EXPLA NATION OF PLATE XLIX. 



Crioceras ammonoides, Eth.fil. 



V"\£. I. Lateral view of a fairly well preserved specimen exhibiting slightly 

 sigmoidal costaa, usually single, but at times united into bundles of 

 two by pimple-like tubercles ; the latter may also occur on single 



COSt,T?. 



,, 2. Ventral view of Fig. I, showing the narrow depressed-convex 

 venter and abdominal tubercles. 



Crioceras taylori, Eth.fil. 



,, 3. Lateral view of the proximal end of a nontestiferous specimen with 



regular obtuse costaa. 

 ,, 4. Lateral view of the distal end of another similar specimen exhibit 



ing the curvature of the crozier, and nontuberculate nature of the 



species. 

 ,, 5. Lateral view of another distal end with coarser costa?. 

 ,, 6. Ventral view of Fig. 5. 



Crioceras laqueus, Eth.fil. 



,. 7. Lateral view of portion of a partly testiferous crozier (?) displaying 

 the sharp costse arranged in bundles of two or three, the fasciculi 

 united by a row of prominent tubercles supra-dorsal in position. 

 Slightly above natural size. 



,, 8. A similar specimen to Fig. 7 with coarse costa; and larger and 

 more acute tubercles. Slightly above natural size. 



,, 9. A third and somewhat similar specimen with marked fasciculation 

 of the costaa ; the supra-dorsal row of tubercles is very distinct, and 

 at the upper end of the figure is a tubercle of the abdominal series. 



