DESCRIPTION. 159 



and the necessary alteration is made in the terms 

 of the specific description. 



Fig. 3. H. nemoralis. 



Shell imperforate, rounded, smooth, diapha- 

 nous : aperture pyriform, or irregularly lunate. 



Lister Conch. Tab. 57. Fig. 54. 



Specimen pale orange, margin of the aperture 

 brown ; whorls five. 



Inhabits the woods of Europe. 



Fig. 4. H. Columna. 



Shell tapering ; whorls contrary ; aperture 

 oblong. 



Lister Conch. Tab. 38. Fig. 37. 



Specimen white, pellucid, with purplish longitu- 

 dinal rays ; longitudinally and transversely striate. 



Inhabits Guinea. 



Fig. 5. H. stagnalis. 



Shell imperforate, ovate, subulate ; aperture 

 ovate. 



Lister Conch. Tab. 123. Fig. 21. 



Specimen pale yellowish brown, darker towards 



