320 REFERENCE TO PLATES, VOL. XVI. 



31, 32. Microceramus latus Gundl. Novit. Conch 171 



33, 34. Microceramus latus var. Winchester, del 171 



35. Microceramus maculatus Wright. Novit. Conch. . . . 170 



36. Microceramus paivanus Pfr. Winchester, del 169 



37-39. Microceramus nigropictus Gundl. Winchester, del. 170 



40, 41. Microceramus costellaris Gundl. Winchester, del. 169 



42. Microceramus petitianus Orb. Winchester, del 165 



43. Microceramus petitianus perconicus Pils. Winches- 



ter, del 166 



44. Microceramus palenquensis Gundl. Novit. Conch. . . 165 



45. Microceramus minor Arango. Novit. Conch 167 



46. Microceramus simplex Pfr. Novit. Conch 167 



47-49. Microceramus elegans Gundl. Winchester, del. . . 164 

 50. Microceramus elegans infradenticulatus Wr. Win- 

 chester, del 164 



PLATE 28. 



[Figs. 1, 5, 7, 8, 9 drawn by Helen Winchester; the others by H. A. Pilsbry.] 



1-4. Megaspira ruschenbergiana Lea 182 



5, 6. Megaspira elata Gld 186 



7. Megaspira elatior robusta Pils 185 



8. Megaspira elatior gracilis Pils 188 



9. 10. Megaspira elatior Spix 185 



PLATE 29. 



[Fig. lf> from Deshayes; 18 from Cox: the others drawn by Pilsbry.] 



11. Megaspira elatior robusta Pils 185 



12, Id. Megaspira elata Gld 186 



14, 15. Megaspira elatior gracilis Pils. . . 185 



16, 17. Eomegaspira exarata Mich 187 



18. Perrieria australis Forbes 192 



19. Perrieria australis Forbes. North Pine river 192 



PLATE 30. 



20. 21. Perrieria clausiliseformis T.-C. J. de Conch 189 



22. Perrieria clausiliaef ormis T.-C. Ann. Mus. Genov. . . 189 



23. Perrieria c. arf akiensis Pils. Ann. Mus. Genov. . . . 190 



24. Perrieria minor Smith. Ann. Mag. N. H 190 



25. "Cceliaxis" exigua Ad. & Ang. P. Z. S., 1867 193 



26. Perrieria australis Forbes. Warroo. Pilsbry, del.. 192 

 27-29. Perrieria australis Forbes. N. Pine river. Pils- 

 bry, del 192 



30-32. Callionepion iheringi Pils. & Van. Pilsbry, del. . . 179 



