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 4 of 
breadth, axis at }. Fine large sp. 6 inches broad, shell rather thick, 
beaks proeminent, not gaping at the ends but below; hinge streight 
slanting ending in 2 small angles, no wrinkles on it, but slightly 
flexuolate beneath. 
2. Unio paphos Raf. Oval, flexuose and subtruncate behind, with 
an obliqual ridge from the beak, brown outside with many minute 
concentric strias, inside purplish: white. Length 2-3, diameter 7-18, 
axis at 1-3 of the breadth. Pretty sp. 2 inches broad, shell rather 
thin for Unios, lamellar tooth slightly curved, cardinal tooth sub- 
bilobe crenate. Beaks not prominent. 
ODATELIA N. G. of N. American Bivalve fluviatile shell. By 
C. 8. 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 
eall it Odatelia meaning imperfect teeth. 
OpaTELIA Raf. Cardinal tooth imperfect like a callosity, with a 
large desinense as in Alasmodon, becoming an imperfect lamellar 
tooth angular asin 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. 
Unio 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. ] 
(165) ) 
On3 N. G. of Land Shells from Buenos Ayres in South America. , 
By C. 8. Rafinesque. 
They are.rom the cabinet of Prof. Green, where they are not 
labelled, and who permitted me to describe them. 
