68 THE ELEMENTS 



In Turton's Linne five species of 

 this genus are described ; none of 

 which have been found to inhabit the 

 British seas. 



Genus 19th -NAUTILUS. Ani- 

 mal (Rumphfius Mus. table 17, fig. B;) 

 shell univalve, divided into several de- 

 partments, communicating with each 

 other by a sephunculus or aperture. 

 Linn. Syst. 318. Plate 7th, fig. 19th. 



The Linnean Nautili are divided 

 into two families : *spiral and rounded, 

 * # elongated and straight. Of the for- 

 mer there are two sections : -j whorls 

 contiguous, -j~f*whorls separated. 



Habitation. With a very few ex- 

 ceptions the Nautili have only been 

 found to inhabit the ocean. 



Some modern authors propose to 

 divide this genus into three : Nauti- 

 lus, Spirula, and Orthocrea. 



Many of the Nautili are found in a 

 fossil state ; see Parkinson's Organic 

 Remains, vol. 3. 



