THE RARITAN. 29 



More recently several examples of a small pelecypod, described 

 in this report as Cor'bula manleyi, have been collected by Mr. J. 

 M. Manley, of New Brunswick, from Furman's clay pits at 

 Sayreville. Other members of the genus Corbula occur in the 

 higher Cretaceous beds of the State, associated with typical 

 marine faunas, but C. manleyi is quite different from any of these 

 species. This same genus is living at the present time, some of 

 the species having a typically marine habitat, while others live in 

 brackish waters, and on account of this varying habitat of living, 

 members of the genus, the presence of this shell at Sayreville 

 does not certainly indicate the presence of marine conditions, 

 since this species may quite as well have been one of the brackish- 

 water members of the genus. 



Perhaps the most significant occurrence of invertebrate fossils 

 in any of these Raritan beds is a concretionary slab of sandstone 

 in the collection of the Geological Survey, collected from one of 

 the clay banks at Sayreville by J. H. Congar in 1883. This slab 

 is covered with many individuals of a species o<f Turritella (see 

 plate LXXX of this volume), which is similar to and perhaps 

 identical with a species occurring in the Cliffwood clay and 

 described in this report as T. jersey ensis. Upon the same slab is 

 an imperfect impression of a small pelecypod shell, which has the 

 general form and proportions of Cytnbophora lintea, a species 

 particularly abundant in the Cliffwood clay, and also occurring 

 in several of the higher Cretaceous formations in the State. 

 Both of these forms are typically marine, and their occurrence 

 here near the base of the Raritan series, and the reappearance of 

 the same or of closely allied species in the Cliffwood clays, and 

 again in the higher Cretaceous beds, affords evidence of the 

 presence, at no great distance, of marine conditions, with faunas 

 closely allied to those of the Matawan series, -throughout the 

 whole of Raritan time. 



