PLATE XIV. 



PoLYTEOPis DuEHAMENsis (page 91). 



Figure 1. Gutta peroha impression of a natural mould of the exterior of the 



apical side of a shell of this species, from Durham. 



" 2. Umbilical side of a specimen with the test preserved, from Durham. 



HoLOPEA Geacia, Billings, (page 95). 

 Figure 3. Umbilical side of the original type of this species, from Gait. 



SuBULiTBS COMP ACTUS ? Var. (page 96). 



Figure 4. A small specimen from Durham, twice the natural size. 

 " 5. Another specimen from the same locality. 



Paucispieal Operculum (page 96). 



Figure 6. Exterior of the largest and most perfect specimen known to the writer. 



Cyetoceras Oeodes, Billings, (page 103). 



Figure 7. Ventral view of the original type of this species, from Hespeler. The 

 dotted lines indicate the position of the siphuncle. 



" "la. Outline of a transverse section of the same, showing the position 

 of the siphuncle. 



" 8. Dorsal view of a specimen from Durham, supposed to be referable to 

 this species, with the test preserved, to shew the surface markings. 



" 8a. Ventral view of the same, ground down to show the septa and 

 siphuncle. 



" Sb. Outline of transverse section of the same, at the larger end. 



" 9. Ventral view of another specimen from Durham, also supposed to be 

 referable to this species, with the test preserved, and showing the 

 faint hyponomic sinuses of the incremental strise of the test. 



