410 EXPLANATION OF PLATES. 
F' GURE. PAGE. 
PLATE 638. 
41. Natica Alderi, Forbes. England, Q : ; . 204 
42. Natica canrena, Linn. West Indies, ; . 204 
43. Natica (Stigmaulax) cancellata, Lam. West Indies, . 205 
44, Natica (Lunatia) heros, Say. ’ Atlantic Coast, U..S., -. 205 
45. Natica (Neverita) duplicata, Say. Atl. Coast, 10 's., 205 
46. Natica (Anomphala) fluctuata, Sowb, Philippines, . 205 
47. Natica (Mamilla) maura, Lam. Philippines, , ~ 205 
48. Natica (Mamma) straminea, Recluz. Polynesia, . . 205 
49. Natica (Amaura) candida, Miller. Boreal seas, 205 
50. Natica (Amauropsis) canaliculata, Gould. Newfound- 
land, ete., . ¢ 206 
51. Natica ‘(Robinsonia) Ceylonica, Nevill. Ceylon, 206, 275 
52. Sigaretus neritoideus, Linn. Straits of Malacca, + 207 
3e Sigaretus (Naticina) papilla, Gmelin. Philippines, 2 207 
54. Sigaretus (Cryptostoma) haliotoides, Linn. W. Indies, 207 
55. Velutina capuloidea, Blainv., , F : 4 . 207 
56. Velutina levigata, Linn. England, : é : . 207 
57, 58. Lamellaria perspicua, Linn... Europe, . 3 . 209 
59. Lamellaria (Marsenina) depressa, Sutton, . ‘ . 210 
60. Cryptocella tentaculata, Montagu. Europe, : . 210 
61. Cryptocella latens, Muller, . avo : : . 210 
62, 63. Coriocella nigra, Blainv., : : ‘ E . 210 
64, 65. Limneria zonata, Gould. ‘Northern United States, 208 
PLATE 64. 
66. Natica (Ampullina) sigaretina, Lam. Eocene, Paris, . 205 
67. Natica (Naticopsis) ey M’Coy. Carboniferous, 
Great Britain, ©: | 206 
68, 69. Velutina (Leeptonotis) expansa, ‘Whitfield. Eocene, 
Alabama, 4 . 208 
70. Gyrodes alveata, Conrad. Cretaceous, Mississippi, . 206 
Tl. Natica (Isonema) humilis. Meek. Devonian, Ohio, . 206 
72, 73. Onchidiopsis glacialis, Sars. Norway, . : 7210) 
74. Velutina (Platyostoma) Niagarensis, Hall. Niagara 
group, New York, : ‘ : . 208 
75. Velutina (Strophostylus) obtusa, Hall. “Lower Helder- 
berg, New York, : ‘ : . 208 
76. Naticodon spiratum, Sowb. Carb., Europe, 4 S211 
77. Crucibulum (Catillina) concarmerata; Reeve ~ 212 
78. Crepidula (Spirocrypta) pileum, Gabb. Cret., Cal., . 213 
79. Galericulus altus, Seely. Cretaceous, . . 213 
80. Capulus (Brocchia) sinuosa, Bronn. Tertiary, Europe, 214 
81, 82. Platyceras ventricosum, Conrad. Young and adult, 214 
83. Platyceras (Orthonychia) spirale, Hall. Palseozoic,U.S., 214 
84. Euspira canaliculata, Morris and Lycett. Oolite, Eng., 206 
