HORNES TERTIARY MOLLUSC .4. 19 



from the decomposition of granite, and resting on that rock. The 

 same stratum is also characterized by F. solarium, Lam., which con- 

 stitutes whole layers near Wiedendorf, in the environs of Krems. 

 The deposits of this locality are connected with those of Ortenburg 

 and Vilshofen (Bavaria), westward with those of Anjou and Tou- 

 raine, and eastward with those of Hungary and Asia Minor as far as 

 the plateau of Erzeroum. P. solarium is peculiar to the extra- 

 alpine portions of the Vienna basin, and characterizes a determinate 

 horizon in association with Cardium Kubecki, Hauer, and Pectuncu- 

 lus Fichteli, Desh. P. Burdigalensis (occurring only in the Hunga- 

 rian basin, near Promontor on the Danube) and P. palmatus, Lam., 

 from Gaudendorf, Eggenburg, Promontor, &c., also belong to the 

 same horizon. P. Beudanti, Bast., and P. Rollei, Horn., characterize 

 a somewhat higher series, and are extremely abundant in the Echinus- 

 beds of Gaudendorf. P. aduncus, Eichw., is highly characteristic of 

 the true Leithakalk and its sands ; it abounds especially north-west 

 of Vienna, and is associated with P. Tournali, Serres. Another 

 characteristic species of the Leithakalk is P. latissimus, Brocchi, 

 which is stated to occur in 27 localities in the Vienna basin. P. 

 Besseri, An dr., and P. Leitliajanus, Partsch, from the same deposit, 

 have a mdo extension. The Leithakalk and its equivalents range, 

 from west to east, from Perpignan to Asia Minor, and, north to 

 south, from Malta and the Morea to Upper Silesia. Probably they 

 exist also in Italy, as the fossils from Siena and Monte Mario, near 

 Rome, evidently correspond with species from the Vienna basin. 



Pecten Reussii, Homes, is similar in sculpture to P. Islandicus, 

 but cannot be identified with it or any other living species. P. suh- 

 striatus, D'Orb., which has been frequently identified with P. varius 

 or P. pusio, is regarded by the author as referable to a species re- 

 presented in the older Tertiaries of Antwerp, Touraine, and Turin, 

 and certainly not to P.jntsio. 



Pecten Malvince, Dubois, which was formerly referred to P. oper- 

 cularis, and P. elegans, Andr. (P. Sarmenticus, Goldf.), are also abun- 

 dant in the Leithakalk. 



Pecten septem-radiatus, Miill., P. cristatus, Bronn, P. duodecim- 

 lamellatus, Bronn, and P. sjnnulosus, Miinst., are either confined to 

 the Lower or Baden " Tegel," or are most abundant in that deposit. 

 The first-named species exists in the Mediterranean at the present 

 day ; the next two are extinct, but abound in the Italian Subapen- 

 nine deposits ; and the last, found rarely at Saubriques, near Dax, 

 and near Turin, is otherwise peculiar to the Vienna basin. 



The genus Hinnites is represented only by some young specimens 

 of H. Defrancei, Micht. 



Two species of Plicatida (P. mytilina, Phil., and P. ruperella, 

 Duj.) are met with in great abundance, especially in the marl-beds 

 beneath the Leithakalk. 



Of the Spondyli, S. crassicosta, Lam., is a characteristic species of 

 the Lower Neogene deposits of Europe, and especially of the Leitha- 

 kalk of the Vienna basin. 8. gaderopus, L., is a recent species 

 abundant in the Mediterranean ; and 8. Mioccenicus, Micht., occurs 

 at Lapugy, in Transylvania. [Coctnt M.] 



