308 REFERENCE TO PLATES, VOL. XV. 



FIGURE PAOB 



4. Ccelocentrum turns Pfr. Specimen 36 



5. Ccelocentrum turris Pfr. Conchyl. Cab 36 



6. 7. Ccelocentrum tomacella Morel. Conchyl. Cab 38 



8. Ccelocentrum tomacella var. rufescens Mart. Bio- 



logia 40 



9, 10. C celocentrum tomacella var. attenuatum Pfr. 



Conch. Cab , 40 



11, 12. Ccelocentrum tomacella var. clava Pfr. Conch. 



Cab 39 



13. Ccelocentrum tomacella var. clava Pfr. Moll. Mex. . . 40 



14. Ccelocentrum tomacella var. clava Pfr. After 



Strebel 39 



PLATE 13. 



15. 16. Ccelocentrum irregulare Gabb. Pilsbry, del 51 



17-19. Ccelocentrum gabbi Pils. Pilsbry, del 54 



20-22. Ccelocentrum eisenianum Pils. Pilsbry, del 55 



PLATE 14. 



21-23. Ccelocentrum tomacella Morel. Specimen 38 



24, 25. Ccelocentrum tomacella, sculpture of fourth whorl 



up, and of last whorl. Pilsbry, del 38 



26, 27. Ccelocentrum tomacella var. clava Pfr. Specimen. 39 

 28-32. Ccelocentrum arctispira ( ?) var. estefaniae Pils. 



After Strebel 43 



33. Ccelocentrum arctispira Pfr. P. Z. S., 1860 42 



34. Ccelocentrum arctispira Pfr. Conch. Icon 42 



35. 36. Ccelocentrum arctispira Pfr. Moll. Mex 42 



PLATE 15. 



1, 2. Holospira imbricata Martens. Malak. Bl 103 



3. Holospira tryoni var. gealei H. Ad. P. Z. S 85 



4, 5. Holospira microstoma Pfr. Moll. Mex 102 



6-8. Holospira claviformis Mart. (= elizabethae Pils.) 



Biologia 100 



9-14. Holospira elizabethae Pilsbry. Pilsbry, del 99 



15. Holospira elizabetha Pilsbry. J. de C., 1892 99 



16, 17. Holospira cretacea Pfr. Moll. Mex 104 



18-20. Holospira teres Mke. Phil., Abbild 104 



21, 22. Holospira teres var. minor Mts. J. de C., 1892. . 104 



PLATE 16. 



1, 2. Holospira arizonensis Stearns. Proc. U. S. Nat. 



Mus. . 81 



