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We present 29 optical spectra of the normal Type Ia SN 1998aq, ranging from 9days before to 241 days after the time of maximum brightness. Thisspectroscopic data set, together with photometric data presented elsewhere,makes SN 1998aq one of the best observed Type Ia supernova at opticalwavelengths. We use the parameterized supernova synthetic-spectrum code SYNOWto study line identifications in the early photospheric-phase spectra. Theresults include evidence for lines of singly ionized carbon, at ejectionvelocities as low as 11,000 km/sec. Implications for explosion models arediscussed.Comment: 40 pages including 20 figures and 4 tables. Accepted by A

Optical Spectra of the Type Ia Supernova 1998aq