140 THE NAUTILUS. 



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

 question is therefore unwarranted by the description; is abso- 

 lutely contradicted by the habitats assigned, and rests solely 

 upon the identification of a specimen made by one student, 

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

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

 the "authority" that he afterwards became. 



(In 1829 Lea considered the " Unio cornutus" to be a " pro- 

 tean species" whose "varieties run into theaesopus," and em- 

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

 plexus ' ' and ' ' f oliatus. ' ' It was still later before he appreciated 

 the specific differences existing between "Unio verrucosus" 

 and " pustulosus; " or between the "Unio plicatus and multi- 

 plicatus.") 



Notwithstanding that Lea in 1832 conversed with Ferussac 

 over the cabinet of the latter, concerning their "favorites, the 

 Unios," the latter student (who had specimens of the present 

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

 of Lamarck ' ' was the ' ' cariosus, Say. ' ' 



In view of the above the continued use of Lamarck's name 

 for the present species is clearly unwarranted, except by the 

 rather flimsy claim of usage. 



Turning now to the name we adopt (fasciata, Rafinesque) 

 we find from its description that Rafinesque had before him an 

 extremely wide-spread species, found practically all over the 

 Ohio drainage, occurring, he writes, "in the rivers Ohio, Alle- 

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



Aside from other cliaracters he states that his species (which 

 though ordinarily small, attains a length of three inches) is in- 

 equilateral, elliptical, ventricose and rather thick. 



Its epidermis is olive, with brownish rays; a variet)' has dark 

 rays; another is greenish with blackish rays, alternately wider 

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



The nacre is bluish, except that in the last variety it is 

 coppery- white. The cardinal tooth is "divaricate." 



A handsome species approaching the " ochraceus, Say." 



The above characters can be ascribed to no known Naiad from 

 the Ohio drainage except to the species in question. 



