248 REFERENCE TO PLATES. 



PLATE 47. 



FIGURE. PAGE> 



18, 19. Oscanius hilli Hedley. P. L. S. N. S. W., 220 



20, 21. Pleurobranchus tessellatus Pse. Am. Journ. Coricb., . 203 

 22, 23. Pleurobranchus ornatus Cheesem. P. Z. S., 206 



PLATE 48. 



24-28. Pleurobranchus peronii Cuv. Voy. Astrol., .... 207 

 29-31. Pleurobranchus citrinus Riipp. After Rtippell, . .208 

 32, 33. Oscanius forskali ( marinus). After Riippell, . . .216 

 34, 35. Gymnotoplax scutatus(=martensi). After Mobius, . 211 



PLATE 49. 



36-38. Oscanius reticulatus Rang. Mag. de Zool., 216 



39-41. Pleurobranchus oblongus Aud. After Savigny, . . . 208 

 42. Oscanius blainvillei Less. Cent. Zool v ....".... 219 



PLATE 50. 



43,46. Oscanius testudinarius Cantr. After Philippi, . . . 213 

 44,45. Oscanius testudinarius Cantr. After Vayssi ere, . . . 213 

 47, 48. Tylodina americana Dall. Blake Rep./ 188 



PLATE 51. 



50, 51. Oscanius tuberculatus Meckel. After Vayssiere, . . 214 

 52, 53. Oscanius tuberculatus Meckel. After Forbes & Han- 

 ley, 214 



54, 55. Oscanius tuberculatus var. dehaani Cantraine. After 



Cantraine, 215 



56, 57. Oscanius tuberculatus Meckel 214 



58. Hyalopatina rushii Dall, from drawing of type, . . . .184 



PLATE 52. 



60, 61, 64, 65. Pleurobranchus plumula Mont. Forbes & 



Hanley, 193 



62, 63. Pleurobranchus stellatus Risso. After Vayssiere, . .194 

 66-68. Pleurobranchus monterosatoi Vayssiere. After Vays- 

 siere, 196 



69-72. Pleurobranchus brevifrons Phil. After Philippi, . . 197 

 73-75. Pleurobranchus perforatus Phil. After Philippi, . 

 76, 77. Pleurobranchus aurantiacus Risso. After Cantraine, 195 

 78. Pleurobranchus aurantiacus Risso. After Philippi, . . .195 

 79,80. Pleurobranchus aurantiacus Risso. After Vayssiere, . 195 



