-
apically so as for form a well
defined hyponomic sinus, but are
without spoutlike or
spinose projections. Halloceras, from the
Lower Devonian, is a similar...
- longiconic, curved, and
coiled s****
which develop solid, hollow, and
spoutlike wings, frills, and spines; the
siphuncle being ventral,
mostly orthochoanitic...
- with a rimoportula,
identified by its
longer external process and the "
spoutlike teapot"-shaped tip of the
terminal rimoportulae.
Among species in the...
