EXPLANATION OF PLATE XLIV. 



Crioceras axonoides, Eth.Jil. 



Pig. 1. Lateral view of a portion of a fine, partly testaceous, disk-like 

 shell. The costae are all single, sharp, slightly sigmoidal, and 

 moderately close ; at the proximal end large and prominent 

 tubercles gather the costas into fasciculi, but from the point at 

 which the latter cease the costas each bear a single tubercle along 

 the abdominal angles. A similar fasciculation is seen in C. uavti- 

 loides (Plate xlv., fig. 1), but the remainder of the costre are non- 

 tuberculate, and the sections of the two forms are very different. 

 Slightly more than half the natural size. 



Crioceras flindersi, McCoy, sj>. 



,, 2. Ventral view of the limb or shaft portion seen in Plate xxxvi., 

 fig. 2, and PI. xlii., lig. 1, with a broad, almost Hat venter, strong 

 abdominal tubercles, and the costaj on crossing the venter occa- 

 sionally single, but usually paired. Slightly more than half natural 

 size. 



