Mr. Barneses Reclamation of Unios. 36 1 



safe descriptive of the same character of the shell — the unu-* 

 sual extension of the anterior side. (See Journal, vol. vi, p. 

 1 1 0—1 1 1 , and p. 273, No. 26.) 



7. Unio naviformis. Lam. — For this, both Lamarck and 

 this author refer to Mr. Say's Unio cylindricus, with a mark 

 of doubt. It is the same. Mr. Say's figure represents an 

 old shell from Dr. Barton's collection, now in the Philadel- 

 phia museum, and the figure of this author represents one 

 which is rather younger and smoother than an intermediate 

 one now in my collection, received from Mr. King of Buffalo, 

 and by him brought from the Ohio. This species, of which 

 we have now several specimens, was mentioned, p. 127 of the 

 Journal, but not described as it had been previously descri- 

 bed, by Mr. Say, and as one specimen only had then been 

 found ; and it seems there is yet only one known in France, 

 which one was carried thither by the younger Michaux, and 

 given to the museum of natural history. 



8. Unio rectus. — This shell resembles the Unio prselon- 

 gus, of the Journal, and, indeed, it has been supposed to be the 

 same. Lamarck's shell is, however, much less in size, and 

 uniformly, as far as my observations have extended, different- 

 ly colored on the inside. The rectus has the inside either 

 white or with a pale tinge of red, and the prcelongus is of a 

 deep and splendid purple. The variety, with the inside whi- 

 tish green, mentioned in the Journal is the Unio rectus, of La- 

 marck, which name, and not his purpuratus, has the prefer- 

 ence to ours. 



Most beautiful specimens of the Unio rectus are found in 

 Lake Champlain, at Ticonderoga point. 



9. Unio hians. — This is the Alasmodonta undulata, of Mr. 

 Say ; a genus which the French have not yet admitted into their 

 books. It is, however, a natural genus, of which we have now 

 five or six well characterized species ; every one of which may- 

 be instantly distinguished from the Unios, by the color and pe- 

 culiar smell of the animal, and by the yellowish tinge on the 

 inside of the shell. It is a matter of regret that the animals 

 have not yet, to our knowledge, been carefully examined by 

 an acute and discriminating comparative anatomist. They 

 will, no doubt, prove to be different. It is remarkable that 

 this genus should still be included under the Unio, when it has 



Vol. XIIL— No. 2. 21 



