden through it and is only discerned as a narrow slit. 



H. 21 millim., br. 27 millim. 



Some specimens have been found in the limestone of Klinteberg and Samsugn, 

 and also in Lilla Carlsö, from where the Mineralogical Museum of Copenhagen has 

 obtained a specimen. 



4. Trochus Stuxbergi n. 



Pl. XIV fig. 59—69. 



Shell small, obtusely conical of tive or six whorls, which are ventricose, most 

 tuiuid near their inferior edge and the sides above nearly vertical. The ornamentation 

 consists of sigmoid, obliquely transverse, larainar striaj. The umbilical and the apical 

 sides are separated through a horizontal ridge, the extreme, thin margins of which are 

 much broken and jagged and are left behind in their old place on the older whorls, 

 having coalesced with the shell. The thin edges of this ridge form an upwards direc- 

 ted rim around the umbilical surface giving it a saucer-shaped appearance, elevated in 

 the centre around the narrow, but completely open umbilicus. The aperture is circular 

 or obovate, fig. 59. The outer lip is, when entire, thin, but thickens towards its upper- 

 most corner, where the horizontal ridge is situated. H. 11 mill., br. 13 mm. Another 

 specimen h. 7 railL, br. 9 mill. 



