TAB. VI. 



Fig. 



1. Pleurotoma turricula, page 53. 



a. back view. 



b. front view of another specimen. 



2. Pleurotoma carinata,jo. 54. 



a. back view of a specimen from 



the Red Crag. 



b. front view of a specimen from 



the Coralline Crag. 



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



a. front view of var. a. 



b. front view of var. (3. 



4. Pleurotoma intorta, p. 53. 



a. back view of a worn specimen. 



b. front view of another specimen. 



5. Trophon muricatum, j. 50. 



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



7. Trophon scalariforme, p. 48. 



a. back view of var. a. 



b. front view. 



c. back view of var. . 



Fig. 



8. Trophon alveolatum,^. 49. 



a. back view. 



b. front view. 



9. Trophon costiferum, p. 48. 



a. front view, var. a. 



b. back view, var. /3. 



10. Trophon gracile, /;. 46. 



a. back view, var. a. 

 5. front view of var. |3. 



c. front view of another specimen. 



11. Trophon consociale, j. 49. 



a. front view. 



b. back view. 



12. Trophon imperspicuum, p. 50. 



13. Trophon altum,jy. 47. 



. back view. 

 b. front view. 



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



