EXPLANATION OF PLATES. 411 



41. Rissoa (Alvaiiia) abyssicola, Forbes. England, . . 264 



48. Rissoa (Sabanaja) flammea, Frauenf. Australia, . . 264 



49. Rissoa (Heniistomia) Caledonica, Crosse. N. Caledonia, 264 



50. Rissoa (Diastoma) variculosa, Desh. Fossil, Paris basin, 265 



51. Putilla lucida, A. Ad. Japan 265 



52. Nevillia picta, H. Adams. Mauritius, .... 265 



53. Littorinella minuta, Totten. Massachusetts, , . 265 



54. Hydrobia ulvaj. Pennant. England, .... 266 



55. 56. Bithynella viridis, Moquin-Tandon. Europe, . , 266 

 51. Bith3aiella (Vitrella) pellucida, Clessin. Germany, . 266 



58. Bith^aiella (Belgrandia) gibba, Drap. France, . . 267 



59. Mohrensternia angulata, Eich. E. Europe, . . . 267 



60. 61. Mohrensternia (Potamaclis) turritissima, Forbes. 



Oligocene, Europe, ....... 267 



62. Mohrensternia (Paludestrina) piscium, d'Orb. South 



America, ......... 267 



63. Tricula montana, Benson. India, ..... 268 



64. Tricula (Pachydrobia) paradoxa, Crosse and Fischer. 



Cambodia, ......... 268 



65. Pyrgula helvetica, Mich. Switzerland, .... 268 



66. Pyrgula (Diana) Thiesseana, Clessin. Greece, - . 268 



67. Paladilhia pleurotoma, Bourg. France, . . . 268 



68. Lartetia Bourguignati, Paladilhe. France, . . . 268 



Plate 73. 



69. Bugesia Bourguignati, Paladilhe. France, . . . 269 



70. Baikalia Angarensis, Gerstfeldt. L. Baikal, . . .269 



71. Baikalia (Liobaikalia) Stiedise, Dybowski. L. Baikal, 269 



72. Baikalia (Godlewskia) turriformis, Dybowski. L.Baikal, 269 



73. Baikalia (Trachybaikalia) carinato-costata, Dybowski, 



L. Baikal, 269 



74. Baikalia (Tryonia) clathrata, Stimpson. Colorado 



Desert, California, . , 269 



75. Potamopyrgus Candeana, d'Orb. Cuba, . . . 269 



76. Pyrgidium Tournoueri, Neumayr. Tertiary, Austria, . 269 



77. Pyrgidium (Prososthenia) Schwarzi, Neumayr. Tert., 



Austria, . . , . . . . . ' . 270 



78. Pyrgidium (Fossarulus) Stachei, Neumayr. Tertiary, 



Austria, 270 



79. Amnicola limosa. Say. Pennsylvania, .... 270 



80. 81. Lithoglyphus lapidum, d'Orb. So. America, . , 270 



82. Lithoglyphus (Benedictia) Baikalensis, Gerstfeldt. L. 



Baikal, 271 



83. Lithoglyphus (Jullienia) Jullieni, Desh. Cambodia, . 271 



84. Gillia altilis. Lea. Pennsylvania, . . . . ,271 



85. Somatogyrus depressus, Tryon. Iowa,, . . . 271 



