62 University of Michigan 



U. cariosits Say 'ly, by Lea, Conrad, and Ferussac, but Lea 

 changed his opinion after the examination of Lamarck's type, 

 identifying it with siliquoideus Bar. There is no question that 

 Lamarck's brief description appHes better to cariosa ("poste- 

 rior end broader and rounded'') and that of the locaHties given, 

 the first (Susquehanna) has only cariosus, but not siliquoideus . 

 If the type of luteola is the latter, the description is unsatis- 

 factory. In either case, the name luteola cannot be used. 



The next name to be discussed is fasciata Raf . Conrad con- 

 siders this to be carinatus Bar. {ligamentinus auct.), and 

 according to Vanatta the "type" confirms this. However, 

 Frierson thinks that it is siliquoideus. The original description 

 of fasciata (see also under Actinonaias carinuta) gives the 

 characters : elliptic, convex, shell not thick ; epidermis little 

 rugose, olivaceous, with brown rays ; nacre bluish, cardinal 

 tooth rugose, divaricate; lateral tooth carinate; size up to over 

 three inches. This fits both species, and thus fasciata is not 

 identifiable. 



In view of Rafinesque's statement that his fasciata occurs 

 in the Ohio, Muskingum, Kentucky, Salt, Green, and other 

 rivers, and that while it is ordinarily a small species, yet he 

 had seen it more than three inches in length, it would seem 

 to be conclusive that it is not the same as siliquoidea Bar. 



A series of comparative measurements shows that of the 

 possible species known in the Ohio system to which it might 

 be approximated fasciola Raf. and carinata yibba Simp, are 

 the only ones that at all correspond to those given by Rafin- 

 esque. As between these two, so far as proportions are con- 

 cerned, there is not much choice. In the absence of any speci- 

 fication as to the character of the rays of fasciata, it is impos- 

 sible to refer it with any certainty to either, although the com- 

 parison with ochracea would seem to indicate fasciola rather 



