o 
what simìlat lateral extension of thè axis. The dry o va stili adhere to thè 
inner side of thè spire, and thè shelI is evidently fresh. 1 bave seen one other 
specimen smaller than thè one described, and collected at thè sanie tirae. The 
only other species known from thè sanie loeality, (J. Pacifica, Dall,) is mùch 
compressed, bas not thè lateral extensions and has a difFerent sculpture, beside 
growing much larger. 
t 
