PLATE XIII 



EuoMPHALus INORNATUS (page 85). 

 Figure 1. Cast of the interior of a shell of this species, from Durham. 



LoxoNEMA MAfjNUM, Whitfield. Var. (page 87). 

 Figure 2. Side view of a specimen from Flora. 



Pycnomphalds solaeioides, Hall. Sp. (page 88). 



Figure 3. Apical side of a cast of the interior of a shell of this species, from Dur- 

 ham. 



" ,3a. Lateral view of the same. 



" 4. Wax impression of a natural mould of the exterior of (he umbilical 

 side of a shell of this species, from Belwood, shewing the thickening 

 of the lip on the columellar side of the almost closed umbilicus. 



" 5. Umbilical side of a cast of the interior of a specimen from Belwood, 

 shewing that the umbilicus is deep and rather wide, when no ves- 

 tige of the test or of the spiral ridge around the umbilicus is 

 preserved. 



" 6. Vertical section of a specimen from Durham, shewing the test of the 

 inner side of the volutions, and the very prominent spiral ridge 

 around the umbilicus. 



" 7. Umbilical side of a cast of the interior of the shell from Durham, with 

 the umbilicus almost filled by the base of the spiral ridge and a 

 cast of the remainder of the ridge. 



" S. Umbilical side of a similarly preserved but smaller specimen from Dur- 

 ham. 



PoLYTROPis SULCATUS, Hall. Sp. (page 89). 



Figure 9. (iutta percha impression of a natural mould of the exterior of a shell 

 of this species, from Belwood. 

 " 9a. ^ Umbilical side of the same. 



POLYTKOPIS PARVULUS (page 92). 



Figure 10. The type and only known specimen of this species, from Durham. 

 " 10a. Umbilical side of the same. 



