FAUNA OF THE CLIFFWOOD CLAYS 325 



than those containing the plants described by Ho lick and Berry, 

 may be safely assumed. 



One of the most notable features of the fauna from these Cliff- 

 wood nodules is the great number of Crustacean remains. Nearly 

 every one of the concretions, when broken, yields the remains, more 

 or less fragmentary and crushed, of one of these creatures; indeed, a 

 crab of some sort seems to have been the nucleus around which every 

 one of these concretionary nodules in the clay has been formed. In 

 addition to the crustacean remains, which seem to represent several 

 species, the nodules have yielded a goodly number of mollusca, and 

 the following species have been more or less satisfactorily determined : 



PELECYPODA 



1. Ostrea sp. undet. At least two species of oysters have been 

 recognized in the Cliffwood fauna, neither one of which can be 

 identified with any of the species occurring in the other Cretaceous 

 beds of New Jersey. 



2. Anomia tellinoides Mort. 



3. Amusium sp. undet. This species is much larger than either 

 of the members of the genus previously recorded from New 

 Jersey, and it seems to be undescribed. It resembles in general 

 form some specimens of Camptonectes burlingtonensis Gabb, 

 but lacks the distinctive ornamentation of that shell. 



4. Mytilus oblivius Whitf. Although this shell attains a larger 

 size in the Cliffwood clays than any specimens observed from 

 the Wenonah sand, the only other horizon where it has been 

 observed, there seems to be no reason for considering the Cliff- 

 wood specimens as specifically distinct. 



5. Modiola sp. undet. A single imperfect specimen may be referred 

 here. It somewhat resembles the shell described from the West 

 as Volsella attenuata M. & H. 



6. Pteria petrosa Con. Whitfield saw but one imperfect specimen 

 of this species during the preparation of his monograph of the 

 New Jersey Cretaceous pelecypods, 1 and Conrad in his original 

 description mentions seeing but a single specimen from the Dela- 

 ware and Chesapeake Canal. In the Cliffwood fauna it is one 



1 Paleontology of New Jersey, Vol. I, p. 69; also Monograph, U. S. Geological 

 Survey, Vol. IX, p. 69. 



