Part II - State of New Jersey

(see, e. g., figs. 1-4 on pl. 1 and figs. 1-5 on PI. 3) differ from the formjust discussed in that the conch is narrower, the distance between thedorsum and the venter is relatively great, and the siphunele is generallylocated near t,he center of a median line (cf. test figs. 1C-E and2A-C). For this variety, &lorton's name "h'[a.ntil?~s] pevlatzrs" seemsqnite appropriate. It vas proposed provisionally in 1834 for internalmolds that are "abundant at Prairie Bluff, Alabama, . . . are rounderand less expan(1ed at the mouth, than those from Xe\v Jersey [that is:the holotype of E. (iekayi] and may possibly be distinct." >leek's name"Nat~til~~s Deknyi Alontanuensis", \vhic11 was proposed in 1876, sl~orrldmost probably be suppressed as a snhjeetire synonym of E. (leka!/iparlatzlnt (Norton), ~rhiah has priority. l'lie great majority of tliemany specimens of Eatreph0f:eras known from Georgia: Alat~ama, and3Iississippi are small, but nrc 11;1ve a few indir~id~ials from the PrairieBluff chalk of the last state ~vhich, ~vhen complete, \\.ere larger thanthe holotype of E. dekayi. \Vl~en tlie cone11 of at least some of t.he hfississippispecimens attainerl a diameter of t111out 20 mm., it began to expandfairly rapidly, and its sutlrres bee;lnle progressively more sinuous,particularly througl~ tlre cle~~elopme~rt of a sa(1rllc on the nn~bilicalshoul(1er (see pl. 67: figs. 1-3). Other sl~ecimens that occur in clirect,association with these are indeed similar to typical E. rleba!ji, and it.seelns reasonably certain that all slrorrl(1 he regarded as conspecific.We have a few specimens, again from both the eastern ;ind tlle western-interiorportions of the 1jnit1:d Ststes, in n.l~ich the concl~ is yetnarrower, the distance hetxveen the (lors~un and the renter is great, thesutures are consi(1erably more sinnolls, and tile sipl~urrcle is relativelyclose to the dorsum, csl~ccially (Illring early ontogenetic derclopment(see figs. 7-9 on pl. 67, and text figs. 1A and 1B). For t,his variety weare using Rcesidc's name "aleesen,se". ~vhich IT.;IS prolrose(l for specimensfrom the IJpper Cretaceous of >Iont,ana: \iTyoming, IJtah, andNew Mexico. We have not st,u(lie(l Ilceside's type material, but hisillustrations and descriptions indicate that he was dealing \vit.l~ speeimenslike those we hare uncler eonsideration. E. tlro~~ri Xeesirle seems tohaye been based on a single ir~~lividnal from tlre Upper CretaceousEagle sandstone of Montana, and ii appears to he more or lcss intermediatebetween typical X. deliayi n'ceae?ire and E. tlelca,!~i pcrlatan~being perhaps somemhat closer to t,l~e former than the latter.It should be noted that Reeside and especially Steplrcnson havecalled attention to the fact t,hat certain representativcs of E~~trephoccrnsfrom the lJppcr Cretaceous of Texas hare a flattened venter at£1111 maturity; and t.he latter author has proposed t,he n;irne E. plnnoventerfor them, stating that t,hey are also characterized by long eameraeand sligl~t,ly sinuous sutures. It is qnite possihle that tllis form: ofwhich me hare seen no representatives, should be regarded merely as:i r-arict,? of E. 17ekoyi. Ilo~vcver, it shoi111l 11e enl~)Iri~sizo~l that ~vl~etlrertl~c several forms \re hare discr~ssccl are to l)e tlror~ght of as rarieties01. s1)ecies is strictly II matter of opinion! nod 11ne about ~vl~ich \ve hareNEW JERSEY GEOLOGICAL SURVEY