140 



years 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 mollusca, 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 

 easily 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 VaUonia 

 pulchell.a Miiller, as good species! 



CORBICULAD.K. 



Spharium sulcatum r>amarck. 



Ponds, Vigo County. 

 Sph(erium striatinun Lamarck. 



Turkey Creek; Ohio River; Ponds, Vigo County. 

 Sphn'rium ti-ansversum Say. 



Abundant in the Ohio at Charleston. , 



Unionid.k. 



'^A7iodonta edentula Say. 



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

 River. 

 *Anodonta feriissaeiana Lea. 



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

 Joseph River. 

 Anodonta footiana Lea. 



Lake Hamilton ; Lake Maxinkuckee. 



*A11 names; thus inarki'it have Indiana representatives in ttie i*tat.e Museum, ut Indian- 

 apolis. 



