458 



Fig. 1. 



Museum, legte ihm den Fall vor und bat ihn, eine richtige Abbildung 

 der Palatingegend von Ichthyosaurus zu veröflFentlichen. Vor einigen 



Tagen erhielt ich von Herrn Chas. W. 

 Andrews die Antwort, daß Herr Smith- 

 WooDWARD augenblicklich zu sehr be- 

 schäftigt sei, und daß er ihn ersucht 

 habe, die Sache zu untersuchen. Das 

 Resultat ist folgendes: "Owen's figure 

 of the specimen is almost completely 

 accurate, at least as far as concerns the 

 region in question. The bone 22 is a 

 little too far towards the middle line 

 and should at its lower end about upon 

 the alveolar groove, the inner border of 

 which it forms in part ; it is also drawn 

 a little too narrow. Fraas' figure, on 

 the other hand, is very incorrect. For 

 instance there is no groove whatever 

 between the bones marked by him Pa 

 and Imx^ on the contrary the former 

 bone, which seems clearly to be the pre- 

 maxilla, is convex from side to side up 

 to the alveolar groove at the lower end 

 and as I have said, there forms the inner 

 border of that grove. External to Fa 

 there is only one bone, the maxilla ; the 

 suture drawn by Fraas crossing the 

 inner alveolar border obliquely about 

 opposite the letters Fa and dividing Mx 

 from Imx is not to be seen at all on 

 either side of the specimen. The figure 

 of the end of the snout is necessarily 

 incorrect, but owing to the irregular 

 fracture and slight dorsal diplacement 



Diagrammatische Ansicht der Unterseite des Schädels von Ichthyosaurus zetlandicns 

 Seelet; nach dem Exemplar im Britischen Museum, mit Zuhilfenahme einer Abbildung 

 von Eugene Eddes-Deslongchamps , die im Le Jura. Normand Paris, Caen 1875 er- 

 scheinen sollte. Die Sutur zwischen dem vorderen Ende der Maxillaria und den Prae- 

 mazillaria beruht auf Vermutung, ebenso die vordere Ausdehnung des Vomer. 



Bo Basioccipitale. Bs Basisphenoid. Q Quadratum. Ju Jugale. Pt Pterygoideum. 

 Pa Palatinum. V Vomer. M Maxillare. PM Praemaxiliare. PN Hintere Nasen- 

 öffnangen. 



