

Maryland Geological Survey 427 



The known distribution of the genus is restricted to the Upper Cre- 

 taceous of the East Coast and Gulf Region of the United States. 



A. Posterior fasciole not sharply differentiated; axial cost* rounded. 



Yolutomorpha conradi 



B. Posterior fasciole sharply differentiated; axial costse a -shaped. 



Yolutomorpha perornata 



VOLUTOMORPHA CONRADI Gabb 



Plate XV, Fig. 8 



Yolutilithes conradi Gahb, 1860, Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 



iv, p. 300, pi. xlviii, fig. 10. 

 Fulguraria conradi Gabb, 1862, Proc. Acad. Nat. Sci., Phila. for 1861, p. 364. 

 Rostellites conradi Meek, 1864, Check List Inv. Fossils, N. A., Crel. and 



Jur., p. 21. 

 Rostellites conradi Conrad, 1S68, Cook's Geol. of New Jersey, p. 730. 

 Yolutomorpha conradi Gabb, 1876, Proc. Acad. Nat. Sci., Phila., p. 293. 

 Yolutomorpha conradi Tryon, 1883, Struct, and Syst. Conch., vol. ii, p. 166, 



pi. liv, fig. 27. 

 Yolutomorpha conradi Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, 



p. 71, pi. vi, fig. 21; pi. vii, figs. 1-4, ? 5. 

 Yolutomorpha gaooi Whitfield, 1892, Ibidem, p. 73, pi. vii, fig. 6; pi. viii, 



figs. 1-4. 

 Yolutomorpha conradi Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 25. 

 Yolutomorpha gabbi Johnson, 1905, Ibidem. 

 Yolutomorpha conradi Weller, 1907, Geol. Survey of New Jersey, Pal., vol. 



iv, p. 780, pi. xcii, figs. 6, 7; pi. xciii, figs. 1-3; pi. xciv, figs. 1-6. 



Description. — " Shell fusiform, tapering ; whorls about four ; spire 

 small and but slightly elevated ; upper side of the whorls subangular ; sur- 

 face markings unknown. From marks on the cast it was apparently orna- 

 mented by longitudinal ridges, crossed by revolving lines ; one fold on the 

 columella."— Gabb, 1860. 



Type Locality. — Crosswicks, New Jersey. . 



" Shell large, some specimens apparently attaining a length of 4£ in., 

 with a diameter of the largest volution of rather more than 1£ in. ; spire 

 short, or only moderately elevated, although the general form of the shell is 

 somewhat slender, the body volution, as viewed on the apertural side, 

 forms fully four-fifths of the entire length, even in the condition of internal 

 casts ; upper volutions compact, convex on the sides, and rather squarish 

 or suddenly rounded to the suture on the top ; body volution very large and 



