TAB. VI. 



Fig. 



1 . Pleurotoma turricula, page 53. 



a. back view. 



h. front view of another specimen. 



2. Pleurotoma carinata,jo. 54. 



a. back view of a specimen from 



the Red Crag. 

 h. front view of a specimen from 



the CoraUine Crag. 



3. Pleurotoma semicolon (?),jo. 54. 



a. front view of var. a. 

 h. front view of var. /3. 



4. Pleurotoma intorta, jo. 53. 



a. back view of a worn specimen. 

 h. front view of another specimen. 



5. Trophon muricatum, y;. 50. 



6. Trophon paululum (enlarged), j). 51. 



7. Trophon scalariforme, p. 48. 



^/. back view of var. a. 



h. front view. 



c. back \dew of var. /3. 



Fig. 

 8. Trophon alveolatum, p. 49. 

 «. back view. 



b. front view. 



9- Trophon costiferum, p. 48. 

 «. front view, var. a. 



b. back view, var. )3. 



10. Trophon gracile,y^. 46. 



a. back view, var. o. 

 /5. front view of var. /3. 



c. front view of another specimen. 



11. Trophon consociale, /J. 49. 



a. front view. 

 h. back view. 



12. Trophon imperspicuum, y;. 50. 



13. Trophon altum,jy. 47. 



a. back view. 

 h. front view. 



14. Trophon gracilius (enlarged),/;. 51. 



