422 NEW GENUS AND SOME NEW SPECIES 



As it was described previously by Le Sueur's name " pli- 



cata" this must take precedence. Its habitat, Peru, I think 



very doubtful ; it most probably came from the United States. 



U. rariplicata. This is, no doubt, a variety of the above. 



U. purpurata. The recta answers to this description in 



every respect but the habitat. The author "believes" it 



came from Africa. The shell most probably came from the 



United States, in which case there could not be a doubt. 



f The description of these is so imper- 



T j j. .. feet that I cannot identify either of them, 



j'j l ?j. ' although they are all from this country, 



jj i 1 and the same species most probably in 



our cabinets. I doubt if either of them 



k should be retained. 



U. rarisulcata, j r™ ... c ,, 



TT . . r 1 hese are mere varieties of the com- 



II. coarctata. > , , 



Tr v planatus. 



U. purpurascens. ) 1 



U. radiata. Our author gives the Mya rudiata of Gmelin 

 and U. ochraceus of Say as synonymes to this species. It 

 cannot be both ; for the ochraceus is a perfectly distinct spe- 

 cies from the M. radiata, which, Chemnitz says, comes 

 from the rivers of Malabar. The radiatus described by 

 Barnes after Lamarck, and Say's ochraceus are distinct spe- 

 cies, and I have no doubt the Mya radiata of Gmelin is 

 distinct from both. Mr Say's figure, referred to by Mr 

 Barnes (pi. 2, fig. 8, Am. Conch.) as U. radiata, is undoubt- 

 edly an ochraceus. (See note on U. radiatus.) 



U. brevialis. This shell is pictured by Crouch ; it is thick, 

 and resembles the circulus of the Ohio, but is larger, less 

 round and radiated. It comes from the Isle of France, and 

 is, no doubt, a distinct species. 



tt -J ' f Are all mere varieties of the com- 

 er, cannifera, > , , 

 rT J . i plana tus. 



U. georgma, ) *■ 



U. clava. I cannot identify this species. The descrip- 

 tion is too short. Its habitat is Lake Erie and Nova Sco- 



