KONGL. SV. VET. AKADEMIKNS UANUL. BAND. 19. N:u 6. 35 



Tufritella cimjulata = Murcliisouia ciiigulatn p. j). 

 Turritclla altenuata = Murcliisouia atteiiiiata. 

 Pileopsis cornuta \ p, , 



r,., , . I — i .uvifccras cornutum. 



ril. sulcata 



Tlierc are in irality thus thirteen species described by Hisingek in the Lethiea, 

 when two out of the fourteen are identical with others and one, E. fuiiatus, comprises 

 two different s[)eeies. Nor has this number been increased in the last publications of 

 HisiNGEi;, in the sixth part of nAnteckningari) and in »F6rteckning ofver en Geognostisk 

 och Petrificat-Saniling fran Sverige och Norige», printed in 1811. There is, however, 

 the important corrections made that Turitella cingulata is considered to be a Pleuro- 

 tomaria and tliat Murchisonia comprcssa is separated from it and referred to sepai'a- 

 tely as "Stenkiirnor af Turritellor», Leth. pi. 12, fig. 6 b. 



In ))Die Petrefaktenkunde" by Sciilotiieim (1820) there is only one of the 

 the Gotland species described on page 162, Trochilites globosus, the type specimen of 

 which I have had occasion to examine through the kindness of Professors Beykicu 

 and Dames. It is the same that somewhat later was called Euom. funatus by Sowerby. 



Geokg Wahlenberg describes in his »Petriticata Telluris Svecaiuv", published in 



the "Acta Soc. Scient. Upsaliensis (1821), p. 68, Turbinites cornu arietis, which Sowerby 



had already called Euomphalus discors and further 



Turbinites alatus Wahl. is = Pleurotomaria alata. 

 Helicitts catenulatus (p. 72) is = Oriostoma rugosum. 

 Hel. supra angulatus is identical with 

 Hel. angulatus = Oriostoma angulatuin. 

 Hel. cequilaterus = Pleurot. requilatera. 



Hel. ohvallatns xoccurrit in Gotlandia rai'ius" = Pleurot. qualteriata p. p. ? 

 Hel. obvallatus Wahlenberg is difiFerent from PI. qualteriata. 



Wahlenberg thus described in all six species, which were later adopted by 

 Hisinger. 



Professor N. P. Angelin, when a student of the University of Lund, distributed 

 small collections of Gotland fossils under the title: »Museum pala^ontologicum sveci- 

 cums and a list of these is printed in the Danish »Naturhistorisk Tidskrift af Kroyer", 

 2'' Vol. 1838. Amongst the 50 species there mentioned, we find Euomphalus cornu 

 arietis (= Oriost. discors), but Angelin's specimens are Oriostoma Roemeri, Euomplial. 

 alatus His — Pleurot. alata and Littorina? striata n. sp. In the existing copies of the 

 »Museura» no specimens of the last species have been found and consequently the iden- 

 tity cannot be made out- In his works on the Palaeontology of vSweden Angelin has 

 not given any estimate of the numeric value of the Gastropoda. But he seems to have 

 mentioned as his opinion to Barrande *) that the Scandinavian Upper Silurian beds 

 were not so rich in these fossils as Bohemia, where Barrande then considered that he 

 had 200 species, a number which is now manifold increased. 



In his paper "On the Silurian Rocks of Swedenn ") Sir Roderick Murchison also 

 gave a sketch of the geology of Gotland. On page 29 he enumerates the following 

 nine species of Gastropoda, viz. 



') Parallcle entre les depots siluriens de Boheme et de Scaudinavie, p. 59. 

 -) Quarterly Journal, Geol. Society of London 1847, p. 29. 



