No. 19. NAUTILUS. 



Sail Shell. Inhabitant a Sejria. 



Shell univalve, divided into several apartments, communicating with each 

 other by an aperture or sephunculus. The Linnaean Nautili consist of two 

 principal families; those which are spiral and rounded, and those elongated 

 and straight. The Nautilus Spirals (Linnaeus) affords an essential character, 

 which at once removes it from the Nautili; namely, the last character, which 

 is alone sufficient to distinguish it. This is a very common West India shell, 

 but scarcely one has the least vestige of this chamber. The chamber of this 

 shell is very thin and brittle; and as these shells inhabit deep water, and are 

 collected only from the rejectamenta of the sea, cast upon the beach in storms, 

 there is rarely seen a perfect specimen. 



The Nautili bear a considerable resemblance to the last genus; like which, 

 they are often seen floating on the ocean. The larger kind are entirely marine; 

 some of the smaller kinds are found in rivers and ponds, frequently adhering 

 to the leaves and scum of aquatic plants, and to pieces of wood; others are 

 found only in a fossil state. They are in three divisions. 



DIVISION I. Spiral, with contiguous whorls. 



Scientific name. 

 Pompilius, 



Locality. 

 Africa, Amboyna, China, 

 India. 



Scientific name. 

 Scrobiculatus, 

 Lacustris, 



Locality. 

 New Guinea. 

 Kent, Denmark. 



MINUTE OR MICROSCOPIC SHELLS. 



Calear, 



Rotatus, 



Laevigatulus, 



Depressulus, 



Crispus, 



Beccarii, 



Adriatic. 



Brit., Shores of Rimini. 

 Sandwich, Kent. 

 Reculver, do. 

 Britain, Mediterranean, 

 do. So. Seas, Adriatic. 



Balthicus, 



Crassulus, 



Umbilicatulus, 



Lobatulus, 



Rugosus, 



Umbilicatus, 



Baltic. 



Reculver, Kent. 

 Kent, Devonshire. 

 Britain, Norway. 

 Southern Ocean. 

 Croatia. 



Spirula. 



DIVISION II. Spiral, with detached whorls. 

 E. & W. Ind., America. 



