307 



NAUTILUS. 



nautilus pompilius. — Linn, 



Mawe's Linn.pl 19,/. 1, 2. 



Mart. I, p. 226, Vign. 10, 1. 18,/. 164. 



This elegant shell is so well known, that a minute de- 

 scription of it is here unnecessary. Its form is spiral, 

 discoid; whorls contiguous, the last enveloping the 

 others; numerous cells separated by a thin pearly par- 

 tition, or transverse septum, concave on one side, and 

 perforated by a syphon running through them all. This 

 shell Lamarck conjectures to be only the partial cover- 

 ing of a molluscous animal, on whose body it is proba- 

 bly situated in a similar manner to that of the Spirula; 

 which fact is said to be confirmed by a recent traveller, 

 whose interesting remarks on natural history are likely 

 soon to be presented to the public. 



Nautilus pompilius Nautilus umbilicatus. 



AMMONITES— A fossil. 



ORBULITES.— A fossil. 

 x 2 



