THE NAUTILUS. 35 



Laskeya, nom. nov. for Eumeta, Morch, 1868, not Walker, 

 1855. 



Collonista, gen. nov. for Collonia picta, Pease. 



Talopena, gen. nov. for Monilea incerta, Iredale. 



Korovina, gen. nov. for Vanikoro wallacei, Iredale. 



Forskalena, gen. nov. for Trochus fanulum, Gmelin. 



Enigmonia, gen. nov. for Anomia rosea, Gra,y=Aenigma aenig- 

 matica, Ancti. 



Amyclina, gen. nov. for Buccinum corniculum, Olivi. 



Pyreneola, gen nov. for Columbella abyssicola, Brazier. 



Caporbis, Bartsch, is a Vermetid nucleus. 



Propebela, gen. nov. for Murex ttirricula, Mont. 



Calceolata, nom. nov. for Calceolina A. Adams. 



Mirothyca, not Microtheca. 



Turrid names discussed: 



Colicryptus, gen. nov. for Buccinum fusiforme, Broderip. 

 Siphonorbis marshalli, nom. nov. for Fusus attenuatus, Jeffreys. 

 Cominella and Euthria subdivided: 



Afrocominella, gen. nov. for elongata, Dunker. 



Burnupena, gen. nov. for porcatum Gmel. = cincta, Bolten. 



Evarna, H. & A. Adams, must be used for linea, Martyn. 



Euthrena, gen. nov. for vittata, Quoy & Gaimard. 



Japeuthria, gen. nov. for/errea, Reeve. 



Syntagma, nom. nov. for Donovania, Bucquoy, D., & Dollfuss. 

 Acostsea, Orbigny, will replace Mulleria, Ferussac, 1828. 

 Gistel's Molluscan Generic Names, 1848, enumerated, 

 Damoniella, gen. nov. for Bulla cranchii, Fleming. 

 Muricodrupa, gen. nov. for Purpura fenestrata, Blainville. 

 Teretianax, gen. nov. for Scalenostoma suteri, Oliver. 



Presidential Address. By J. R. LeB. Tomlin. A Systematic 

 List of the Fossil Margincllidae, pp. 41-56. 



A SYNOPSIS OF THE CLASSIFICATION OF THE FRESH WATER 

 MOLLUSCA OF NORTH AMERICA north of Mexico, and A CATA- 

 LOGUE OF THE MORE RECENTLY DESCRIBED SPECIES, with notes. 



By Bryant Walker. Univ. of Michigan Mus. of Zoology, Misc. 

 Pub. No. 6. Students of North American fresh-water molluska 

 of this generation have had as a basis the invaluable manuals 



