EXPLANATION OF PLATES. ALT 
FIGURE, PAGE. 
47. Rissoa (Alvania) abyssicola, Forbes. England, . . 264 
48. Rissoa (Sabanza) flammea, Frauenf. Australia, . . 264 
49. Rissoa (Hemistomia) Caledonica, Crosse. N. Caledonia, 264 
50. Rissoa (Diastoma) variculosa, Desh. Fossil, Paris basin, 265 
51. Putilla lucida, A. Ad. Japan, i ; ‘ ; . 265 
52. Nevillia picta, H. Adams. Mauritius, . : : . 265 
53. Littorinella minuta, Totten. Massachusetts, . . 265 
54. Hydrobia ulve, Pennant. England, . : ‘ . 266 
55, 56. Bithynella viridis, Moquin- Tandon. Europe, . . 266 
57. Bithynella (Vitrella) pellucida, Clessin. Germany, . 266 
58. Bithynella (Belgrandia) gibba, Drap. France, . - 267 
59. Mohrensternia angulata, Eich. E. Europe, . : - 267 
60, 61. Mohrensternia (Potamaclis) ieee: Forbes. 
Oligocene, Europe, . : . 267 
62. Mohrensternia (Paludestrina) piseium, ‘Orb. South 
America, . 3 ; ; : . 267 
63. Tricula montana, Benson. India, ‘ i . 268 
64. Tricula (Pachydrobia) paradoxa, Crosse and Fischer. 
Cambodia, . : : . 268 
65. Pyrgula helvetica, Mich. Switzerland, . : 2 . 268 
66. Pyrgula (Diana) Thiesseana, Clessin. "Greece, ; . 268 
67. Paladilhia pleurotoma, Bourg. France, : ‘ . 268 
68. Lartetia Bourguignati, Paladilhe. France, . é . 268 
PLATE 73. 
69. Bugesia Bourguignati, Paladilhe. France, . - GD 
70. Baikalia Angarensis, Gerstfeldt. L. Baikal, . ; . 269 
71. Baikalia (Liobaikalia) Stiediz, Dybowski. IL. 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, . : 2 . 269 
15. Potamopy rgus Candeana, dOrb. Cuba, : . 269 
76. Pyrgidium Tournoueri, Neumayr. Tertiary, Austria, . 269 
Wt. Py reidium (Prososthenia ) Schwarzi, Bue Tert., 
Austria, ’ : . 270 
78. Pyrgidium (Fossarulus) ‘Stachei, Neumayr. Tertiary, 
Austria, 5 4 . “ . 270 
79. oan limosa, Say. Pennsylvania, d d : . 270 
80, 8 Lithoglyphus lapidum, d’Orb. So. America, . . 270 
82. faiaunch (Benedictia) Baikalensis, Gerstfeldt.  L. 
Baikal, : . 271 
83. Lithoglyphus (Sullienia). Jullieni, Desh. Cambodia, . BT1 
“4 Gillia altilis, Lea. Pennsylvania, 5 . ‘ . 271 
5. Somatogy rus depressus, Tryon. Iowa, . : : atl 
