242 EXPLANATION OF PLATES, VOL. XIII. 



FIGURE PAGE 



PLATE 19. . 



35. Placostyltis fibratus bairdi Rve. Conch. Icon., . . 42 



36, 37. Placostylus fibratus strigatus Pils. Ross, del., . . 4G 



38. Placostylus fibratus bairdi Rve., 42 



39. Placostylus fibratus edwardsianus Gass. Ross, del., . . 45 



40. Placostylus fibratus edwardsianus Gass. Faun. N.-Caled., 45 



PLATE 20. 



41. Placostylus fibratus bovinus Brug. Ross, del., . 



42. Placostylus senilis minor Kob. After Kolielt, 



43. Placostylus aesopeus Gass. After Gassies, 



44. Placostylus arenosus Gass. After Gassies, 



45. Placostylus abbreviatus Gass. After Gassies, . 



PLATE 21. 



46. Placostylus guestieri rhinocheti Kob. After Kobelt, . 52 

 4t. Placostylus fibratus imbricatus Gass. J. de C., 1873, . 44 



48. Placostylus guestieri confusus Pils. (Oicatricosus Kob.). 



After Kobelt 52 



49, 50. Placostylus guestieri orientalis Kob. After Kobelt, . 52 



PLATE 22. 



I, 2. Placostylus kanalensis tchioensis Kobelt. After Kobelt, 38 



3. Placostylus lamberti Gassies. After Gassies, . . .49 



4. Placostylus souvillei Morel. After Kobelt, . . .48 



PLATE 23. 



1. Placostylus kanalensis Crosse. Ross, del., . . .38 



2. Placostylus kanalensis Crosse. J. de C., 1894 . . 38 



3. Placostylus kanalensis Crosse. After Kobelt, . . .38 



4. Placostylus kanalensis subeff'usus Kob. After Kobelt, . 39 



PLATE 24. 



9. Placostylus guestieri Gass. After Kobelt, 

 10. Placostylus guestieri gatopensis Cr. J. de C., 1894, . 



II. Placostylus guestieri Gass. After Gassies, 



12. Placostylus rossiteri Braz. After Kobelt, 



13. Placostylus rossiteri Braz. J. de C., 1881, 



PLATE 25. 



14. Placostylus buccalis Gass. Faun. N.-Caled., 

 15,16. Placostylus guestieri Gass. Ross, del., 



IT. Placostylus fibratus insignis Petit. J. de C., 1850, . 

 18. Placostylus fibratus insignis Petit. After Kobelt, 



