718 ON THE GENUS PETULARA. 



it does, that the Petalura of Leach is not the last of its race, but 

 that a greater and even more remarkable species, closel}^ allied 

 to it, still exists to add to our knowledge of this isolated form. 



EXPLANATION OF PLATE XXXIIL 



Fig. 1. — Petalnra ingentifisima, n.sp. ; J^ nat. size. 

 Fig. 2. — Petalura gigaiifea Leach; ^ nat size. 

 Figs. 3-4 — Petalura ingentissima, n.sp.; J^ appendages. 

 Figs. 5-6. — Petalura gigantea Leach; J" appendages. 



(Figs.1-2, photo H. King; figs.3-6, R.J.T. del.). 



