EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 



1 Base of Truncatella pulchella Pfr. 



2 " " Carib.eensis Sowb., from Chemn. pi. 2, 



fig. 22. 



3 Truncatella bilabiata Pfr., from Chemn. pi. 1, fig. 28. 



4 " Carib^ensis Sowb., from Chemn. pi. 1, fig. 36. 



5 " SUBCYLINDRICA Gray, from Chemn. pi. 2, fig. 2. 



g (( (( II u u u ^cr, 4. 



7 Base of Truncatella bilabiata Pfr., from Chemn. pi. 1 , fig. 30. 



8 " " SUBCYLINDRICA Gray. 



9 Truncatella pulchella Pfr., from Chemn. pi. 2, fig. 12. 



10 " " " " " pi. 2, fig. 13. 



11 Animal of Truncatella, from Adams Gen. pi. 78, fig. 1. 



12 Auricula cingulata Pfr., from Orbigny pi. 13, fig. 8. 



13 " " " " " pi. 13, fig. 9. 



14 Helicina Hanleyana Pfr., from Chemn. pi. 9, fig. 7. 

 Ambeliana Sowb., Thes. Conch, pi. 1, fig. 19. 

 Hanleyana Pfr., from Chemn. pi. 9, fig. 8. 

 subglobulosa Poey — twice the natural size. 

 MiNUTA Sowb., from Thes. Conch, pi. 1, fig. 41. 

 vestita Gould, " " pi. 1, fig. 42. 



CASTANEA Gould, " " pi. 1, fig. 32. 



21 Animal of Melampus COFFea Lin., from Ad. Gen. pi. 82, fig. 7. 



22 " Alexia denticulata Mont., " " pi. 82, fig. 5. 



23 Melampus bidentatus Say. 



24 Animal of chondropoma dentatum Say — twice the natural size. 



25 Melampus coffea Lin., fi-om Orbigny pi. 13, fig. 6. 

 2 7 Operculum of 24 — enlarged. 



