106 



Mr. J, Morris on a neir appr-irs 0/ Nautilus. 



X — .Description of a new species of Nautilus from the Lower 

 Greensand of the Isle of Wight. By J. Morris, F.G.S.* 



Nautilus Saxbii : Morris, 1817. 

 Testa ovali, compressa, complanata, laevigata, subumbilicata ; dorso 

 piano seu subcanaliculato ; aiifractibus compressis ; apertura sub- 

 triangulari, vel subsagittata, lateraliter compressa, antice truncata ; 

 septis numerosis valde sinuosis in umbilico flexuosis vel im- 

 pressis ; siphunculo subcentrali ? 



Shell discoidal, smooth, slightly umbihcated, with compressed 

 and somewhat angular volutions, contracted towards the margin, 

 with their greatest diameter near to the umbilicus ; apei-ture 

 somewhat triangular, laterally compressed, anteriorly truncate, 

 posteriorly impressed or notched by the preceding volution ; back 

 flat, or very slightly channeled in the middle. Septa numerous, 

 nearly equal, the margins very sinuous and rather incurved as 

 they pass over the back ; one sinus very large ; the other, near 

 the umbilicus, small, the intervening saddle placed on the greatest 

 convexity of the volutions. Siphuncle subcentral. 



The general form of this Nautilus is like that of Ammonites 

 Fittoni (d'Archiac) and Am. splendens (Sow.), both of which 



* Read before the Geological Society of London, 15th December 1817 



