- the Poterioceratidae, a
family of
subcircular to
compressed exogastric cyrtocones without a
hyponomic sinus.
Mecynoceras has a compressed,
gibbous cyrtoconic...
- (Gasconadian) of
North America. The
Dakeoceras s**** is an
endogastric cyrtocone with the
siphuncle on the concave, ventral, side;
moderately curved and...
- in Nova
Scotia and Quebec. S**** are depressed,
irregularly annulated cyrtocones with V-shaped
hyponomic sinuses,
ornamented by
longitudinal and transverse...
-
Teichertoceras is
moderately compressed, the
early portion a
narrow expanding cyrtocone that in the
adult become more swollen,
taking on an
exogastric aspect...
-
juvenile portion of an
ascocerid consists typically of a narrow,
circular cyrtocone that
underwent periodic truncation. ****ulative length,
including broken...
- Quebec. The s**** of
Simardoceras is a
moderately expanding exogastric cyrtocone, said to
resemble a
rather large Oncoceras, but with a
siphuncle that...
- 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...
- Quebec. The s**** of
Gaspocyrtoceras is a co****ly
annularted exogastric cyrtocone.
Curvature is upward, the
ventral side
convex in profile. Annulations...
-
North America. The s**** of
Laureloceras is a smooth, slender,
compressed cyrtocone or
gyrocone with the
venter more
narrowly rounded than the dorsum. Sutures...
