234 PALEONTOLOGY. 



les-Bains ; the Nothosaurus aduncidens, with a large canine- 

 shaped recurved tusk in each prernaxillaiy, is from the muschel- 

 kalk of Crailsheim ; the other representatives of the genus (N. 

 giganteus, N. xenustus, N. Miinsteri, N. Andriani, N angusti- 

 frons, and N. mirabilis), are from the muschelkalk of Bayreuth 

 and Luneville. 



Genus Pistosaurus, Von Meyer. 



Sp. Pistosaurus longmvus. — In this genus the facial part of 

 the skull contracts abruptly in front of the orbits ; so that, 

 viewed from above, it resembles a long-necked bottle ; the 

 orbits are situated in the posterior half of the skull, and the 

 nostrils are lateral. From the muschelkalk of Bayreuth. 



Genus Conchiosaurus, Yon Meyer. 



Sp. Conchiosaurus clavatus. — The facial part of the skull is 

 less prolonged than in Pistosaurus, and the nostrils are ter- 

 mimal. The teeth are twelve in number on each side, are 

 subequal, with a pyriform crown, and are placed at widish 

 intervals. From the muschelkalk at Laineck, near Bayreuth. 



Genus Simosaurus* Von Meyer. 



Sp. Simosaurus Gaillardoti. — The fossils, chiefly cranial, 

 on which this genus is founded, occur in the dolomitic muschel- 

 kalk near Ludwigsberg, and in the muschelkalk of Luneville. 

 The skull presents the large temporal fossae, the divided nos- 

 trils, and the general depressed form and composition of that 

 of Nothosaurus and Pistosaurus. But its facial part is much 

 shorter; the muzzle is neither prolonged nor terminally ex- 

 panded, but forms the obtuse end of the short depressed face, 

 of which the premaxillary part is the narrowest. The nostrils, 

 consequently, although distant from the orbits by half the 

 diameter of the latter, are yet nearer the fore-end of the skull 

 than in the above-cited Sauropterygian genera. The nostrils 

 are relatively nearer to each other, the intervening bony tract 

 being due to the premaxillaries, which, relatively to the breadth 



* 2/^, snub-nosed. 



