EXPLANATION OF PLATE XXXVI. 



Crioceras jackii, Eth.jU. 



Fig, |. Lateral view of a media in sized imperfect cast on which the older 

 and smaller whorls are wanting, but at the proximal end so pre- 

 served, three rows of tubercles are visible. Three quarters natural 

 size. 



Crioceras flindersi, McCoy., sp. ('?). 



2. Lateral view of a large nontesiiferous limb or shaft, showing a 

 convex venter, sharp, slightly sigmoidal and sometimes bifurcate, 

 Easciculate costse; between the two Hues of strong abdominal 

 tubercles it will be seen the costse are double. (See Plate xlii., fig. 

 2 ; PI. xliv., fig. 2). Three-quarters natural size. 



