PLATE XXIII. 



Vbstinautilus CARiNiFEuus, ./. cU G. Sowevbj/, sp. 



Fig. 1 a. Lateral view of a perfect specimen, showing the strong keel border- 

 ing the umbilicus, hidden in the inner whorls. 1 h. Front view of the same, 

 showing faint ridges whicli divide the periphery longitudinally into three distinct 

 areas. Clane. Dublin Museum of Science and Art. (Page 82.) 



Fig. 2. Lateral view of a specimen showing the septation, some of the test 

 still adhering to the cast. St. Doulagh's. Dublin Museum of Science and Art. 

 (Page 82.) 



Fig. 3. Front view of a young specimen with remarkably strong peripheral 

 keels. Ardtomin, county of Limerick. Dublin Museum of Science and Art 

 (Geological Survey Collection). (Page 82.) 



Vestinautilus crateriformis, sp. nov. 



Fig. 4 a. Lateral view, showing septate part and most of the body-chamber ; 

 some of the test remains. 4 h. Front view, showing the arched conformation of 

 the sutures in crossing the periphery. 4 c. View of the base of the body- 

 chamber, showing the position of the siphuncle, also the annular or dorsal lobe of 

 the sutures. Glenbane West, county of Limerick. Dublin Museum of Science 

 and Art (Geological Survey Collection). (Page 85.) 



