PLATE XXXI. 



Produotella SPIN0LICOSTA (page 217). 



Figure 1. Outline of ventral valve of the specimen from the Mackenzie Kiver 

 at " Grand View," referred to in the text. 



BuoMPHALUs (Straparollus) flexihtriatus (puge 242). 



Figure 2. The type of this species, as seen from above. 

 Figure 2a. The same, as seen from below. 



EuoMPHALDS (Straparollus) inops (page 242). 



Figure 3. Upper side of a specimen of this species from the Mackenzie River 



at the " Kamparts." 

 Figure 3a. Lower side of the same. 



EuoMPHALus Maskusi (page 243). 



Figure 4. View of the upper side of the most perfect specimen collected, 

 drawn from a gutta percha impression taken from a natural 

 mould of the exterior of the shell. 



GoNiATiTES (page 245). 



Figure 5. Side view of the specimen from the Hay Eiver referred to in the 

 text. 



Proetus Haldemani (page 246). 



Figure 6. Outline of a head of this species, from the Mackenzie River at 



" Grand View,'' as seen from above. 

 Figure 7. Outline of united thorax and pygidium of a specimen from the 



same locality. 

 Figure 8. Outline of another head of this species, also from " Grand View." 



