36 G. LINUSTROM, UN THE SILURIAN (iASTROPODA AND I'TEROroDA OF GOTLAND. 



Euonqj/ialit.s discoi'S, rugosus^ fimattis, sculptus, carinahiK, alatu.s (Pleurot. alata), 

 Turritelbi obsolcta, lifurchisonia eorallii, and Turbo corallii. The three hist lueiitioned 

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

 collections where MuRCiiisON and Verneuil in London and Paris have deposited 

 the fossils they brought home from Gotland. As to Evi. carinatus Sow. I liave through 

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

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

 maria limata, as the name PI. 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 Benierkuiigen 

 auf einer Reise in Schweden und Norwegen». He enumerates in all 10 s[)ecies: Euomph. 

 discors, riigosiis, funatus, carinatus, alatas, catentdatus, Turbo striatus, Turritella cingulala, 

 Murchisonia corallii and Natica inflata. 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. Roemkr 

 in "Versteincrungen des Harzgebirges'> tab. 7, tig. 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. inflata must stand as a 

 synonym to PI. spiratum. 



Friedricii Schmidt made his researches on the palaeontology and geology of Got- 

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

 "Beitrag zur Geologic der Insel Gotland" ^). He enumerates 22 species of Ptero- 

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

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

 Pholidops. Then there remain 20 species and they are: 



(Jonularia iSowerbyi = Con. cancellata SandB. 



Theca anceps = Platyceras enorme. 



Pileopsis cornnta I i„ . 



,, ,/ > = rlatvceras comutum. 



iValtca parva ] 



BellerophoH dilatatus *. 



Belleroph. aymestrensis *. 



Plcurotomaria articulata = ? Murchisonia ninniliforinis n. 



Murcliisonia cingtdata = M. compressa n. 



Turritella obsoleta *. 



Euompliaius catenulato off. * 



Euomph. sculptus = ? Oriostoma sculptum Sow. 



Kn.oiiiph. catenulatun = Or. tugosnm Sow. 



/uioinpli. funatus = Oriostoma i;loljosiim Scim.uth. 



Euomph. discors = Or. discors Sow. 



Inachus sulcatus = Pleurotom. planorbis llis. 



liKicli. (inijulatus = Oriost. angulatum. 



Turbo striatus His. = Cycloneiua striatum. 



Trochus helicites = ? Pycnouiphalus aculus. 



Troch. coelatulus M'CoY *. 



Capulus calyptratus Scurenk = Autodetus calyptratus. 



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

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



') Those marJicd * I have been unable to identify. 



