MOLLUSCA. 713 



It is possible that this species should also include A. rostrata, 

 which differs chiefly in its smaller size. 



Conrad has illustrated a specimen from Snow Hill, N. Car., 1 

 under the name Anchura rostrata Mort, which he afterwards 

 corrected to Anchura pennata. 2 This shell, however, is distinct 

 from the one here referred to A. pennata, and probably represents 

 an undescribed form. 



Formation and locality. Navesink marl, Atlantic Highlands 

 (108), Middletown (H3 1 , H3 2 ), near Crawfords Corner 

 (i26 7 ), near Holmdel (i28 5 , 127), near Freehold (133), near 

 Walnford (148*), Crosswicks Creek (149, I47 3 , 147*, 195), 

 near Jacobstown (150), near Mount Laurel (166), Mullica Hill 

 (169), Freehold, Marlboro, Cream Ridge (Whitfield). 



Geographic distribution.* New Jersey, Alabama. 



Anchura pergracilis Johnson. 

 Plate LXXXL, Figs. 18-19. 



1898. Anchura ? pergracilis Johns., Proc. Acad. Nat. Sci. Phil. 



(1898), p. 463, text fig. 2. 



1905. Anchura pergracilis Johns., Proc. Acad. Nat. Sci. Phil. 

 (1905), p. 22. 



Description. "Shell fusiform, whorls convex, the body whorl 

 with about 18 and the spiral whorls with 15 equidistant, flexuous, 

 longitudinal ribs; numerous fine revolving lines, more prominent 

 between the ribs and somewhat obsolete on the angles of the ribs, 

 cover the entire shell; suture deeply impressed. The length 

 of the largest specimen (including the two apical whorls, which 

 are wanting), is about 20 mill." (Johnson.) 



Remarks. This species was based upon a young individual 

 upon which the expanded lip of the adult has not been developed. 

 It would be impossible to identify the species from internal casts, 

 the condition in which the New Jersey Cretaceous fossils are 

 usually preserved, but it can always be recognized from the 

 markings of the shell itself. 



1 Kerr's Geol. N. Car., App., p. 12, pi. 2, fig. 28. 



2 Proc. Acad. Nat. Sci. Phil. (1876), p. 275. 



