i82 C O N C H O L O G Y. 



open 5 therefore the firft fet, which confti- 

 tutes tlie ninth family, is the Cymbium, or 

 Paper Nautilus. Plate HI. fig. 6. 



This family, it is true, has no external 

 fpires, nor indeed is it, ftridlly fpeaking, a 

 turbinated Shell, except at the very head, 

 which turns in one fpire only ; but, the 

 Shell being quite open, this fpire is ex- 

 pofed to view ; for it is evident, if the 

 Shell was not open, or vafcular, but, on 

 the contrary, was clofed or fliut up, it 

 w^ould come under Part III. of Revolved 

 Univalves : as the fpires like in the com- 

 mon or pearly Nautilus would be hidden, 

 or turn within the body of the Shell. 

 However, though fo unlike the Nautili in 

 not being chambered, yet, in form and 

 other particulars, it much agrees with 

 them. 



The definition of the Cymbium family 

 I ftate thus. Shells, in their external 

 fhape refembling a fhip or boat, whofe 



upper 



