1901.] NATURAL SCIENCES OF I'UILADELPIIIA. Ill 



CRUSTACEA OF THE CRETACEOUS FORMATION OF NEW JERSEY. 

 BY HENRY A. PILSBRY. 



From the earliest exploitation of the Cretaceous beds of New- 

 Jersey, remains of Crustacea have been encountered by various 

 observers, most of whom contented themselves with merely men- 

 tioning the occurrence of crabs' claws. These remains have until 

 now escaped scientific description. 



The first notice ot crustacean fossils from the State, so far as I 

 know, is contained in Vol. I, part 2, pp. 195-198, of the Annals 

 of the Lyceum of Natural History of New York (1824), where Dr. 

 J. Van Rensselaer gives a brief account and figures of four sup- 

 posed species from " the triangular peninsula comprised between 

 the ocean and the Delaware and Raritan rivers." The species are 

 not named, and from the information given cannot be identified with 

 certainty, but Nos. 1 and 3 may be Callianassa morioni, and No. 

 4 is possibly C. conradi. 



Dr. S. G. Morton, in the American Journal of Science and Arts, 

 XVII, No. 2, p. 287 (1830), notices Van Rensselaer's work, and 

 mentions the finding of Adacus remains in Delaware; paraphras- 

 ing his remarks in the Synopsis of Organic Remains of the Creta- 

 ceous Group of the U. S., p. 74 (1834). 



The collection of the Academy of Natural Sciences of Philadel- 

 phia contains many specimens from the deep cut of the Chesapeake 

 and Delaware canal, Delaware, and from Monmouth and Burling- 

 ton counties, N. J., together with numbers without locality further 

 than " Cretaceous, New Jersey." During the last few years various 

 members of the Academy have added specimens from Lenola, N. 

 J., a locality unknown to the earlier collectors of Cretaceous fossils. 



It is noteworthy that all the specimens thus far seen are from 

 the * ' Lower Marl ' ' beds ; none have come to my notice from the 

 Middle or Upper Marls. 



I am indebted to Mr. Charles W. Johnson, Curator of the 

 Wagner Free Institute of Science, for various references and the 

 use of material in the museum in Jiis charge, including specimens 



