122 



G. I.IN'D.STROM, ON TIIK SlIAIlilAN <iASTK01'()])A AND I'TKROl'ODA OK GOTLAND. 



is deepened, and thence havinrj a pitted aspect. The aperture is obliquely elliptical, 

 broader than high. The lips seem to have been thin, not reflexed. The umbilicus is 

 open and wide and all whorls are visible inside. 



Height 55 mill., breadth 1,1 decim. Body whorl near the aperture 52 mill, across. 



About eight specimens of this large shell have been found in the lower lime- 

 stone strata of Ostergarn and a smaller in the uppermost limestone of Linde klint. 



As the Sjteciniens found are mostly nuclei and only few traces or shreds of the 

 shell are left, there may be some doubt if this species belongs to Pleurotomaria. But 

 the direction of the transverse striaj seem to warrant such a supposition, even if there 

 is no certain evidence in the section of the very thin slit band lamella, pi. XI fig. 28. 



Divisio VII. PLANORBIFORMES. 



37. Pleurotomaria planorbis Hisinger. 



?1. XIX tig. 30—39. 



Turbiniten ceritrifngHs 1828. Hisingek (not Wahlenberg). Anteckn. IV, 221, 237, tal). VI f. 2. 



Helicites? ceutrifinjus 1828. lu. Ibid, in the explan. of the figures. 



Euomphnhis centrifufjus 1829. Id. Tableau, ed. 1, 10. 



1831. Id. Anteckn. V, 114, tab. 1 fig. d. 



1831. Id. Tableau, 9. 



1848. Bronn. Noraenlator, 478. 



1854. Morris. Catal. Brit. Foss. Sec. Ed., 247. 



1855. Mac Coy. Palaeozoic Fossils, 297. 

 1867. Salter, Siluria, 231, 531. 



1873. Id. Catal. Cambr Foss., 156, 172. 

 1876. Ferd. Roemer, Lethiea Geogn. Taf. 14 f. 13. 

 Enoiiiplmlns .mbstriatns 1829. Hisinger Tableau ed. 1, 11. 



1831. Id. Anteckn. V., 114. Tab. 1 fig. e. 



1831. Id. Tableau ed. 2, 9. 



1835. Hisinger, according to Bronn Leth. geogn. Ed. 1, Bd. 1, 97. 



1848. Bronn Nomenclator, 256. 



1837. His. Lethjea Suec, 38, tab. XII f. 1 a— c. 



Id. Forteckn., 55. 



LiNDSTR. Nomina, 29. 



QuENSTEDT Petrefaktenkunde Deutschlands le Abthcil. 7r Bd., 395, tab. 200 

 fig. 81. 



D'Orbigny Prodr., 30. 



Shell disciform, with five whorls, rapidly increasing in size in the following ratio. 



Body whorl 22 mill., in breadth. 



n » 



» » 



dentriftigtis planorbi 

 Inachus sulcatus 



1841. 

 1867. 

 1882. 



Straparollus sulcat>i$ 1850. 



The slit is at first large and broad and forms, where it ends, a narrow, acute 

 angle. It, as well as its continuation, the slit band, is situated on the apical side of 

 the shell, close to the suture as in the following species. It is eoniparativel}' nar- 

 row, elevated above the surface as a thin string and included only by the straight ed- 

 ges of the shell, though in a few instances there are obscure traces of bordering lines. 



