29G PYRAMIDELLID^E. 



mella with several plications, lip thickened, often expanded. P. 

 AURIS-CATI, Chemn. 



This is the restricted Pyramidella of H. and A. Adams and 

 most of their successors ; the smooth shells which Lamarck 

 designated by that name, being generally known as Obeliscus. 

 The erroneous application of these names has become so well- 

 established that I confess I follow Dr. Fisher with some reluc- 

 tance in his correction of the errors. 



Subgenus SYRNOLA, A. Adams, 18G9. 



Shell small, subulate, polished ; whorls flattened, suture well 

 marked ; columelia with a single plication, outer lip simple. 



The Syrnolae are small, slender Pyramidellids, with a single 

 columellar plait. P. GRACILLINA, A. Ad. 



Section AGATHA, A. Ad., 1860. 



Shell oval acuminated ; spiral plication very strong. P. AUS- 

 TRALIS, Angas. 



Section AMATHIS, A. Adams, 1861. 



Aperture dilated, rounded in front, acute behind. Possibly- 

 synonymous with Agatha. P. VJRGO, A. Ad. 



Section OSCILLA, A. Adams, 1867. 



Shell solid, ovate or pyramidally turreted, imperforate; whorls 

 strongly spirally lirate ; aperture oval or subquadrate, with a 

 strong, transverse, median parietal plication. P. ANNULATA, A. 

 Ad. 



Section ORINA, A. Adams, 1870. 



Shell conoidal, profoundly umbilicated ; whorls flattened, 

 smooth ; aperture subquadrangular, with a single columellar fold. 

 0. PINGUICULA, A. Ad. 



Section ELUSA, A. Adams, 1861. 



Shell subulate, tnrreted ; whorls longitudinally plicate ; aper- 

 ture ovate, columelia with a single plait, outer lip lirate within. 



P. SUBULATA, P. TERES, A. Ad. 



The above groups are all founded on Japanese species, mostly 

 unfigured ; the characters appear to be unimportant. 



