36 G. LINDSTRÖM, ON THE SILURIAN (.ASTROPODA AND PTEKOPODA OF GOTLAND. 



Euomplialus discors, rugosus^ funatus, scidptus, carinatus, alatus (Pleurot. alata), 

 Turritella ohsoleta, Murchisonia corallii, and Turbo corallii. The three last rneritioned 

 I have not been able to identify, as they have not been found in any one of the 

 collections where Murchison and Verneuil in London and Paris have deposited 

 the fossils they brought honie from Gotland. As to Eu. carinatus Sow. I have through 

 casts of the original specimens, received from Dr J. G. Hindb, ascertained that it is 

 identical with the Gotland fossil described further down under the name of Pleuroto- 

 maria limata, as the name Pl. carinata was already before preoccupied. 



G. VON Helmersen visited Gotland on a Geological tour in 1845, but it lasted till 

 1858 before he published a memoir on his observations, entitled»Geologische Bemerkungen 

 auf einer Reise in Schweden und Norwegen». He enumerates in all 10 species: Euomph. 

 discors, rugosus, funatus, carinatus, alatus, catenulatus. Turbo striatus, Turritella cingulata, 

 Murchisonia corallii and Natica infiata. Of all these the last from Klinteberg is the only 

 addition to those former known. He does not mention the author of that species, but it 

 is likely that he thereby intended to designate a species described by F. Ad. Roemer 

 in »Versteinerungen des Harzgebirges» tab. 7, fig. 8. Of all species found on Klinte- 

 berg there is none but Platyceras spiratum which comes near to Roemers species, though 

 this is many times larger. I. think then that Helmersens N. infiata must stånd as a 

 synonym to Pl. spiratum. 



Friedrich Schmidt made his researches on the pahneontology and geology of Got- 

 land in 1858 and published the results during the following year in a pamphlet, entitled 

 »Beitrag zur Geologie der Insel Gotland» ^). He enumerates 22 species of Ptero- 

 poda and Gastropoda. But his Euomph. cornu arietis must be removed, as he also 

 mentions E. discors and his Patella sp. has since been found to be identical with 

 Pholidops. Then there remain 20 species and thej' are: 



Conularia Sowerbiji = Con. cancellata Sandb. 



Theca anceps = Platyceras enorme. 



Pileopsis cornuta 1 -ni i. j. 



T.r ,/ > ^ rlatyceras cornutura. 



Natica parva ] •' 



Bellerophon dilatatus *. 



Belleroph. aymestrensis*. 



Pleurotomaria articidata = ? Murchisonia moniliformis n. 



Murchisonia cingulata = M. compressa n. 



Turritella obsoleta *. 



Euomphalus catenulato aff. * 



Euomph. scidptus = ? Oriostoma soulptum Sow. 



Euomph. catenulatus = Or. nigosum Sow. 



Euomph. funatus = Oriostoma globosum Schloth. 



Euomph. discors = Or. discors Sow. 



Inachus sidcatus = Pleurotom. planorbis His. 



Inach. angidatus = Oriost. angulatum. 



Turbo striatus His. = Cyclonema striatum. 



Trochus helicites = ? Pycnoraplialus acutus. 



Troch. coelatulus M'Coy *. 



Capulus cahjptratus Schuenk = Autodetus calyptratus. 



BiGSBY gives in his Thesaurus Siluricus, 1868, in the lists of Gastropoda some 

 Gotland species, which he copied from former authors. He has in all 30 species 



^) Those marked * I have been unable to identify. 



