34 G. IJNnSTRÖM, ON THE SILITRIAN GASTROPOBA AND PTEKOPODA OF GOTLAND. 



scription of Gotland (Gottlantl, geognostiskt beskrifvet in Vet. Ak. Handl. 1826, p. 

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

 heen some years ago described and denominated by Waiilenberg in the inemoir which 

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

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

 »Mineralogisk Geografi» in German by the renowned chemist Fr. Wöiiler in 1826 the 

 eight Helicites and Turbinites determined by Wahlenberg are also enuraerated 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 cornutura. 

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

 thus changed to nine. In 1829 »Esquisse d'un Tableau des Pétrifications de la Svéde, 

 distribuées en Ordre Systématique» appeared, containing 11 species, the same as before with 

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

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

 Euoraph. costatus (a cephalopodous shell of the genus Trochoceras) and Turritella 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- 

 ningar», 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 centrifugus låter by Hisinger himself were declared to be identical. New figures, 

 good 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 Pala3ontological work, »Letha^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 erratura for Hisinger, was already published in 1836 under the title 

 »Icones petrifactorum Sueci», Fasc. I, tab. I — X., Ånimalia articulata et Mollusca Cepha- 

 lopoda». In the Lethasa he describes 13 species, to which are to be added one more, 

 from the »Supplementum Secundum» to the Lethasa 1840, thus making a total of 14 

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



Euomphahis cornu arietis = Oriostoma discors Sow. 



Eu. alatus = Pleurotomaria alata. 



Eu. cequilaterus = Pleurotomaria sequilatera. 



Eu. catenulatus = Oriostoma rugosum Sow. 



Eti. subsulcatus = Oriost. globosum Schloth. 



Eu. fmiatus = Oriost. sculptum Sow. & O. Roemeri n. 



Eu. supra angulatus = Oriost. angulatum Wahl. 



Inachus angulatus identical with the preceding. 



Inachus sulcatus = Pleurotomaria planorbis His. 



Turbo striatus = Cyclonema striatum. 



