476 Systematic Paleontology 



not known, but there is little reason to suppose that Weller was warranted 

 in uniting these large, convex casts with Conrad's smaller and less inflated 

 type. 



Occurrence. — Monmouth Fokmation. Bohemia Mills, Cecil County. 



Collections.- — Maryland Geological Survey, Columbia University. 



Outside Distribution. — Monmouth Formation. Navesink marl, New 

 Jersey. 



Anchuka pergracilis Johnson 



Anchura sp f (young) Johnson, 1898, Ann Rept. Geol. Survey of New 



Jersey for 1897, p. 264. 

 Anchura t pergracilis Johnson, 1898, Proc. Acad. Nat. Sci., Phila., p. 463, 



• text fig. 2. 

 Anchura pergracilis Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 22. 

 Anchura pergracilis Weller, 1907, Geol. Survey of New Jersey, Pal., vol. 



iv, p. 713, pi. Ixxxi, figs. 18, 19. 



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

 about eighteen and the spiral wohrls with fifteen 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 mm." — 

 Johnson, 1905. 



Type Locality. — Mount Laurel, New Jersey. 



Anchura pergracilis Johnson is well characterized by its relatively 

 small size, very slender outline, and numerous, sigmoidal costse. 



Occurrence. — Monmouth Formation. Brooks estate near Seat Pleas- 

 ant, Prince George's County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey. 



Outside Distribution.- — Magothy Formation. ? Cliffwood clay, New 

 Jersey. Matawan Formation. Woodbury clay, New Jersey. 



Anchura ( ?) monmouthensis n. sp. 

 Plate XV, Pigs. 2, 3 

 Description. — Shell rather large, quite heavy, multispiral, whorls of 

 the spire feebly inflated in the cast, the body whorl relatively high with 



