-
oncocerid found in Ontario. The s**** is a
faintly gibbous exogastric cyrtocone with
subparallel dorsal and
ventral profiles but
adorally converging sides...
-
found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for
being compressed...
-
Mingan Island. The s**** of
Minganoceras is a
slender depressed exogastric cyrtocone,
curved so that the underside, the venter, is
longitudinally convex and...
- type
genus for the Karoceratidae. The s**** is a compressed,
exogastric cyrtocone,
section sub ovoid. The
siphuncle is ventral, near the outer, externally...
- Penn, Ont.) The s**** of
Baeopleuroceras is a short,
rapidly expanding cyrtocone,
curved through at
least 90 degrees. The body
chamber is one half the...
- conch, of
Cyrtocycloceras is a
moderately expanding annulated exogastric cyrtocone, with
curvature like that of a
rocking chair rocker. Annulations, encircling...
-
North America. The s**** of
Laureloceras is a smooth, slender,
compressed cyrtocone or
gyrocone with the
venter more
narrowly rounded than the dorsum. Sutures...
- Quebec. The s**** of
Simardoceras is a
moderately expanding exogastric cyrtocone, said to
resemble a
rather large Oncoceras, but with a
siphuncle that...
-
generally characteristic of its family, the Paraphragmitidae, an
annulated cyrtocone. In the case of
Calocyrtoceras striated both
transversely and longitudinally...
- Quebec. The s**** of
Gaspocyrtoceras is a co****ly
annularted exogastric cyrtocone.
Curvature is upward, the
ventral side
convex in profile. Annulations...