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

CRETACEOUS ANNELIDA OF NEW JERSEY
by
B. F. Ho-
CLASS CHAETOPODA
Family Serpulidae
Serpula circularis Weller 1907
Plate 4, Figure 1
Serpula circularis, Weller, 1907, p. 307, pl. 19, figs. 5-6.
Description.-Tube rather lwge, moderately thick, increasing grad-
ually in size, the increase being more rapid as it approaches the aper-
ture, not closely coiled, the first volution of the type specimen forming
a rather large irregular circle, after which the shell is in contact for
about one-fourth volution nearly to the aperture. Another specimen
is perhaps not in contact at all. Aperture more or less subcircular or
subelliptical in outline. The surface of the shell is marked by more or
less irregular, annular lines of growth.
The dimensions of the type species are: greatest diameter of aper- ,
ture, 8 mm.; length of tube, 72 mm. ; greatest diameter of space within
first volution, 13 mm.
Remarks.-The type specimen is the only individual observed which
is anywhere near complete, though other fragments indicate that the
large open coiling of the tube was a common habit of growth. The type
specimen was apparently attached to some large shell, probably a
f3ryphaea, during life, by the flatter side. The species is rare, being
known only from the specimens described by Weller in 1907.
Range in New Jersey-
MARSHALLTOWN: 28
Tape.-Swedesboro ; NJSM ; 7712.
Hamulus falcatus (Conrad) 1869
Plate 4, Figures 3,4, 6,7,9-11
Dentalium fdcatum, Conrad, 1869, Am. Jour. Conch., vol. 5, p. 44, pl. 1.
figs. 12 and 16.
Dentalium falcatum, Whitfield, 1892, p. 169, pl. 20, figs. 12-17 (not
fig. 18).
Hamulus falcatus, Weller, 1907, p. 309, 22, figs. 11-12.
Eamulus falcatus, Howell, 1943, p. 152, pl. 19, figs. 14-28.
Description.-Tube curved in a half circle are in its earlier stages
of growth, but becoming gradually less bowed in later stages and almost
straight in the latest stage. The curvature of the tube is all in one
NEW JERSEY GEOLOGICAL SURVEY