Salpidae

The salps, Thalia democratica (Forskäl) (Text-fig. 3, A, B) and Ihlea magalhanica (Apstein) in both their solitary and aggregate forms, constitute a major part of the late summer and autumn plankton. They indicate the presence of oceanic water at the plankton stations. Thalia democratica occurs regularly and very commonly in January. From February until May the species is present in most samples but in greatly reduced numbers (Text-fig. 7). Ihlea magalhanica is the rarer species and occurs only in January and February (Text-fig. 7).