Serpula planoribus [ spec. nov.]

S. testa regulari orbiculata plana aequali.

Habitat in Conchis pelagicis.

Testa vix manifesta, nisi squamula orbiculata arcte adnata, absque omni spirarum rudimento externo, at fracta discedens horizontaliter, intus ostendit spiram peregrinae testae, cui insedebat, insculptam, tanquam circulos concentricos.