618 STUART WELLER 



stones at Burlington, which belong to the same horizon." Further 

 than this, no description of the fauna of this typical Kinderhook 

 section has ever been given. 



The collection upon which the following list is based was made 

 at the typical locality, the point of the bluff just above the village of 

 Kinderhook. A few fossils were collected from the fine-grained 

 limestone, bed No. 3, but they are so poorly preserved as to be scarcely 

 identified with certainty. As indicated by Worthen in his original 

 description of the section, the fossils occur most abundantly in the 

 thin-bedded sandstones of bed No. 2. They do not, however, occur 

 uniformly through this bed, but are restricted to a narrow horizon 

 from 20 to 25 feet below the base of the fine-grained limestone, bed 

 No. 3. The exact limits of this fossiliferous horizon have not been 

 definitely determined because of the thickly covered talus slope, 

 but it probably extends through not more than a foot or two of strata. 



The fauna of this bed is of much interest, and the contained 

 species will be briefly discussed in order. 



1. Orbiculoidea sp. undet. A single specimen of this species has 

 been observed. It is a brachial valve about i5 mm in diameter; 

 the apex is excentric and is more than ordinarily sharp for 

 members of this genus, the surface of the shell sloping away on 

 all sides from the apex to the margin, with a concave curve. 



2. Crania? sp. undet. This species is represented in the collection 

 by a single depressed-convex internal cast of a subcircular shell 

 about i2 mm in diameter. It is too imperfect to allow its rela- 

 tionships to be determined with accuracy, and its generic iden- 

 tification may be incorrect. 



3. Orthothetes chemungensis Con. The species of Qrthothetes 

 which occur in the Kinderhook beds of the Mississippi Valley 

 are so indefinitely characterized that it is exceedingly difficult 

 to make satisfactory identifications. Several different species 

 have been described by various authors, and some of them at 

 least are doubtless good species. The species from Kinderhook 

 are apparently identical with those from the Chonopectus fauna 

 at Burlington, Iowa, which have been identified as O. inaequalis 

 (Hall), 1 but all the specimens are probably distinct from the 



1 Waller, Transactions of the St. Louis Academy of Sciences, Vol. X, p. 66, Plate i, 

 Fig. 18. 



