224 White on later Cretaceous deposits in Iowa. 
mon plain forms which occur in various formations, and which^ 
have few salient specific characters. The identification of Chem- 
nitzia ccrithiformis^ and Pseudobuccinuin nebrascense^ has been 
quite satisfactorily made. The remaining species is regarded as 
new, and is described in a following paragraph. 
The general character of this little collection of fossils is alone 
sufficient to suggest their affiinity with the fauna of the Fox 
Hills group, the ujopermost member of the marine Cretaceous 
series of the interior region of the continent. The specific 
identification of a part of the species of this collection, with 
formerly published characteristic forms of that group however, 
leaves no room for reasonable doubt upon that question. 
Genus Lispodesthes White. 
Lispodesthes ? /lazvorthi sp. nov. 
Shell of medium size; body subfusiform, wing large and 
prominent; spire prominent; the small apex usually made some- 
what obtuse by the deposition of callus; the whole surface of 
the shell covered by a greater or less thickness of callus; but 
which is a little thinner upon the back of the body volution than 
elsewhere. Where the callus is removed from the volutions of 
the spire they are seen to be moderately convex, about six in 
number, and marked bv numerous revolving raised lines, which. 
Fig. I. Dorsal view of Lispodesthes.^ haworthi ; natural size. 
are continued upon the body volution beneath the callus there^ 
No revolving ridge apjoears upon the volutions of the spire, but 
one is developed upon the back of the body volution and is con- 
tinued out upon the falciform process of the wing; beak moder- 
1 lb. p. 339, pi. 32, figs. 10, a, b. 
- lb. p. 350, pi. 31, figs. 5, a, b, C-, d. 
