Part II - State of New Jersey

lateral portions of the mantle secreted a relatively thick calcareousdeposit, which merged with the rest of the test, tended to fill the umbilicaldepressions, and thus formed a structure which some authorshave termed a "columella".In this species, the sutures characteristically do not form an annularlobe. However, in the specimen represented by test figure 1B tllcreseems to he a slight one. Except possibly in the extreme aclapical portionof the conch, there are about 15 to 17 camerae per volntion. In general,the length of the camerae increased progressively during ontogeneticdevelopment, though in the adoral portion of the phragmoconeof large individuals the septa are closely spaced, as is characteristic offully mature nautiloids.Remarks.-Several of the authors cited in our synonymy have comparedE. dekayi with certain Eurasian species, some of which, in ouropinion, are not very close. For example, of the forms originally describedfrom Britain, Nautilus elcgans Sowerby has sinuous ribs andsutures and is a cymatoceratid ; N. expaltsua Solverby is flattened ventrallyand laterally, is almost subangnlar ventrolaterally, and is mostprobably a paracenoceratid; and A'. intperdis Solverby has sutures anda general physiognomy mliiel~ indicate that it belongs in Conrad'sgenus Cin~omia.As has been noted by Foord and others, the Vancouver Island,European, and African specimens that have been referred to E. dekayisllould probably be thought of as representing distinct species. CertainCretaceous forms have, holirever, been described from abroad that areindeed reminiscent of the one under consideration and should be regardedas congeneric with it. These include E. lauerdei Durham of theupper Aptian of Colombia; h'autilus dlOrbignyanus Forbes of the"Cretaceous" of Chile; N. Belleropho?b Lnndgren of the Danian ofDenmark; N. Bouckardianus d'orbigny of the Senonian of Franceawl the specimens from Britain, continental Europe, and the Indiansubcontinent mhich have been referred to it; N. IVekayi Fame 1869,not Morton, 1833 of the Cretaceous of southern Poland; E. denkabenseSpath of the Upper Valanginian of South Africa (Uitenhage)i~nd the congeneric forms described by Spath in 1921 from the Senonianof the same general region (Zululand) ; Nautilus bla?~fordianus Kilianand Reboul of the Upper Cretaceous of the Antarctic region, etc.Occurrence.-This species, as me interpret it, is of widespread distributionin the Upper Cretaceous of the United States and has alsobeen recorded from the same general horizon in southwestern Canada.It is known from at least the following states and provinces: Ne~v Jersey,Delaware, Maryland, North Carolina, Tennessee, Georgia, Alabama,Mississippi, Arkansas, Missouri, Texas, Nev Mexico, Utah, Nebraska,South Dakota, Wyoming, Idaho, Montana, and Alberta or Saskatchewan.In the Cretaceous of New Jersey this species is not abundant, butit occurs in the Navesink marl and the Red Bank sand, both of theNEW JERSEY GEOLOGICAL SURVEY