KONGL. SV. VET. AKADEMIENS HANDL. BAND. 19. N:0 6. 141 



to the umbilictis than the exturior niargiii, on the inside of which a scooped out belt 

 is formed, being bordered by a Hharp edge where the umbilicus begins. The striation 

 on the surface is only transversal, slightly bent in a sinus where it crosses the keel. 

 The striae are narrow, elevated and thread like. The aperture is transversally ovate, 

 the umbilicus rather narrow. II. (! mm., br. 17 mm., diameter of umbilicus 5 mm. 

 Another specimen: H. 5 mm., br. 11 mm., umbilicus 3 mm. Two specimens from the 

 shale of Wisby. From Dalhemsa, near Nya Slitegards, the museum possesses a single 

 specimen, which [)erliaps is only a variety of this species. It is, however, different in 

 not having the inferior keel so prominent and the whorls are convex, not flat between 

 the keel and the suture. On the undjilical side it is more conformed to the former. 

 The shape and sculpture of E. pr;ecursor remind of the far larger species from 

 younger paheozoic formations. 



5. Euomplialus Walmstedti n. 



PI. XVIII fig. 12—14. 



Shell discoid, spire on a level with the body whorl, whorls seven. On the 

 apical side a blunt ridge is running longitudinally and the surface of the whorl inside 

 it and the suture is slojiing towards the suture or even a little scooped out. The 

 median line of the whorl, on the dividing line of the apical and umbilical side, is 

 obtusely carinated. A little inside the longitudinal axis of the umbilical side there is 

 a sharp, narrow keel, from which the side slopes gently inward. A narrow, sharply 

 defined groove marks the suture on the umbilical side. The transverse striation, the 

 only one extant, is extremely fine and the stria; are slightly angulated when cro.ssing 

 the inferior ridge. The aperture is transversally ovate, angulated, the umbilicus wide 

 and open. H. 4 mm., br. 13 mm., umbilicus 4 mm. Several specimens have been 

 obtained from the red limestone of Sandarfve kulle. There are also specimens from 

 Samsugn in Othem and Klinteberg, which probably are oidy varieties of this species. 

 They have the whorls more rounded and the keels blunt or nearly evanescent. The 

 wider umbilicus and the conformation of the whorls around it, as well as the quite 

 different striation, distinguish this species from the former. 



Gen. LOXONEMA Phillips. 



1841 Lv.vouema Puill. Pala;ozoic Foss. Cornwall, p. 98. 



Shell turriculate, loith loiu/, slender spire of ventricose wItorU; a shallow indenture 

 occurs in the exterior lip of the aperture. The lines of </roicth and also the ornamental 

 ones are bent in an obtuse angle, the apex of lohich is situated in a line with the apcr- 

 tural indentation. The axis is solid and the oldest whorls are filled with an organic 

 deposit of homogenous calcite as in the preceding genus. 



