BEACHIOPODA OF THE MAEL BEDS. 9 



young individual. But I judge from Dr. Morton's description that it is a 

 very distinct species, being small and distinctly marked with radiating striae, 

 which T. Harlani never is so far as I have seen. I should be much more 

 inclined to think T atlantica Morton more nearly related to Mr. Gabb's 

 T, Halliani. 



Formation and locality. — The species is confined, so far as I know, to the 

 top of the Lower Marl Bed and to the Middle Marls, not having been seen 

 to any extent in the lower beds and never in the upper beds, at least within 

 the limits of New Jersey. It has been found in the lower beds near New 

 Egypt, and in the middle beds at the same pits, where it is extremely abun- 

 dant through about eight feet of strata, also at Timber Creek, at Mullica 

 Hill, and at Kirby's marl pits, two miles southwest of Harrisonville, N. J., in 

 the amber deposit on Old Man's Creek. (G. F. Kunz.) The two latter 

 localities furnishing many specimens of the variety T. fragilis. It is found 

 in the middle layers at very many localities and sparingly throughout the 

 entire bed in New Jersey and in Delaware. It also occurs in South Car- 

 olina, as shown in Dr. Holmes' collection in the American Museum of Natu- 

 ral History, New York City, from Mazyck's green sands, at Saint John's, 

 and is marked by Dr. Holmes as Eocene, probably an error. 



Terebratuliua atlantica. 

 Plate I, Figs. 10-13. 



Terebratula atlantica Morton. Jour. A. K. Sci., Phil., 1st ser., Vol. YIII, p. 214. 



T. Halliana Gabb. Proc. A. X. Sci., Phil., 1861, p. 19. 



T. glossa Conrad. Am. Jour. Conch., Vol. Y, p. 42, PI. I, Fig. 22. Meek, 



Geol. Surv. N. J., 1868, p. 732. 

 TerehratuUna Halliana Gabb. Synopsis, p. 200. Meek, Geol. Surv. N. J., 1868, p. 724. 



Dr. Morton describes this species as follows: '^ Shell ovate, valves 

 equally convex, with numerous, distinct, and bifurcating striae, most promi- 

 nent on the umbo ; foramen large ; beaks not incurved. Length of the 

 largest specimen found, five-eighths of an inch ; width, half an inch." The 

 locality he gives as in the ferruginous sands at Woodward's farm. New 

 Jersey. 



I have seen a goodly number of this species from New Jersey; but 

 most of them have been smaller than the dimensions given by Dr. Morton, 



