Part II - State of New Jersey

14 CRET.4CEOTjS FOSSILSmiddle. In specimens preserving the shell, or in itnpressio~ls of the exterior,a distinct band of elevated crenulations or transverse nodesmarks the top of the rolutions just below the suture, and forms a decidedridge around the spiral portion of the shell. Surface of the shellmarked by fine lines of grolvtlt parallel with the margin of the aperture,and passing over the line of nodes on the upper surface of the volution.(IVeller)Renzarlis.-Since most of the Ncn Jersey !specimens of these speciesare poorly preserved easts, their identification often is uncertain.Range in Eew Jersey-MERCI-IAWrVILLE : 8, 10,15WoonBunP: 24WENONAII : 34Run!je ottlside Sezo Jersey-Delaware, North Carolina, Georgia, Alabalua, Mississippi, Texas.. Type.-(C. szipraplicatus) Crosswicks, N. J. Lost..(N. i?~f,meari?~atu) Crosswieks, N. J. ANSI' 15132.(G. erenofa) Tippah County, Miss. ANSP 1.5133.Gyrodes petrosus (Morton) 1834Piate 49, Figure 3 ; l'late 44, Figures 4, 5Fatica pelrosn Morton, 1834, Synop. Org. 1lem.Cret. Gr. U. S., p. 48,pl. 19, fig 6.Gyrodes petroszts Whitfield, 1892, p. 12'7, pl. 16, figs. 1-4.Gyrodes petrosus \?Teller, 1907, (part), p. 689, pl. 77, figs. 13-15 (notfigs. 16-18).Cyrodes petrostts Stephenson, 1941, p. 282, pl. 51. figs. 1-7.Gyrodes petrosiis Groot, Organist and Iticl~ards, 1954, p. 49, (not Gyrodespetrosss Gardner, 1916, p. 496, pl. 13, fig. 8 = G. szibcarinatusStephenson ?).Descriptios.-"Sl~cll (as seen in casts) of medium size or smaller,obliquely oval or depressed and somelvhat patnlose, with a low spire;the entire adult sltell having three to three and a half volutions, the lastof which forms the greatest bulk of the shell; volutions obliquely compressedfrom above, largest belox the middle, often slightly flattenedon the upper half and with a distinct flattened space bordering the suture;aperture large, very oblique, strongly receding below as seen inprofile on its edge ; semilunate in outline, rounded below and slightlyacute above, somewhat modified in the upper part by the intrusion ofthe preceding volution ; umbilicus large, broadly patulose within, andapparently without callus; peristome thin, and the substance of theshell also apparently, slight; surface of the shell unknc~mn." (Whitfield)The dimensions of an average-sized allult specimen are: lnaxirnr~mNEW JERSEY GEOLOGICAL SURVEY