REFERENCE TO PLATES, VOL. XV. 309 



FIGURE PAGE 



3, 4. Holospira semisculpta Stearns. Proc. U. S. Nat. 



Mus 91 



5. Holospira bilamellata Ball. Specimen 82 



6-9. Holospira pilsbryi Dall. Specimen 86 



10, 11. Holospira bilamellata Dall. Proc. U. S. Nat. Mm 82 

 12, 13. Holospira mearnsi Dall. Proc. U. S. Nat. Mus. . . 87 



14. 15. Holospira pasonis Dall. Proc. U. S. Nat. Mus. . . 90 



PLATE 17. 



16-19. Coelocentrum dispar Pils. Pilsbry, del 44 



20-23. Coelocentrum exlex Pils. Pilsbry, del 50 



24. Ccelocentrum irregulare Gabb. Specimen 51 



25. Ccelocentrum eisenianum Pils. Pilsbry, del 55 



26, 29. Coelocentrum crosseanum Pf r. Pilsbry, del 47 



27, 28. Coelocentrum crosseanum Pf r. Novit. Conch. ... 47 



PLATE 18. 



30-32. Berendtia taylori Pfr. Moll. Mex 58 



33-36. Berendtia taylori Pfr. Specimens 58 



37. Epirobia polygyra Pfr. Pilsbry, del 64 



38, 39. Coelocentrum filicosta Pfr. Pilsbry, del . 47 



40, 41. Coelocentrum filicosta Pfr. Moll. Mex. and C. 



,Cab 47 



PLATE 19. 



41-44. Ccelocentrum arctispira var. estefaniae Pils. After 



Strebel 31 



45-47. Berendtia taylori var. estefaniae Pis. After 



Fischer 57 



48, 49. Epirobia apiostoma Pfr. After Strebel 59 



50-54. Holospira goldfussi Pfr. After Strebel 69-71 



PLATE 20. 



1-4. Epirobia berendti Pfr. After Strebel 61 



5-7. Epirobia gassiesi Pfr. Moll. Mex , 63 



8-10. Epirobia polygyrella Mart. Biologia 65 



11. Epirobia polygyra Pfr. After Strebel 64 



12-14. Epirobia apiostoma Pfr. Moll. Mex 63 



15. Epirobia apiostoma Pfr. Pilsbry, del 63 



16. Epirobia polygyra Pfr. Pilsbry, del 64 



17-19. Epirobia polygyra Pfr. Moll. Mex 64 



20-22. Epirobia swif tiana Crosse. Moll. Mex 62 



