34 G. LINDSTROM, OX THE SILURIAN GASTROPODA AND PTEROPODA OF GOTLAND. 



scription of Gotland (Gottland, gcognostiskt beskrifvet in Vet. Ak. Handl. 1826, p. 

 311). He enumerates 5 sp. of Helix (= Oriostoraa) and 4 of Turbo, of which 8 had 

 been some years ago described and denominated by Wahlenberg in the memoir which 

 further down shall be taken into due consideration. Himself he there only added 

 Turbo sp. and Turritella meaning nuclei of Murchisonias. In the translation of his 

 wMineralogisk Geografiw in German by the renowned chemist Fr. Woiiler in 1826 the 

 ei^ht Helicites and Turbinites determined by Wahlenberg are also enumerated on p. 

 228. In 1828 he published again in the fourth part of his »Anteckningar i Physik och 

 Geognosi)) the description of Gotland, which he gave in the Transactions for 1826, 

 almost verbally with only a few additions. Thus there is the first figure, tab. VI f. 

 3, delineated as well as the others by Prof. P. F. Wahlberg of Murchisonia compressa n. 

 and of Pleurotomaria planorbis His. tab. VI f. 2, then named as Turbinites centrifugus. On 

 tab. VI f. 6 there is under the name of Turbinites a variety of Platyceras cornutum. 

 Helix obvallatus had been removed from the Gotland fossils and the number of species 

 thus changed to nine. In 1829 "Esquisse d'un Tableau des Petrifications de la Svede, 

 distribuees en Ordre Systematiquew appeared, containing 11 species, the same as before with 

 addition of Delphinula funata Sow. (= Oristoma sculptum Sow. et others), D. subsuleata 

 His. (= Or. globosum Schloth.), Euomph- substriatus His. (Pleurot. planorbis His.), 

 Euomph. costatus (a cephalopodous shell of the genus Trochoceras) and Turj'itella cingu- 

 lata His. The names Delphinula and Euomphalus were then employed for the first time 

 by HisiNGER. In 1831 a new description of Gotland is given in the fifth part of ))Anteck- 

 nincfar», and we there again find the same eleven species as enumerated before. But 

 in fact there are only nine, as Euomphalus costatus is a Cephalopod and E. substriatus 

 and centrifufus later by Hisinger himself were declared to be identical. New figures, 

 wood for the time, were given of several of them. 



A new edition of »Esquisse d'un Tableau» was published in 1831 also with 11 

 species, the same as before. 



Hisingers greatest Palasontological work, wLetha^a Svecica», is commonly cited as 

 published in 1837. But it seems that a part of it, from a quotation of Bronn in Vol. 

 3 of his "Handb. einer Geschichte der Natur, Nomenclator Bd I, p. XLI", where Nilsson 

 is evidently an erratum for Hisinger, was already published in 1836 under the title 

 »Icones petrifactorum Suecias, Fasc. I, tab. I — X., Aniraalia articulata et Mollusca Cepha- 

 lopoda)'. In the Lethaja he describes 13 species, to which are to be added one more, 

 from the "Supplementum Secundum)) to the Letha^a 1840, thus making a total of 14 

 species, when Inachus costatus is excluded as a Cephalopod. These are as follows, viz. 



Euomphalus cornu arietis = Oriostoma discors Sow. 



Eu. alatus = Pleurotomaria alata. 



Ell. cequilaterus = Pleurotomaria tequilatera. 



Eu. catenulatus = Oriostoma rugosum Sow. 



Eu. subsulcatus = Oriost. globosum Sciilotii. 



Eu. funatus = Oriost. sculptum Sow. A 0. RoEMEni ii. 



Eu. supra angnlatus = Oriost. angulatum Waiii,. 



Inachus angulatus identical with the preceding. 



Inachus sulcatus = Pleurotomaria planorbis His. 



Tiirho stiiatits = Cycloneina striatum. 



