EXPLANATION OF PLATES. 
FIGURE. PAGE 
26, 27. Ferussina tricarinata, Braun. Miocene, Europe, 290 
98. Helicina variegata, WOrb. Cuba, 291 
29, 30. Helicina (Pachystoma) agelutinans, Sowb. Phil., 291 
31. Helicina (Pcenia) depressa, Gray. Jamaica, . 291 
32. Helicina (Idesa) rotunda, d’Orb. Cuba, 291 
33. Helicina (Emoda) festiva, Sowb. Hayti, . 291 
34. Helicina (Dawsonella) Meeki, ligiumene Carboniferous, 
Ohio, : ‘ 291 
30. Trochatella constellata, Morel. Isle of Pines, 291 
36. Trochatella (Viana) regina, Morelet. Cuba, 291 
37, 38. Schazicheila alata, ‘Menke. Guatemala, 291 
39. Alcadia Brownii, Gray. Jamaica, . 292 
40. Lucidella aureola, Fer. Jamaica, ; : 292 
41, 42. Bourciera heliciniformis, Pfr. Ecuador, 292 
43. Stoastoma pisum, C. B. Adams. Jamaica, . 292 
44, Stoastoma (Electrina) succinea, Sowb. Isle of Opara, 292 
45, 46. Stoastoma (Lewisia) Philippiana, C. B. Adams. 
Jamaica, : 292 
47. Proserpina ‘depressa, a’Orb. Cuba, ; 293 
48. Proserpina (Cyane) Blandiana, A. Ad. Peru, 293 
49. Ceres eolina, Duclos. Mexico, 293 
50. Ferussina (Scoliostoma) megalostoma, Sandberger. Mio- 
cene, Europe, : : 290 
PLATE 78. 
51. Nerita polita, Linn. New Ireland, 2 : . 294 
52. Nerita peleronta, Linn.; operculum. West Indies, . 294 
53. Nerita histrio, Linn. Australia, - 294 
54. Nerita undata, Linn. Polynesia, : : : . 294 
55. Nerita (Peleronta) Deshayesii, Recluz. Panama, . 294 
56. Nerita (Theliostyla) exuvia, Linn. Polynesia, . 249 
57, 58. Nerita (Deianira) bicarinata, Stolicz. Cret. , Europe, 294 
59. Deshayesia Neritoides, Grat. Tertiary, France, -- 295 
60. Neritopsis radula, Linn. Ceylon, : . 295 
61, 62. Neritopsis radula, Linn. ; operculum, . 295 
63. Neritoma angulata, Sowb. Jurassic, Europe, : . 295 
64. Neritoma (Neridomus) hemispherica, Romer. Oolite, 
Europe, - 295 
65. Neritina communis, ‘Quoy. Philippines, : ~ 295 
66. Neritina (Theodoxus) fluviatilis, Linn. Europe, . . 296 
67. Neritina (Theodoxus) Mertoniana. Philippines, . 296 
68. Neritina (Dostia) crepidularia, Lam. Ceylon, . 296 
69, 70. Neritina (Clypeolum) pulligera, Linn. Moluccas, . 296 
Tl. Neritina (Clithon) longispina, Recluz. Isle Rodrigues, 296 
72. Neritina (Neritona) labiosa, Sowb. Philippines, . 296 
73. Neritina (Smaragdia) viridis, Linn. West Indies, ON 
