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(to appear in Probus)In Catalan vowel epenthesis and consonant deletion seem to have a different conditioning in simple words, in verb-clitic or clitic-verb sequences, and in clitic-clitic sequences (where an emergence of the unmarked effect with respect to syllable structure is found). In this paper, it is argued that, in spite of these domain effects, which would suggest the need for a serial analysis, all the facts concerning epenthesis and consonant deletion can be accounted for in a parallel optimality-theoretic approach. The differences in behavior are the consequence of the different ranking of morphological Alignment constraints with respect to other constraints and an Alignment constraint that makes reference to subsyllabic constituents.

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In current phonological feature theories, the behaviour of glottals poses serious problems for their representation. The special status of / h / and /? / which are often transparent to vowel harmony processes (cf. Steriade 1987; McCarthy 1991, forthcoming; Stemberger 1993), has led to the hypothesis that, at least in some languages, they lack a place node. The representation of ejectives and implosives, though, is very rarely discussed in the literature. On phonetic grounds, the main difference between plain stops and ejectives and implosives is the airstream mechanism used during their realisation, the former having a pulmonic egressive airstream while the latter involve a supplementary glottal constriction, which may accompany either egressive airflow, as in ejectives, or ingressive, as in implosives.