362 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



testae sequans, iuflatus, leviter obliqims ; apertura patula, intus fusco 

 fasciata; labrum acutum. Operculum corneum, fuscum, concentrice 

 conspicue plicatum. Long. 43, lat. 35 mm. ; apertura, long. 31, 

 lat. 20 mm. 



Hah. — Amazon River. 



A shell of light substance and colour, witli an unusually expanded 

 aperture. It somewhat resembles A. dolioides. Reeve, but has not 

 the sutural depression characteristic of that species. 



