Plate 17. 



Page. 



Fig. 1. Cadulus tetraschistus Wataon. 7.45 mm. Copy of Watson's figures 97 



2. Cadulus quadridentatus Dall. 9 mm 97 



3. Cadulus quadridentatus Dall. Enlarged tip 97 



4. Cadulus quadridentatus acompsus, new suhapecies. Type, 5.1 mm 100 



5. Cadulus tetrodon Pilsbry and Sharp. 5.6 mm 101 



6. Cadulus carolinensis Bush. 8 mm 102 



7. Cadulus carolinensis Bush. Apical features 102 



8. Cadulus poculum Dall. Type, 12 mm 108 



9. Cadulus spectabilis Verrill. Type, 15 mm 106 



10. Cadulus elephas, new species. Type, 17.5 mm 107 



11. Cadulus aequalis Dall. Type, 15 mm 109 



12. Cadulus grandis Verrill. Type, 15 mm 105 



168 



