KONGL. SV. VET. AKADEMIENS HANUL. BAND. 19. N:0 6. 115 



former variety. The shell consi.sts of two strata of vvhicli the interiör oiie is siiiooth 

 and glossy. The apertnre is obliquely ovate, higher than broacl and the unibilicus 

 narrow. In sonie, fig. 7, 8, the suture is very deep. The slit band is also plaeed 

 lower, than in the former, where it is elose to the suture on the smaller whorls. 

 Dimensions of the lower form: heiglit 32 milim., width 55 mill., height of aperture 

 15 millim. The elongated variety has in height 32 millim., breadth 35 mill., aper- 

 ture 21 mm. 



The shorter variety is found at Klinteberg and Lilla Carlsö in the limestone 

 beds, in the shale beds at Wisby, Gnisvärd, Westergarn and Stora Carlsö. The elon- 

 gated form is found in the limestone beds of Wisby, Likkershamn, in the eanal near 

 Westöös in Hall, Samsugn in Othem, Lännaberget near Slite, Wialmsudd in Bunge, 

 Lutterhorn in Fårö, Kålens Qvarn, Kristklint in the bay of Kapellshamn. 



Pleurotomaria crenulata Mac Coy, Palseoz. Fossils p. 291, pl. 1 K. f. 45, may 

 also be referable to this species, but I cannot be sure of it through the description 

 and figure alone. There cannot be any doubt left that this species really is the E. 

 carinatus of Sow. since Murchison says he also found it in Gotland and, above all, 

 since I have had occasion to see a cast of the original specimen of Sowekby in the 

 Mus. of the Geol. Soc. of London from the Aymestry Limestone at Aymestry. 



Murchison says in the »Postscript» to the paper on the Silurian Rocks of Sweden: 

 »Mr SowERBY is responsible for the E. carinatus, which is distinct from Inachus sul- 

 catus HisiNGER.» This statement, even if the figure in the Silurian System did not 

 show the identity, must suffice to dispel the Identification of this shell Avith Inachus 

 costatus or centrifugus as Morris 1. c. and Bronn Nomenclator p. 478, have it. 



I have been obliged to give this species a new name, as there already before 

 exists a Pleurotomaria carinata Sow. 1834, Mineral Conch. p. 247. 



Divisio VI. ALATJE 

 (Euomphalopterus F. Roemer.) 



27. Pleurotomaria replicata n. 



Pl. XIII fig. 39—44. 



Shell evolute, with lowly sunk spire, whorls three and a half, wide apart. Slit 

 band situated on the lower and exteriör edge of the trigonal whorls, consequently dii'ected 

 downwards towards the apical side, as usual with so many Pleurotomaria3 having this 

 band winglike or expanded. Like that in Pl. alata it is enormously widened, figs 

 42 — 43, into an aliform lamina, nearly as long across as the widest diameter of the 

 whorl. The crescents closely set, elongated as lamellse, directed outwards towards the 

 aperture. In a section across the band, fig. 43, more than twelve crescents may be seen 

 cut across. A section along the exteriör edge of the aliform band reveals, fig. 44, 

 the extreme, thin outlines of the much distantiated crescents. A section of the 

 whorls, fig. 39, gives the figure of a nearly isoscele triangle, the short basal line of 



