pares them, are modified vault-pieces, that rise ob- 
liquely upward out of the vault from above the horizon of the 
on the specific relations of these fossils may not be out of place. 
First a little planorbicular shell (fig. 6, pl. 1), referred by Prof. 
ag orbis, 
Rese 1s also clearly distinct specifically from the European 
2 gular dorsal side as in the German species. The latter 
th has its deepest umbilical concavity on the left side (placing 
® shell with the mouth turned downward and away = = 
1nitz 
side pe that there is a shallow furrow around the middle of the 
de . pee 22 
3 _ prominence to make it correspond to the S. spirorbit but 
ks this is due to the accidental pressing inward of this prom- 
* All the forei Semen a é fossils nlluded to in the ap belong to 
_ fhe Museum of the Smithsonian Institution AOE 
Aw. Jour, Scr.—Srconp Serres, Vou. XLIV, No. 131.—Sepr., 1867. noe 
roe 93 - eo) 3 nee ae 
« 
