KONGL. SV. VET. AKADEMIENS IIANDL. BAND. 19. N:0 6. 69 



5. Platyceras enorme n. 



Pl. II figs 59—72. 



Theca anceps 1859. Fii. Scumidt (neo Phillips) Geologie der Insel Gotland, Aroliiv Naturk. Estlands Bd II, 442. 

 Tlieoa sp. 1867. Likdsteöm Nomina, 23. 



Shell straight, cylindrical, with a diminutive spire of one and a half whorls. Many 

 specimens are curved as a crescent or a bow. The last whorl is considerably develo- 

 ped and large and the spire has dwindled to a mere appendage to it. In its general 

 shape the shell thus resembles a diminutive Lituite. The surface is covered by trans- 

 verse, sinuous striaä, the edges of which in the best preserved specimens project as thin 

 reflexed lamellge with smaller ones between them. Pl. II f. 72. These are intersected 

 by fine, longitudinal lines, interrupted by the transverse ones as seen in fig. 71. The 

 aperture, figs 66, 67, is oval or circular with thin lips, often sinuous or wavy. Length 

 17 millim., diameter at the aperture 8 millim. From the shale at Djupvik in Eksta 

 Rikvide in När, in the sandstoue of Bursvik, in the oolitic beds of Hafdhem, Näs and 

 Bursvik, and in the limestone beds at Hammar in Kräklingbo, Klinteberg and Länna 

 near Slite, from which last locality the Mineral Cabinet of the University of Upsala has 

 obtained specimens, collected by Professor P. T. Cleve. 



This species and the following belong to that group of the Platycerata, which 

 J. Hall has called Orthonychia and which is so prevalent both in the Devonian and 

 the Carboniferous limestone strata. 



6. Platyceras cyathinum n. 



PI. VII fig. 22. 



Shell conical, nearly straight without spire of whorls, rapidly increasing in width, 

 spirally twisted in two bends. Surface conceutrically striated by fine transverse lines 

 of growth and wrinkled in the same direction. Aperture circular with thin edges. 

 Shell thick, consisting of several strata, glossy, opaque with only faint traces of prisms. 



Length of the single specimen found 30 millim., breadth of aperture 20 millim., 

 at the apex 2 millira. 



Only one specimen has hithei'to been found in the Crinoidal limestone of Fol- 

 lingbo, 



This species is related to the Bohemian Capulus anguinus Barrande and kindred. 



Fam. Y. BELLEROPHONTIDtE Mac Coy. 



Shell glohular or discoid, symmetrical or slightly deviating from the discoid lilan, 

 aperture loidened with an angular slit in its dorsal or superior edge, forming hy conti- 



