REFERENCE TO PLATES. 249 



PLATE 53. 



FIGURE. PAGE. 



81-83. Pleurobranchrea rneckelii Blv. Pilsbry, del., .... 224 



84. Pleurobranchrea meckelii Blv. After Bergh, 224 



85. Pleurobranchaea meckelii Blv. AJler Cantraine, .... 224 



86. Pleurobranchrea tarda Verrill. After Verrill, 225 



87. Pleurobranchnea novrezealandise Cheesem. P. Z. S., . . . 227 



88. 89. Pleurobrauchrea maculata Q. & G. Voy. Astrol., . . 227 

 90. Oxynoe antillarum Morch. Pilsbry, del., 164 



PLATE 54. 



90-94. Koonsia morosa Bgh. After Bergh, 222 



95. Pleurobranchsea luniceps Cuv. After Cuvier, 228 



96, 97. Pleurobranch&a luniceps Cuv. After Adams, . . . 228 

 98, 99, 1, 2. Pleurobranchus digued Roch. Pilsbry, del., . . 201 



3, Aglaja orbignyana Roch. Nouv. Archiv., 239 



4, 5. Oscanius dilatipes Ads. Gen. Rec. Moll., 216 



PLATE 55. 



1-4. Tethys willcoxi var. perviridis Pils. Pilsbry, del., . . 81 



5, 6. Tethys robertsi Pils. Pilsbry, del., . 89 



7-9. Petalifera ferussaci Rang. After Rang, 130 



10-12. Petalifera virescens Risso. After Vayssiere 129 



13, 14. Petalifera quadrata (virescens). After Sowb., . . 130 



PLATE 56. 



13, 14. Tethys californica Coop. Pilsbry, del., 89 



15-17. Tethys lessoni Rang. After Rang, 86 



PLATE 57. 



18, 19. Tethys angasi Sowb. Conch. Icon., 101 



20, 21. Tethys tigrina Sowb. (=sowerbyi). Conch. Icon., . .101 



22,23. Tethys sydneyensis Sowb. Conch. Icon., 101 



24-27. Tethys tryoniana Pils. Pilsbry, del., 96 



PLATE 58. 



28, 29. Tethys gigantea Sowb. Conch. Icon., 102 



30, 31. Tethys hyalina Sowb. (=excavata). Conch. Icon., . 100 

 32, 33. Tethys excavata Sowb. Conch. Icon., 100 



PLATE 59. 



34. Tethys fusca Tiles. After Rang, 104 



35, 36. Tethys elongata Pse. Don. Bism., 93 



