SECTION XII. 26s 



them indifcriminately with the articulate 

 Cockles. 



Family 7. Arcae, the Arks or Boats, fuch 

 as have their hinges on a perfeft ftrait 

 line, and arc of a fomewhat fquarifh fi- 

 gure or oblong ; as the Noah's Arks and 

 fquarc Cockles. 



The rank the Arks hold in Authors 

 is : Lifter puts feme kinds among the 

 multarticulate Cockles, Lib. iii. P.IL Se(fl. 

 2. cap. I. and the Noah's Arks he places, 

 among the Mufcles, as many- toothed 

 Mufcles, Ibid. Seft. 6. cap. 2. Woodward 

 ranks them among his Polyginglymi for- 

 ma oblonga, or with family 5. fupra. 

 Argenville places them in his fourth fa- 

 mily, or of Heart Cockles ; but Davila 

 makes them a diftinfl: genus of his fourth 

 family, or Heart Cockles, and calls them 

 Arks. Gualtieri forms a genus of them 

 hy the name of Concha Rhombo'idalis : 

 and LinncEus and Meufchen rank them as 

 a diftincl genus, and call them Area, 



This 



