FAMILY LITTORINIDAE. 

 Genus Littorina (Ferrusac.), Section Littorina. 



750. Littorina littorea (L.), Europe, N. coast of the U. S. 



751. Littorina rudis (Donovan), N. Europe, and U. S. 

 SECTION MELARAPHE (MUHLF.) 



752. Littorina scabra (L.), Mazatlan, Sandw. Is., Vitils., 

 Phil., China, Ind. O. 



753. Littorina varia (Sowb.), Peru, Panama, Mazatlan. 

 753 1-2 Littorina minima (Gray), W. I. 



GENUS TECTARIUS (VALENCE) 

 753 3 "4 Tectarius pagodus (Linn.), Australia, Moluccas, 

 Ceylon, Zanzibar. 



754. Tectarius bullatus (Martyn), Ind. O., Austr., Poly. 



755. Tectarius muricatus (L.), W. I., Bahamas, Florida. 



755 1-2 Tectarius nodulosus (Gmel.), N. Carolina, Ba- 

 hamas, W. I., Ceylon, Phil., Austr., New Zealand. 



GENUS MODULUS (GRAY) 



756. Modulus tectum (Gmel.), Sandw. and Viti Is., 

 Ind. O., Red Sea, Maur. 



756 1-2 Modulus lenticularis (Chemn.) [Auct.], W. I. 



FAMILY PLANAXIDAE 

 Sub-Family Planaxinae, Genus Planaxis (Lamark) 



757. Planaxis sulcatus (Born.), Sandw. I., Austr., Phil., 

 Maur., S. Africa. 



758. Planaxis planicostatus (Sowb.), San Bias, Panama, 

 Galapagos Is. 



759. Planaxis nucleus (Lam.), W. L 



FAMILY NERITIDAE 

 Genus Nerita (Adamson), Section Nerita (Lam.) 



760. Nerita albicilla (Linn.), Red S., Ind. O., Natal, 

 Singapore, China, Phil., Viti Is. 



761. Nerita plexa (Chemn.), East Africa, Capr., Mada- 

 gascar, India. 



762. Nerita exuvia (Linn.), Ind. O., E. Indies, Phil. 



763. Nerita reticulata (Karsten), East Indies, Poly. 



764. Nerita Senegalensis (Gmel.) W.Africa, Cape Verde 

 Is. 



