Pelagic Tunicata — Bary 
111 
FIG. 18. Occurrences and distribution of pelagic tunicates, in relation to temperature, about southeastern 
New Zealand, a— c, Salpidae; e—f, other tunicates. 
specimens were collected was 8.2 °C. at Station 
921, which is 1.1° C. lower than given by 
Thompson. As all the specimens were disin- 
tegrating (Essenberg, 1926b) it is possible that 
they had been carried into water below the 
lower limits of the temperature tolerance of the 
species. 
The infrequent and sporadic occurrences of 
the species preclude a completed picture of local 
distribution. The charts in Figures 18 and 19 
suggest it is being transported into coastal areas 
in intruding oceanic waters of subantarctic 
origin. Tokioka (1940) regards it as "this pure 
oceanic form,” and the plot of its occurrence 
