Part II - State of New Jersey

AMMONOIDEA 121t,at,c or coiled parts of t,he shell hart l~cen reportecl: so far as the writerknows. Though the sculpture of all these specimens is coarser thanthat of the type of conrrdi and much more stror~gly notled, these differencesare similar to those between the retroversal living chamber andt,l~e spire of t,he specimen of Did?j~noceraa illustrated by Ilyatt (1894,pl. 14, figs. 13-14) and do not alone prove a generic difference. Thcform of these living chambers is, however, like that of the living chamberof Nostoceras rather than that of Did2/moceras and presumably ofCirrocerm, and on another page they are referred to h'ostocerns.Range in New Jersey-NAVESINK: Arneytown, Atlantic Highlands.Type.-Apparentlytown.lost. Casts: ANSP 19495, USNN 1800, Arncy-Family Diplomoceratidae Spath, 1926Genus Solenoceras Conrad, 1860Genotype: TIamites annulifer Morton, 1841. (Not Solenocerns IIyatt.1884.)Stephensou (1941) describes species from Texas that give a morecomplete account of the genus than that provided by the genotype.Solenoceras annulifer (Morton)Plate 70, Figures 8-10Wamites annulifer Morton, 1841, Acad. Nat. Sci. Phila. Proc., vol. 1,p. 109.JIa)nites annulifer Morton. Norton, 1842. Acad. Sat. Sei. l'hila. Jour.,1st ser., vol: 8, p. 231, pl. 11, fig. 4.Solenocerm annulifer (Morton). Conrad, 1860, Acad. Nat. Sci. Phila.Jour., 2nd ser., vol. 4, p. 284.Solenocerm annzdifer (Morton). Gabb, 1861, Synopsis, p. 81 (25).Ptychoceras (Solenoceras) annulifer (Morton). Meek, 1864, CheckList, p. 23.Ptychoceras (Solenoceras) annz~lifer (Morton). Whitfield, 1892, p. 273,pl. 45, figs. 6-8.Solenoceras annulifer (Morton). Johnson, 1905, Acad. Nat. Sci. Phila.Proc., 701. 57, p. 26.Ptychoceras (Solenoceras) annulifer (Morton). Weller, 1907, pl. 107,figs. 7-9.Solenoceras annulifer (Morton). Stephenson, 1941, Univ. Texas Bull.4101, p. 398.Description.-The only specimen known is a nearly complete livingchamber preserving the last septum and part of the expanded ribs nearthe aperture. It is 21 mm. long and about 5 mm. in greatest diameter.NEW JERSEY GEOLOGICAL SURVEY