LECTURE XI. 



ent from the rest, and exactly similar in all re- 

 spects to the genus Sepia or Cuttle, except in 

 having expansile membranes at the two foremost 

 arms, a suspicion has often been entertained, that 

 it could not be the true or proper inhabitant of 

 the shell, but that it was some species of Cuttle, 

 which was a usurper of the shell in which it swam ; 

 and this suspicion was strengthened by the con- 

 sideration that many of the Univalve shells are 

 occasionally inhabited or usurped by some of the 

 smaller species of the Crab-tribe, as the Cancer 

 Bernardus, Diogenes, and others. 



As the animal of the Paper-Nautilus is ex- 

 tremely quick-sighted, and descends from the sur- 

 face on the least appearance of danger, it is very 

 difficultly obtained, and is principally found after 

 a storm, during which it is sometimes driven 

 ashore, 



Most of the European naturalists seenr, till 

 lately, to have coincided in opinion that the ani- 

 mal was not the real and proper inhabitant of 

 the shell, notwithstanding the testimony of the 

 celebrated Dutch observer, Rumphius, who, above 

 a century ago, during his residence in the island 

 of Amboyna, had opportunities of examining the 



