222 Messrs. A. H. Foord and Gr. 0, Crick on Muscular 



(b) Jurassic Species. 

 Nautilus, sp. nov. 

 Fig. 3 illustrates (£ nat. size) a specimen (B.M. no. 69767) 

 of a new species of Nautilus from the Inferior Oolite of Slier- 

 borne, in Dorsetshire. On the side of the specimen that is 



Ffc. 3. 



figured the anterior boundary of the muscular impression can 

 be traced as a groove from the umbilicus with but slight 

 interruption to the periphery. Upon the opposite side, which 

 is denuded of the shell and much eroded, only traces of the 

 impression can be made out. 



Nautilus polygonaliSj J. de C. Sowerby *. 

 Fig. 4 represents (^ nat. size) a specimen of Nautilus 

 * Min. Conch, vol. vi. 1826, p. oG, pi. dxxx. 



