-
found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for
being compressed...
-
oncocerid found in Ontario. The s**** is a
faintly gibbous exogastric cyrtocone with
subparallel dorsal and
ventral profiles but
adorally converging sides...
-
Mingan Island. The s**** of
Minganoceras is a
slender depressed exogastric cyrtocone,
curved so that the underside, the venter, is
longitudinally convex and...
- of Australia. The s**** of
Macrodomoceras is a compressed,
endogastric cyrtocone, i.e.
section higher than wide and
curved with the
ventral side concave...
-
generally characteristic of its family, the Paraphragmitidae, an
annulated cyrtocone. In the case of
Calocyrtoceras striated both
transversely and longitudinally...
- conch, of
Cyrtocycloceras is a
moderately expanding annulated exogastric cyrtocone, with
curvature like that of a
rocking chair rocker. Annulations, encircling...
- 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...
- Quebec. The s**** of
Simardoceras is a
moderately expanding exogastric cyrtocone, said to
resemble a
rather large Oncoceras, but with a
siphuncle that...
- of the
order Oncocerida,
Fayettoceras has a s****
which is a
depressed cyrtocone with a
ventral cyrtochoanitic siphuncle of
elongated ovoid segments strongly...
-
Middle Ordovician of
Nevada (USA), the s**** a
small slender exogastric cyrtocone with the
venter more
narrowly rounded than the dorsum,
resembling in overall...
