.Mr. J. Lycett on a new tpeoies of Pteroceras. 117 



Our esteemed associate informs me that he has now cancelled 

 his former name and substituted Aluria for the reception of many 

 of the winged shells of the Great Oolite hitherto described as 

 Rostellaria. 



The winged shells discovered in the oolitic strata of Europe 

 belong to the genera Pteroceras, Rostellaria, Chenopus, and it 

 may not therefore be uninteresting to make a few remarks on 

 the fossil species of these genera. Goldfussf and Minister 

 figured and described two species of Pteroceras, P. oceani and 

 P. conica, from the Kimmeridge and Portland stages of Germany, 

 and five species of Rostellaria, R. gracilis, R. subpunctata, R. se- 

 nt i carina ta, R. tenuisiria, and R. nodosa, from the lias, and two 

 species, R. bicarinata and R. spinosa, from the inferior oolite near 

 Pappenheim. 



Roemer % figured and described two species of Rostellaria, R. 

 costata and R. caudata, from the coral rag of Hanover. 



Koch and Dunker § described and figured one species of Che- 

 nopus, C. Philippi, from the inferior oolite, and two species, C. cin- 

 ;/iilatus and C. strombiformis, with Rostellaria nodifera, from the 

 middle oolites of North Germany. 



Prof. Deslongchamps || figured and described ten species from 

 the oolitic rocks of Calvados in Normandy, five of which, P. ves- 

 pertilio, P. ponti, P. sexcostata, P. musca, and P. incerta, are from 

 the Kimmeridge clay of Honfleur, and five, P. antractoides*, P. 

 vespa, P. balanus, P. retusa, and P. paradoxal, were obtained from 

 the great oolite of Ranville. This profound and accurate observer 

 found five species of Rostellaria in the lias and oolites of the 

 same region. R. trifida* ranges from the upper lias to the Kim- 

 meridge clay ; R. hamus* is common to the inferior and the great 

 oolite ; R. myurus is found in the inferior, and R. hamulus* and 

 R. cirrus* in the great oolite of Ranville. 



Prof. John Phillips if figured Rostellaria composita, R. bispi- 

 nosa and R. trifida* from the oolitic rocks of Yorkshire. 



Mr. John Lycett described in a paper read before the Mem- 

 bers of this Society and now published ft* five species of Rostellaria 

 from the inferior oolites of Gloucestershire, which he named 

 R. unicornis, R. simplex, R. spinigera, R. solida, and R. gracilis, to 

 which may be added three undescribed species from the shelly 

 freestone and oolite marl of Leckhampton. 



Messrs. Morris and Lycett will figure and describe twelve spe- 



t Petrefact. Germanise, tab. 169 and 1"0. 



% Versteineruugen des Oolithen-Gebirges. 



§ Versteineruugen des Nord-deutschen Oolith-gebildes. 



|| Memoires de la Socie'te' Linneenne de Normandie. 



if Geologv of Yorkshire, Part 1 . 



tt Ptog* oS of these Pro ceed i ngs. 



l2 



