PLATE IX. 



This species is found in abundance on most of the British shores j 

 it adheres to shells, stones, claws of lobsters, &c. but chiefly to the 

 leaves of Fucus serratus, and other sub-marine plants. It is a 

 strong Shell, white, and without polish; is never complicated, or 

 laid one on another, but are dispersed singly over whatever substances 

 they are afiixed to. Petiver calls it the Wrack Spangle, because it 

 appears like so many white spangles on the dark-coloured leaves of the 

 Wracks. — ^A piece of this sub-marine plant, with the Shells adhering 

 to it, is a very pleasing object for the opake microscope. 



Fig. I. represents tlie natural size of the Shells. Fig. II. shews one 

 magnified. 



Obs. Dr. Lister, in his original edition, ranked this Shell among the Worm-Shells (tab. 

 533- ^S* S-) calling it Nautlloides, only from its wreathed form like to a Nautilus^ but 

 his re-editor, the Rev. Mr. Huddesford, has been pleased to reverse the Doctor's ar- 

 rangcment., by transposing it to the Nautilus family, where it now is (tab. 553), and thereby 

 fixes an error of arrangement on Dr. Lister's memory, which that excellent and accurate 

 ccnchologist was not guilty of. Da Costa, f>age 23. 



