360 Mr. Barneses Reclamation of Unios. 



your Journal, Vol. vi, page 115; and has since been correct- 

 ed by Dubois, the translator of Lamarck, in his synoptical 

 table, page 30th. This Unio is referred to Lamarck, vol. vi, 

 page 75, No. 23, and Lamarck in this place quotes Say's 

 American conchology, pi. 2, fig. 7. Now it so happens, that 

 the shell thus referred, is not Mr. Say's Unio ovatus, but his 

 U. cariosus, in a young state, and the author is correct in 

 saying, that it nearly approaches the Unio cariosus, of La- 

 marck, vol. vi, p. 226. The Unio ovatus, of Mr. Say, is emin- 

 ently distinguished by a slightly elevated obtuse keel around 

 the anterior slope, (posterior of Cuvier and Blainville.) See 

 American Journal of S. and A. vol. vi. p. 113. 



2. Unio Dombevanus. — The author has made two species 

 of Lamarck's Unio Peruvianas. The one is what I have na- 

 med Unio rugosus, with a plate and description, in the Jour- 

 nal, vol. vi, p. 126, and the other is the 



3. Unio undulatus. — The same shell as that figured in the 

 Journal, with the same name, and from the same locality, the 

 Ohio river. In the Journal, vol. vi, p. 120, Lamarck's Unio 

 Peruvianus is quoted with a mark of doubt. The same rea- 

 son which caused that doubt, has induced M. Valenciennes 

 to recommend, that Lamarck's name should be discontinued, 

 It comes from the Ohio, and not from Peru. The shell here 

 figured is a younger and smaller one than that figured in the 

 Journal. 



4. Unio verrucosus. — This, again, is our shell with the 

 same name. It is the variety (6) mentioned on page 1 24, 

 which is always much less than the one figured in the Journal. 

 The dimensions of the plate, of M. Valenciennes, are the 

 same as those of our shell. 



5. Unio tuberculosus. — This is the young of our U. ver- 

 rucosus, and not as the name might seem to indicate, our 

 U. tuberculatum. 



6. Unio Rostratus. — This the author marks Nobis. It is 

 Mr. Say's well known nasutus, but not the nasuTA of La- 

 marck, which circumstance probably led him into the error. 

 Lamarck's name should be changed, and Mr. Say's must 

 have preference. Both the names, nausutus and rostratus, 



