Part II - State of New Jersey

26 CRETACEOUS FOSSILSthe type, there are upon the last volntion, from one to four adclitionalraised, revolving lines in each of the interspaces between the largerribs. The basal margin of the last volution is angular, and the lowerside of the rfolution is 5at and marked mith t~bout eight or ten faint,raised, revolving lines. In the internal casts the sutural cavity is narrow,indicating a thin shell, the volutions towards the apex are convex?the more mature volutions becoming more and more quadrangular incross-section. (Weller)Range in Neu~ Jersey-WOODBURY: 18,19, 20, 24Type.-Lorillard, N. J., NJSIZ.Turritella merchantvillensis Weller 1907Plate 50, Figure 4Turritella nlerchantz;illensis, IVeller, 1907, p. 704, pl. 79, fig. 13.Turritella mef-cltantuGlensis, Groot, Organist and Richards, 1954, p. 50.Description.-The dimensions of a specimen incomplete at each extremityare : height, 60 mm. ; maximum diameter, 17 mm. ; angle of divergenceof the sides about 10"; number of volutions shorr-n, 9. If t11especimen were complete at the apical extremity, it would hc 75 mm. ormore in length, mith about 15 volutions. Suture moderately impressed,situated in the bottom of an angular groove; the surface of the volutionsmoderately convex from suture to suture, the greatest diameter belowthe middle so that the slope of the lower half is more abrupt than thatof the upper. Surface of the shell marked with 10 or 12 fine, raised, revolvingcostae, one of which, near the base of the volutions, is slightlystronger than the others; between the costae the surface is entirelycovered with much finer, raised, revolving lines. The internal casts havea narrow, almost closed sutural cavity, indicating a thin shell, and theyusually have a more or less indistinct, narrow, revolving band ahorcthe middle of the volutions; surface of the volutions ~noderately eonvex,sometimes tending to become lnore flattened in the more maturcportions of the shell. (IVeller)Remarks.-The most common gastropod found in the llerchantvilleformation. Usual occurence is that of internal casts.Range in New Jersey-MERCHANTVILLE : 8! 10,15,16,17Range outside New Jersey-Delaware.Type.- ?NEW JERSEY GEOLOGICAL SURVEY