cSgo.] NEW-YOUK MICROSCOPICAL SOCIETY. 47 



The above are figures of two genera of Foraminifera from the upper 

 beds at Timber Creek, alluded to in the paper. I am not aware that any 

 attention has hitherto been paid to the fossil foraminifera of American 

 Cretaceous strata, to which I find no allusion in Dr. Morton's works. 

 They are very abundant in the coralline rock of Timber Creek. Mr. 

 Forbes has examined some of them for me, and these belong lo the genera 

 Crislellaria, RotalLita and A/'odosaria, All these genera occur in the 

 chalk of Europe. One of my American species of fossil Crislellaria is 

 specifically identified by Mr. Forbes with C. rotulata of d'Orbigny, which 

 occurs in England, France and Germany, ranging from the upper green- 

 sand to white chalky It is another instance of species found most abun- 

 dantly in Europe, recurring in American chalk. There are two other 

 species of the same genus at Timber Creek, one of them very large. 

 There are two species of N'odosaria. The Roialiiia^ which is very abun- 

 dant, is closely allied to species of our chalk. 



1845. Chas. Lyell. Travels in North America, i. 64. 



He found, in the upper, or straw-colored limestone, on the banks of the 

 Timber Creek, twelve miles southeast of Philadelphia, si.x species of 

 corals and several echinoderms, chietly allied to upper cretaceous 

 forms. The same calcareous stratum also abounds in Foraminifera, 

 characteristic of the chalk, comprising, among others, the genera Cris- 

 lellaria, Rotalina and Nodosaria, 



1S56. J. W. Bailey. On the Origin of Greensand, and its 

 formations in the Oceans of the present epoch. Proc. 

 Bost. Soc. Nat. Hist., v. 365, 366. 



The formation of the Greensand consists in a gradual green-colored, 

 opal-like mass, which forms therein as a cast. It is a peculiar species of 

 natural injection, and is often so perfect, that not only the large and 

 coarse cells, but also the very finest canals of the cell-walls, and all their 

 connecting tubes are thus petrified, and separately exhibited. Cy no arti- 

 ficial method can such fine and perfect injections be obtained. 



He mentions among his observations, that the yellowish limestone of 

 the cretaceous deposits of New Jersey occurring with Teredo tibialis^ etc. 

 at Mullica Hill, and near Mount Holly, is very rich in greensand casts of 

 Polylhalamia and of the tubuliform bodies above alluded to. 



i860. W. M. Gabb. Descriptions of New Species of American 

 Tertiary and Cretaceous Fossils. Journ. Acad. Nat. Sci., 

 ser. 2. iv. 402, 403, pi. Ixix. figs. 40, 41. 



I have recognized a number of species of foraminifera, in a marl from 

 near Mullica Hill, N. J., of the same age as Timber Creek limestone 

 (upper part of No. 5 of Meek and Hayden,) abounding in corals, the 

 most common of which is Eschara digitata. The matrix is fortunately not 

 so hard as that at Timber Creek, and both the corals and foraminifera are 

 much better preserved. I shall not describe any at present, e.xcept the 

 beautiful Dentalina, given below. I expect, however, at some not very 



