140 



vears ago. with poor and scanty materials at his command. He succeeded in 

 involving the group in almost inextricable confusion for nearly a quarter of a 

 century, a result hardly to be wondered at with paucity of material and want of 

 familiarity with fresh water forms. So far from the truth is it that Mr. Binney's 

 disposition of these forms was wise that, without detracting a whit from his well 

 earned reputation as a student of our terrestrial moUusca, it may be fairly stated 

 that had he left the group severely alone its limitations would sooner and better 

 be reached. As species go, every form listed from Indiana is distinct and is 

 easilv separable, no matter how mixed the material may be. The embryonic 

 forms differ; the mature shells differ; their character is obvious to any who will 

 carefully study extensive series. What the specific value of certain forms 

 may eventually prove to be does not in the least affect the general proposition 

 that the group is composed of a number of forms which must be recognized as 

 species. It would, indeed, be a striking commentary on the acumen of American 

 conchologists if, after thirty years, no advance had been made in this group. And 

 this same writer accepts several undoubted synonyms of the circumpolar Vallonia 

 pulcheUa Miiller, as good species! 



CORBICULAD-E. 



S'phierium sulcatum Lamarck. 



Ponds, Vigo County. 

 Sphdrium striatinun Lamarck. 



Turkey Creek; Ohio River; Ponds, Vigo County. 

 Sphierium fransi-crsum Say. 



Abundant in the Ohio at Charleston. 



Unionid.e. 



'■''Anodonta edenlula Say. 



Ponds, Vigo County ; Bennett's Creek ; Wabasli River ; Cedar Creek ; St. Joseph 

 River. 

 '^Anodonta ferussaciana Lea. 



Bennett's and Coal creeks, Vigo County ; Five Mile Pond, Vigo County ; St. 

 Joseph River. 

 Anodonta footiana Lea. 



Lake Hamilton ; Lake Maxinkuckee. 



*A]1 names thus marked have Indianii roiTcsentiiiiTes in the State ^Museum, iit Indian- 

 apolis. 



