NJGS - Bulletin 61-I. The Cretaceous Fossils of NJ - State of New ...

ANNELIDA 43
Ilalyminites major, Groot, Organist and Richards, 1954, Delaware
Geol. Surv. Bull. 3 p. 54, P1. 7, fig. 7.
These tuhes have been variously identified as worm tubes, mollusk
borings and remains of plant origin. They are widespread in Creta-
ceous and Tertiary formations. Tubes, apparently this species, have
been found in the Wenonah formation near Runnemede and Matawan,
New Jersey, and in the same formation in the banks of the Chesapeake
and Delaware Canal in Delaware.
Thinner and more fragile tuhes, possible referable to H. major
have been found in the Red Bank formation in Delaivare (Groot, et d,
1954 p. 54).
Tube or Burrow'
Plate 9, Figures 11,12
, Weller, 1907, p. 311, pl. 19, fig. 1.
, Groot, Organist and Richards, 1954, p. 54, pl. 7, fig. 8.
Tubes, somewhat less corrugated than those of N. major have been
found in the Red Bank formation in the Chesapeake and Delaware
Canal in Delaware and in the Red Bank and Tinton formations at Beers
Hill (63). Weller believed that these vere "probably the casts of the
burrows of some organism, probably one of the segmented worms."
Xenohelix? jerseyensis Ramsdell n. sp.'
Plate 90, figures 1,2 '
Description.-Specimen incomplete, the whorls at both ends having
been broken away. Specimen consists of two whorls forming a loosely
coiled, slightly tapering spiral ; whorls symmetrically and regularly
coiled and equally spaced, whorl outline elliptical in cross section.
Umbilicus-like depression at base of axis of coiling. A tubelike structure,
here designated the peripheral tube, circular in cross section,
extends around the outer margin of the spiral.
Dimensions and measurements.-length, 154 mm: ; maximum width,
98 mm. ; pitch of coiling, about 35" ; distance between coils, 50 mm.
Remarks.-Type specimen unique. This species differs from other
described species of this genus in the presence of the peripheral tube,
in the looseness of coiling, and in its greater size. This specimen varies
from those of Xenol~eliz mar#landica Mansfield and X.? utahensis Gilliland
and LaRocque in lacking in cross section, the two distinct part*
the peripheral wall and the central core-present in these latter species.
An impressed area remains where the peripheral tube has been broken
away from a portion of the upper whorl.
'by Robert C. Ramsdell.
'In Part I1
NEW JERSEY GEOLOGICAL SURVEY