HORNERSTOWN MARL. 157 



PELECYPODA. 



Ciicullaea sp. 

 Caryatis veto. Whitf . 



GASTROPODA. 



Two undetermined species. 



I42 2 . This bed, two feet in thickness, is a nearly black green- 

 sand marl essentially like that below, but it contains an abundance 

 of fossil shells, the following species being recognized : 



BRACHIOPODA. 



Terebratula harlani Mort. 



PElvECYPODA. 



Gryphaea dissimilaris n. sp. 

 Polorthus tibialis (Mort.). 



142 s . The highest bed at the Hartshorn marl pits is a green- 

 sand marl similar to that below, 2 T / 2 to 3 feet in thickness, but 

 with a distinctly greener color. It is filled with shells, all of 

 which are stained a yellowish color, and the examples of 

 Terebratula are much less common than in the bed below. The 

 only species recognized in the fauna are: 



BRACHIOPODA. 



Terebratula harlani Mort. 



PElvECYPODA. 



Gryphaea dissimilaris n. sp. 



Locality 160. Two miles north of Pemberton and a little over 

 I mile southwest of Juliustown, an exposure of the Hornerstown 

 marl has afforded the following fauna : 



BRACHIOPODA. 



Terebratula^ fragilis Mort. 



