TAB. XXI. 



Fig. 



1. Voluta Forbesii. No. 105, p. 166. 



a. Back view, young shell, natural size. 



b. Back view, adult shell, ditto. 



c. Front view of the same, magnified. 



d. Back view, ditto, ditto. 



2. Voluta horrida. No. 104, jo. 166. 



a. Back view, natural size. 



b. Back view, magnified. 



c. Ribs, magnified. 



3. Voluta geminata. No. 103, p. 165. 



a. Back view, adult shell. 



b. Front view, ditto. 



4. Voluta spinosa. No. 101, p. 162. 



a. Back view. 



b. Front view. 



5. Voluta denudata. No. 100, J*. 162. 



a. Back view, shell of mid-growth. 



b. Front view, adult shell. 



c. Back view, young shell. 



6. Voluta calva. No. 106, p. 167. 



a. Back view, adult shell. 



b. Front view, shell of mid-growth. 



7. Voluta athleta. No. 99, p. 161. 



«. Front view, adult shell from Barton. 



b. Back view, ditto, ditto. 



c. Back view, shell of mid-growth, ditto. 



d. Front view of the same. 



e. Back view (Var. Fortis), adult shell from Highcliff. 



8. Voluta depauperata. No. 102,^. 164. 



a. Back view, adult shell from Barton. 



b. Back view, ditto from Colwell Bay. 



c. Front view, ditto, ditto. 





