PLATE XI. 



Capulds Canadensis (page 69). 



Figure 1. Cast of the interior of the shell ai the only specimen* known to the 

 writer, as seen from above. 



Pleueotomaria Valeria, Billings (page 71). 



Figure 2. View of a gutta percha impression of a natural mould of the apical 

 side of a specimen from Durham. 

 " .3. View of a similar impression of the umbilical side of » specimen 

 from Belwood. 



Pleurotomahia velaris (page 72). 



Figure 4. Lateral view of the type and only known specimen of this species. 

 '* 4a. Umbilical side of the same. 



Pleurotomaria Elora, Billings (page 74). 



Figure 5. Gutta percha impression of a natural m.)ukl of the apical side of a 

 specimen from Durham, showing portions of some of the 

 peripheral spines. 

 " 6. Umbilical side of a specimen from Aboyne, showing six long peripheral 

 spines and part of another. 



Pleurotomaria Galtensis, Billings (page 75). 



Figure 7. Lateral view of a gutta percha impression of a natural mould of a 

 specimen of this species, from Belwood. 



