PLATE 254. 



SEA SNAILS, PERIWINKLES, DRILLS, AND BORERS. 



Fig. 1. Lunatia heros, ]i. 700. 



Fig. 2. Purpura lapillus, p. 69d. 



Fig. 'i. Purpura lapillm, banded variety. 



Fig. 4. Nererita ditpUcafa, p. 700. 



Fig. .5. Ibjanassa oisoleta, p. 096. 



Fig. 6. Triiia Irhiitaia. 



Fig. 7. The Whelk, Bucciiium undatum, p. 699. 



Fig. H. Tlie Periwinkle, Tulgur carica, p. 694. 



Fig. 9. A^Ujri^ zoiialh. 



Fig. 10. Jslyrialunata. 



Fig. 11. Bissna aeideiis. 



Fig. 12. The Drill or Bin-er, Urosalpin cineria, p. 697. 



