206 BULLETIN 112, UNITED STA'TES NATIONAL MUSEUM, 
Page. 
Leptopecten 19 
Leptothyra 172 
Leucosyrinx 68 
Lima 20 
Limatofusus 95 
Limatiila 20 
Limifossor 198 
Limopsis 16 
Lioceritliium 148 
Liocyma 43 
Liotia 173 
Liomesus 91 
Liriola 66 
LiroMttium 147 
Lirularia 179 
Lithophaga ^ 23 
Litiopa 155 
Littorina 152 
Littorivaga 153 
Longchaeus 120 
Lora 73 
Lottia 171 
Lucapinella 185 
Lucina 35 
Lucinisca 35 
Lucinoma 35 
Lyonsia 26 
Lyomiella 28 
Madia eroplax 178 
Macoma 46 
Macron 89 
Mactra 51 
Mactromeris ^ 51 
Mactrotoma 51 
Malletia 14 
MangiUa . 79 
Mantellum, 20 
Marcia 42 
Margarites 178, 180 
Margaritopsis 181 
Marginella 85 
Marsenina 167 
Martesia 56 
Megalomphalus 166 
Megalebennus 185 
Megafhura 185 
Megayoldia 13 
Melampus 66 
Melanella 117 
Melaraphe 153 
Menestho 130 
Merisca 45 
Page. 
Merovia 86 
Mesopleura 50 
M etaxia 144 
Metis 46 
Metzgeria ; 88 
Micranelluiu 149 
Microfusus 93 
Microglyphis : 60 
Milneria 32 
Miodontiscus 32 
Miralda 130 
Mitra 87 
Mitromorphu 87 
Modiolus 21 
Moerella 45 
Monia 21 
Mohnia 91 
Molleria 174 
Moniliopsis 69 
Mopalia 195 
Mormuld 127 
Murex 106 
Musculus 23 
Mya 52 
Myoforceps 23 
My oner a 29 
Mytilimeria 27 
Mytilus ■ 21 
Natica 163 
Navanax 64 
Navea 56 
Neaplysia 65 
Nematomenia 199 
Neosimnia 139 
Neptunea 109 
Nettastomella 56 
Neverita 165 
Niso 120 
Nitidella 104 
Nitidoscala 115 
Nodiscala 114 
Nodulus ; 157 
Norrisia 174 
Nucella 111 
Nucula 9 
Nuttallia 50 
Nuttallina 189 
Odostomia 128, 137 
Oldroydia 181 
Olivella 85 
Omphalius 
