MARYLAND GEOLOGICAL SURVEY 297 



Occurrence. MARTIXSBURG SHALE (Eden and Fairview divisions). 

 Jordans Knob, one and one-half miles northeast of Fort Loudon, Penn- 

 sylvania, and the west slope of Bickard Mountain, Washington County, 

 Maryland, have afforded poorly preserved specimens. 



Collection. U. S. National Museum. 



Family EUOMPHALIDAE Dekoninck 



Genus MACLURITES Lesueur 



MACLURITES AFFINIS (Billings) 



Plate XXXIII, Figs. 8, 9 



Maclurea afflnis Billings, 1865, Pal. Fossils, vol. i, Geol. Surv. Canada, p. 238, 



text figs. 224a, b. 

 Maclurea afflnis Whitfield, 1897, Bull. Amer. Mus. Nat. Hist, vol. ix, p. 180, 



pi. iv, figs. 8, 9. 



Description. Shell 35 to 50 mm. in width and 12 to 16 mm. in height 

 with a flat spire of four or five slender whorls, uniformly convex on the 

 upper side, and with deeply impressed sutures. Umbilicus about three- 

 fifths the width of the shell, with the edge, as shown in a vertical sec- 

 tion, acute ; the inner sides of the whorls, in the umbilicus, convex. Sur- 

 face unknown. 



Occurrence. BEEKMANTOWN LIMESTONE (Cryptozoon steeli zone). 

 Vicinity of Hagerstown and Williamsport, Maryland. Canadian of 

 Newfoundland and Vermont. 



Collection. TJ. S. National Museum. 



MACLURITES MAGNUS Lesueur 



Plate XXXIX, Figs. 12-15 



Maclurites magna Lesueur, 1818, Jour. Acad. Nat. Sci. Philadelphia, vol. i, 



p. 312, pi. xiii, figs. 1-3. 

 Maclurea magna Hall, 1847, Pal. New York, vol. i, p. 26, pi. v, figs, la-e; 



pi. v, (bis), figs. la-c. 

 Maclurites magnus Raymond, 1908, Ann. Carnegie Mus., vol. iv, p. 199, pi. 1, 



figs. 1, 2; pi. li, figs. 1, 2; pi. lii, figs. 1-4. 



Description. " Sinistrorsal, discoidal, depressed turbinate ; breadth 

 more than twice as great as the height ; spire flat, a slightly depressed line 



