Part II - State of New Jersey

132 CRETACEOUS FOSSILSMmtoniceras &. N. dclawarensc (blorton). Dane, 1929, ArkansasGeol. Survey Bull. 1, p. 62, pl. 10, figs. 1-2.Tezanites delawarensk (Morton). Roman, 1938, Les ammonites jurarsiqueset cretaches, p. 461.Menabites (Delawarella) dclawarensis (Morton). Collignon, 1948,Madagascar Service des Mines Ann. ghol., fase. 13, p. 64; fasc. 14,pp. 29, 44.Menubites (Delawarella) dclaw~rrensis (Morton). Groot, Organist, andRichards, 1954, Delaware Geol. Survey Bull. 3, p. 53, pl. 7, fig. 5.Description.-Collignon describes dclawarensk as a relatively thickammonite with three stages of development-a young stage with threetnbcrcles on each flank; an intermediate stage bearing five tubercleson each Rank, of ~vhich the second tubercle from the umbilicus is smalland pointed, the middle tubercle is large and on a strong rib, and thefourth and ventrolateral tubercles are elongated parallel to the ventralkeel; and an adult stage, in which the tubercles except the umbilicaland ventrolateral, weaken or disappear. In the adult stage the primaryribs are thick and massive, about 20 per whorl, concave forward. A fewof these continue to the venter as simple ribs hut more frequently diyideat the middle tubercle to make about 30 ventrolateral ribs.Remarks.-The species dela~irarellsk has been noted in the literatureas widely distributed over the world in the eiirly Campanian. It hasbeen conceived rather loosely, holvever, anct Collignonhas drastically restrictedit. Zle has also made it the type of a subgenus of a genus basedon a species from lladagasear. The material availal)le to the writer doesnot seem adequate to determine the validity of this procedure, but hehas adopted it as the best procedure available and leaves to time theultimate disposition of the questions involved.The three specimens figured hare all been previously illustrated byWhitfield, Weller, and Gardner and show three stages in developmentof the shell.Range in New Jersey-JIERCHANTVILLE : Burlington, Maple Shade, Cliffwood.Range outside New Jersey-Cross~vicks (Aferchantville and \Voodhury) : Chesapeake andDelaware Canal.Type.-Location unknown, probably lost. Locality: Deep Cut (nowSummit Bridge), Delaware.Genus Submwtoniceras Spath, 1926Genotype: lllortoniceras woodsi Spath, 1921.Spath's characterization (1926, Geol. Mag., vol. 63, p. 79) is as follows:"The Campanian forms differ from the earlier true Mmtoniceras* ' " chiefly in the more continuous keel and progressive decline ofNEW JERSEY GEOLOGICAL SURVEY