92 rafinesque's 



1 Anodonta aperta Raf. Oval elliptical much swelled, broader 

 behind and slanting, very smooth and dark brown outside, quite 

 gaping below, iridescent white inside. Length and diameter ^ of 

 breadth, axis at \. Flue large sp. 6 inches broad, shell rather thick, 

 beaks proeniinent, not gaping at the ends but below ; hinge streight 

 slanting ending in 2 small angles, no wrinkles on it, but slightly , 

 Ilexuolate beneath. 



2. Unio paplios Raf. Oval, flexuose and subtruncate behind, with 

 an obliqual ridge from the beak, brown outside with many minute 

 coucentric strias, inside purplish white. Length 2-3, diameter T-iS, 

 axis at 1-3 of the breadth. Pretty sp. 2 inches broad, shell rather 

 thin for TJnios, lamellar tooth slightly curved, cardinal tooth sub- 

 bilobe crenate. Beaks not prominent. 

 ODATELIA N. G. of N. American Bivalve jluviatile shell. By 



G. S. Rafinesque. 



One of our Ohio shells, which has been put with the Unios or 

 Anodonta by different writers ; it was unknown to me till I observed 

 it in Prof. Green's cabinet, and I immediately ascertained that it 

 must form a N. G. or group between Anodonta and Sulcularia. I 

 call it Odatelia meaning imperfect teeth. 



Odatelia Raf. Cardinal tooth imperfect like a callosity, with a 

 large desinense as in Alasmodon, becoming an imperfect lamellar 

 tooth angular as in Lasmigona This G. must belong to the series 

 of Anodonta, but forms the passage with Alasmodon. How Say 

 and Lea could put it with Unio! is rather strange. 



Odatelia radiata Raf. Elliptical flattened elongate, broader 

 behind with subtruncate end, outside olivaceous brown, with black 

 rays, inside bluish iridescent. Length 1-3, diameter 2-9, axis at 

 2-9 of the length. 



LJnio Oriens. Lea. 



Unio dehiscens. Say. 

 • Anodonta prelonga. Green. 



Breadth over 2 inches, shell rather thin both ends rounded and 



brown. 



[From the Atlantic Journal and Friend of Knowledge. No. V. page 165. 

 Philadelphia, 1833.] 



r3.651 

 On 3 N. G. of Land Shells froin Buenos Ayres in South America. 



By C. S. Bafnesque. 



They arc:' rom the cabinet of Prof Green, where they are not 



labelled, and wlio permitted mc to describe them. 



