Maryland Geological Survey 495 



ardent little collector is often astonishing: Turritellce, Cardia an inch 

 and a half in altitude, Chamce, all are utilized by the enterprising uni- 

 valve. It is by no means uncommon among the recent forms for the 

 diameter of the shell to be doubled by the load that it carries. 



Xenophora leprosa (Morton) Whitfield 



Trochus leprosus Morton, 1834, Syn. Org. Rem. Cret. Group, U. S., p. 46, 



pi. xv, fig. 6. 

 Phorus leprosus Meek, 1864, Check List Inv. Fossils, N. A., Cret. and Jur., 



p. 18. 

 Onustus leprosus Conrad, 1868, Cook's Geol. of New Jersey, p. 728. 

 Xenophora leprosa Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 



135, pi. xvii, figs. 16-19. 

 Xenophora leprosa Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 21. 

 Xenophora leprosa Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 690, pi. lxviii, figs. 1-3. 



Description. — ■" Compressed ; spire composed of about four volutions, 

 presenting an unequal, rugged surface. Diameter from an inch to an 

 inch and a half." — Morton, 1834. 



Type Locality. — Prairie Bluff, Alabama. 



" Shell small or below a medium size, trochiform, or broad conical ; the 

 spire having an apical angle of less than 90° ; base flat or concave, usually 

 more or less depressed in the center, with the margin of the volution more 

 or less rounded, and in old individuals sometimes distinctly rounded ; 

 casts showing a small umbilical perforation, but the axis probably solid 

 in the shell ; volutions probably seven or eight, but in the casts the upper 

 ones are usually absent and seldom show more than four or four and a 

 half; one small specimen retaining the upper whorls, to the number of 

 four and a half, measures only five-eighths of an inch in diameter. This 

 one, if continued below to the size of the larger one figured, would possess 

 at least eight volutions ; whorls obliquely flattened on their surfaces in 

 the direction of the spire, with only a small portion of their edges rounded 

 or vertical, and the surfaces deeply and abundantly scarred by the cica- 

 trices of foreign substances which have been attached to the surface of the 

 shell during life ; aperture compressed, transversely ovate or trapezoidal, 

 and the outer margin much prolonged." — Whitfield, 1892. 



