— 459 — 



MEGAYOLDIA (qov.G.) 62 



Melampus (G.) 55 



Melaraphe neritoides, Linné 398 



Meleagrina Savignyi, Monterosato 392 



MICRO YOLDIA (nov. G.) 62 



Mitrella (Sect.) 320 



Môllendorffia callitricha, Bavay et Dautzenb. n. sp. 35 



— Messageri, Bavay et Dautzenb. n. sp. 33 



— spurca, Ravay et Dautzenberg n. sp. 31 



MOLLERIOPSIS (nov. G.) 439 



Nassopsis crassilabris, Bourguignat 171 



— grandis, E. A. Smith 167 



— GuillemeJ, Martel et Dautzenberg n. sp. 172 



— Locardiana, Bourguignat 173 



— nassa, Woodward 165 



— paucicostata, E. A. Smith 170 



— tiarella, E. v. Martens 175 



— variabilis. Martel et Dautzenberg n. sp. 174 



NATALINA (G.) 265 



Natica Dillwyni, Payraudeau 399 



NEOHYALTMAX (no\. G.) 270 



NERITINA flupiatilis 270 



NUTTALINA cafTraYév 267 



Obba langsonensis, Bavay et Dautzenberg n. sp. . 29 



OBESULA (nov. G.) . . . . ' 60 



OBTORTIO (nov. G.) 421 



Odontostomia euryope, Cossmann n. sp. * . . . 233 



— synarthrota, Cossmann n. sp.* . . 234 



Odontura (Sect.) 297 



ORTHOYOLDIA (nov. G.) 62 



Ostrea Darwini, C. Mayer-Eymar (nom. nov.)* . 444 



— Moelchensis, C. Mayer-Eymar (nom, nov.)* 444 



— Reevei, C. Mayer-Eymar (nom. nov.)* . . 444 

 Paramelania (G.) 167 



