147 



densioribus et ex parte superiore in tubercula abeuntibus a dextra ad sinistram 

 convolutus major pulliis duarum spirantm. Tab. 32, Fig. 6. The other he 

 describes as Twrbinites striatus striis transversis, et in medio in duplicem papil- 

 larum seriem divisis a dextra ad sinistram convolutis major pullus unicte spira. 

 Tab. 32, Fig. 7. These fossils, he informs us, were obtained from the 

 mountains in the neighbourhood of Baden, in Switzerland. Hist. Lap. 

 Fig. Kc. p. 111. Two fossils of this species have also been described by 

 Scheuchzer, in his Physica Sacra, one of which seems to be entirely dif- 

 ferent from those of Langius ; but the other appears to resemble that of 

 Fig. 7. 



The representations above referred to are mere casts of this shel), 

 the shell itself not having been discovered until of late years. This dis- 

 covery was made by M. Denis Montfbrt, who discovered two species in 

 the mountain of St. Catharine, near Rouen. One of these he distin- 

 guishes as TurrHites tnberculata; the whirls of the spire being set with four 

 rows of tubercles, disposed in quincunx order. This shell appears to 

 have been in such a state of perfection as to allow of its form being 

 made out completely. It is regularly formed in a spire, the whirls of 

 which are projecting and articulated, the foliaceous sutures formed by 

 the edges of the septa being apparent. The opening of the shell is 

 nearly round; the columella flat, without any folds; and the septa per- 

 forated, nearly in the centre, by a syphon. The other species has the 

 whirls of the spire beset with short ribs, beneath which are two rows of 

 tubercles, and appears to resemble the fossil figured by Langius, Fig. 6. 

 Journal de Physique, SCc. de r l licrmidor, An 7. A cast of this rare and 

 extraordinary fossil is represented Plate X. Fig. 12, in the superior frac- 

 tured termination of which may be seen the traces of its foliaceous 

 sutures. 



