OF CONCHOLOGY. 63 



arises, in how many of the remaining instances, as yet not so 

 well understood, has this same habit of easy assent to the correct- 

 ness of conjectural labels helped to diminish the reliability of 

 Mr. Binney's conclusions ? 



To Mr. Binney's successors remain many rich fields for in- 

 vestigation in the subjects he has " gone through." The sub- 

 genus Melaniho needs careful " working up.'' The genus Amni- 

 cola needs critical attention,— the species porata, pallida, limosa, 

 Justriea ?, orbiculata, and perhaps some others, being specially 

 urgent in their claims, — as it is clearly apparent there is yet 

 much confusion among them, which can be cleared up only after 

 recent specimens from original localities have been thoroughly ex- 

 amined and carefully compared. 



