SECTION XII. 271 



There are feveral kinds of foffil Cunei, 

 which remain yet undifcovered recent or 

 living from fea ; and fome are very ele- 

 gant and curious : as for example, the 

 ftudded kind, PI. VI. %• 5. the reticu- 

 lated, and the fulcated Cunei, &c. 



Family 10. Placentae; Shells with equal 

 valves, whofe hinge or cardo lies quite 

 within the Shell, and in one valve confifts 

 of two flrait linear ridges, pretty promi- 

 nent, and laid obliquely to each other, fo as 

 to meet at one end in a very acute angle ; 

 and the other valve has two correfpondent 

 furrows. PI. VII. fig. 13. 



I know of but two fpecies of this ge- 

 nus, to wit, the Ch'meje Glafs or Pellucid 

 Oyjler. PI. VII. fig. 13. and the PoUJh 

 Saddle, 



I am the firft who has formed this genus ; 

 for Lifter places the Glafs Oyfter as an Ef- 

 callop, Linnaeus as an Anomia, and others 



as 



