EXPLANATION OF PLATE XLI. 



Cbiocebas flindersi, McCoy, sp. 



Fig 1. Lateral view of tin- proximal portion of a large natural cast with 

 rather sigmoidal costae in places slightly fasciculate, the component 

 ribs of the fasciculi united by the usual longitudinally elongated 

 tubercles. 



,, 2. Lateral view of portion of a large whorl, partly testiferous, in which 

 the characters referred t'> under Fig. 1 are more forcibly emphasised. 



,, 3. Lateral view of portion of a shall or limb with the remains of the 

 nacreous layer, provisionally referred to this species, in which the 

 tubercles have become rounder and more node-like. 



