Pelagic Hyperiidea — Bary 
329 
Fathoms 0-49 50-99 I004-, 0-49 50-99 IOO 4 -. 0-49 50-99 IOO 4 -. 
Fig. 7. The average number of the commonly occurring Amphipoda per haul per month for January, February, 
and March, plotted together with the average number of species per haul over each of the ranges of depth 0-49, 
50-99 and 100+ fathoms (0-89.6, 91.4-181.1, and 182.9+ m.). 
waters and perhaps the several species were 
dependent on the particular hydrological con- 
ditions. That these examples of diurnal varia- 
tion are so weighted by a single haul indicates 
the need for a large number of samples when 
dealing with species exhibiting such variable 
distributions in time. 
Several quite considerable hauls made in 
daylight (Figs. 8 , 9) emphasise what appears 
to be a certain independence of controlling 
conditions (e.g., light intensity) in the vertical 
movements of the several species. Daylight 
hauls were scattered over a range of conditions 
(see Fig. 1) and thus it is unlikely that too 
frequent sampling in particularly favourable 
conditions is weighting the curves. Parathe- 
misto gracilipes and P. australis (Fig. 8) were 
most consistently present in daylight, the one 
or the other being captured at most times. 
P. gaudkhaudii, Parathemisto juveniles, Cyl- 
lopus magellankus , and Hyperoche mediterranea 
were usually taken in very small numbers 
during daylight (Fig. 8). It seems prob- 
able from the 2 -hour averages of all spe- 
Fig. 6. Charts of distributions of Amphipoda relevant to temperature for the east coast of South Island. Coastal 
species {a-c) are shown separately from Subantarctic species {d-f) for stations of Series 5 and 6. 
