PLATE XII. 



Pleurotomaeia Deiopeia, Billings (page 75). 



Figure 1. Side \iew of the type of this species, from Eloi'a. 



" la. Portion of the exterior of the test, three times the natural size, to 

 show the surface markings. 



Figure 2. 



Pleurotomaeia Viola, Billings (page 76). 

 Umbilical side of the type of this species, from Gait. 



Figure .S. 



MuHCHisoNiA. Species uncertain, (page 79). 

 One of the specimens from Durham referred to in the text. 



Figure 4. 



MuRCHisoNiA TUREiTiFOEMis, Hall (page 84). 



Side view of an unusually well preserved specimen of this species, 

 from Elora. 



MuRCHisoNiA BiviTTATA, Hall (page 82). 



Figure 5. C4utta percha impression of a natural mould of the exterior of a shell 

 of this species, from Belwood. 

 " 6. Natural and longitudinal section of the upper part of a shell of this 

 species, from Belwood, showing the 1 ransverse, concave, calcareous 

 partitions of the earlier volutions of the spire. 



LoxoPLOCUS SOLUTUS (page 84). 



Figure 7. Side view of an impression in wax from a natural n;ould of the exterior 

 of a. shell of this species, from Elora. 

 " 8. Wax impression of a similar mould of a specimen from Belwood. 



