1 III 



A.UTILUS. 



The use of "luteolus" as he specific name of the species in 

 question is therefore unwarinted by the description; is abso- 

 lutely contradicted by the hitats assigned, and rests solely 

 upon the identification of -peeiinen made by one student, 

 which was at once contradicid by another of equal ability, for 

 it must not be overlooked t in 1832 Lea was by no means 

 the "authority" that he at \ard> l-eraiue. 



ijn l,s-J'. Lea considered l " l'ni.> eornutus " to be a "pro- 

 tean species" whose "vari. < run into the u< sopus," and em- 

 braced those species which la afterwards knew as " Unio per- 

 plexus" and "foliatus." I as still later before lie appreciated 

 the sjieeilic differences exisng between I'nio verrucosus " 

 and " pustulosus; " or l.ei\\ i the " Unio i.lieatus and multi- 

 plicatus. ' ' ) 



Notwithstanding that Le: in IJvlJ . -.UIN <]>< -d with 1-Yrussac 

 over the cabinet of the latt. concernm- their "favorites, the 

 Unios," the latter student ho had specimens of the present 

 species in his cabinet) stuck . his opinion that the "luteolus 

 of Lamarck" was the "car .-, Say." 



In view of the above the .ntinued use of Lamarck's name 

 for the present species is early unwarranted, except by the 

 rather flimsy claim of usage. 



Turning now to the nan we adopt (faseiata. Rafinesque) 

 we find from its descrij>< : --n .[ Rafines M ue had before him an 

 extremely wide-spread . found practically all over the 



Ohio drainage, occurring, h rites, "in tin- rivers Ohio, Alle- 

 ghany, Muskingum, Kentuck, Green, Salt, etc." 



Aside from other charactei he states that In- species (which 

 though ordinarily small, att 3 a i. n-th of three inches) is in- 

 equilateral, elliptical, ventri. and rather thiek. 



Its epidermis is olive, with.rownish rays; a variety has dark 

 rays; another is greenish wii blackish rays, alternately wider 

 and narrower; others are copjr-colored, with olive rays. 



The nacre is bluish, exc : that in the last variety it is 

 :-y- white. The cardina tooth is " divaricate." 

 .indsome species approching the " ochraceus, Say." 

 ibove characters can bascribed to no known Naiad from 

 drainage except to te species in question. 







