Foram estudados os estágios de desenvolvimento de Lucifer faxoni Borradaille ao largo de Santos, São Paulo, Brasil (24º16"S, 46º00W). A maturidade foi estabelecida em relação ao tamanho do somito pré-bucal As estações de maior abundãncia dos espécimes maduros, imaturos e larvais foram determinadas.

The developmental stages of Lucifer faxoni Boradaille were studied off Santos, São Paulo, Brazil (24º16'S, 46º00'W). The maturity was established and related to the pre-buccal smite length. The seasons of greater abundance of mature, immature and larval specimens were determined.

Pilarella longicornis gen. n., sp. n. (Copepoda-Arietellidae) collected over the bottom of the Brazilian continental shelf is described and its taxonomic position is discussed.

The genus Neoscolecithrix is redefined and its situation in the family is discussed. The division of the species of this genus into two groups, "kehleri" and "farrani", is proposed, based on marked differences in the type of the rostrum, in the mandible's gnathobase, in the maxilla 2 and in the legs, especially the fifth leg. Xanthocalanus watersae Grice (1972) is considered a species of Neoscolecithrix. The female and the male of N. caetanoi sp. n., collected off the Brazilian coast at 900 m depth, are described.