248 REFERENCE TO PLATES. 



PLATE 47. 



FIGURE. PAGE. 



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



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

 22, 23. PleurobranchusornatusCheesem. P. Z.S., 206 



PLATE 48. 



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

 29-31. Pleurobranchus citrinus Riipp. After Riippell, . .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., 219 



PLATE 50. 



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

 44,45. Oscanius testudinarius Cantr. After Vayssiere, . . . 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 Cantraiue. After 



Cantraine, .' 215 



56, 57. Oscanius tuberculatus Meckel 



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 mouterosatoi Vayssiere. After Vays- 

 siere, 196 



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

 73-75. Pleurobranchus perforatus Phil. After Philippi, . . 197 

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



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



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



