KONGL. SV. VET. AKADEMIENS HANOL. BAND. 19. N:o 6. 115 



former variety. The shell eoiisists of two strata of wliicii the interior one is smooth 

 and i^lussy. The aperture is obliquely ovate, hii^dier than broad and the umbilieus 

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

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

 Dimensions of the lower form: height 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 Carlso in the limestone 

 bods, in the shale beds at Wisby, Gnisviird, Westergarn and Stora Carlso. The elon- 

 gated furm is found in the limestone beds of Wisby, Likkershamn, in the canal near 

 Westoos in Hall, Samsngn in Othem, Lannaberget near Slite, Wialinsudd in Bunge, 

 Lutterhorn in Faro, Kalens Qvarn, Kristklint in the bay of Kapellshamn. 



Pleurotomaria erenulata Mac Coy, Palajoz. Fossils p. 291, pi. 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 Mukchison 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. vSoc. of London from the Aymestry Limestone at Aymestry. 



Mukchison says in the >'Postseript» to the paper on the Silurian Rocks of Sweden: 

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

 catus HisiNGEU.o This statement, even if the figure in the Silurian System did not 

 show the identity, must suffice to dispel the identification of this shell with Inaehus 

 costatus or centrifugus as Moiiuis 1. c. and BuuNN Nomenclator p. 478, have it. 



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

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



Divisio VI. ALAT^ 

 (Euomphalopterus F. Roemek.) 



27. Pleurotomaria replicata n. 



PI. XIII tig. 39—44. 



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

 band situated on the lower and exterior edge of the trigonal whorls, consecjuently directed 

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

 band winglike or expanded. Like that in PI. alata it is enormously w^idened, figs 

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

 whorl. The crescents closely set, elongated as lan)ella3, 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 exterior 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 



