  We present 29 optical spectra of the normal Type Ia SN 1998aq, ranging from 9
days before to 241 days after the time of maximum brightness. This
spectroscopic data set, together with photometric data presented elsewhere,
makes SN 1998aq one of the best observed Type Ia supernova at optical
wavelengths. We use the parameterized supernova synthetic-spectrum code SYNOW
to study line identifications in the early photospheric-phase spectra. The
results include evidence for lines of singly ionized carbon, at ejection
velocities as low as 11,000 km/sec. Implications for explosion models are
discussed.
