462 Reviews — Notes on the Erratic Stones of Overyssel. 

 On a Sirenian from the Paris Basin. By Prof. A. Gaudrt. 



II. — SUR UN SiRENIEN d'esPECE NOUVELLE TROUVE DANS LE BaSSIN 



DE Paris. Par Albert Gaudrt. Bull, de la Soc. Geol. de 

 France, Z^ s. t. xii. p. y72, pi. xvii. 



IN the cuttings for a new line of railway on the outskirts of Paris, 

 which laid bare the shelly marls forming the base of the 

 Fontainebleau sands, there were discovered in one spot, confusedly 

 intermingled together, 14 ribs of a species of HaUtherium, which, on 

 account of their larger proportions and greater relative thickness, the 

 author regards as distinct from the ordinary species of the Paris 

 basin, H. Schinzi, Kaup. ; and he has therefore proposed a new name 

 for it, HaUtherium C'houqiieti. The exterior contour of one of the 

 ribs measures only -52 m., and yet it has an average circumference of 

 •20 m. and a thickness of '059 m. Fragments of ribs, of apparently 

 the same species, from deposits of the same age at Belleville, have 

 been for many years in the Museum at Paris ; and similarly massive 

 ribs are also known from the Lower Miocene of Cenon (Gironde). 

 The author further states that the ribs of Bliytina and of Bhytiodus 

 are much more elongated and proportionally thinner and more 

 delicate than those of H. Choiiqueti. G. J. H. 



Notes on the Erratic Stones of Overyssel, By K. Martin, 



Professor of Mineralogy, etc., at Leiden. 

 III. — Aanteekeningen over erratische gesteenten van Over- 



iJSSEL, door K. Martin, Hoogleerar in de Mineralogie, etc., 



te Leiden. (Zwolle, 1883.) 



IN the museum of the small town of Zwolle, on the eastern side 

 of the Zuider Zee, a collection has been formed of the various 

 erratic rock fragments found in the Province of Overyssel, and Dr. 

 Martin, in this paper, briefly calls attention to the unusual variety 

 of the fragments, and the widely separated districts from which they 

 have been transported by ice and mingled together in the drift 

 deposits of this district. The list comprises Granite and Gneiss, 

 probably from Sweden ; Limestone with characteristic Silurian fossils 

 from Gotland and the Russian Baltic provinces ; Devonian Spirifer 

 Sandstone (very abundant) from the Ehine district near Coblenz ; 

 Carboniferous Limestone fi'om Belgium, in the vicinity of Aix-la- 

 Chapelle ; a specimen of Goniatifes sphcBricus, probably from tlie 

 valley of the Euhr ; Ti-ias with Ceratites nodosus from North- West 

 Germany ; Lias, also probably from North- West Germany ; Dogger 

 and Malm from the Ehine districts ; Flints with Chalk fossils from 

 North Germany and near Aix-la-Chapelle ; Tertiary fossil wood 

 from Upper Cassel, near Bonn ; Miocene sharks' teeth from Belgium 

 and the Netherlands ; and lastly Agates and pieces of Chalcedony 

 from the Ehine district. 



These erratics clearly show that they have been partly derived 

 from the north-east, embracing the districts bordering the Baltic ; 

 partly from the south, in the Ehine valley and its tributaries ; and 

 partly from native rocks which underlie the present surface of 

 Overyssel and the adjoining provinces. G. J. H. 



