6 
Mammals 
Nine hundred thirty-nine mammals recorded in the Grid area (all but 
two were Cetacea). 
Dolphins 
This was the most abundant mammal in the Grid area with a total of 
677 individuals recorded. One specimen was obtained 27 August at 
34°20’ N, 126°27 f W. Complete measurements and photos were taken of this 
animal, and the skeleton roughed out and saved. 
Great variance in coloration of extremities has been noted during 
past surveys. During this survey the animals recorded had small amounts 
of n dirty white" in the dorsal and on the flippers, whereas those seen 
and photographed on earlier cruises had brilliant white markings. The 
explanation of the change is believed to be one of two factors: l) The 
mammals recorded in the area earlier have moved out of the Grid area, 
probably north or northwest, and those recorded on this survey were ar¬ 
rivals of another population (probably southern as northerly movements are 
evident); or 2) The white coloration is a secondary sexual characteristic 
which is becoming poorly defined in the "nonbreeding seasons." We have 
had extensive correspondence with Cetalogists on the West Coast and none 
can offer an explanation to this problem. 
Lissodelphus 
The appearance of this animal in the northern section of the Grid 
suggests that the southerly movements of the species are beginning. 
Orcinus 
A pod of 25- "killers" was seen at 3^°53 T N, 123°19 ! W. Loosely as¬ 
sociated with this pod were two animals which showed large amounts of 
albinism. The animals were chased for some time and well-observed. 
Photos were taken by tug crewmembers and hopefully will be of value. 
Whales 
Baleen whales still predominated in the area. The concentration of 
all whales was in the northern section of the Grid area. That the largest 
of the Balaenoptera are remaining in the area indicates relatively large 
planktonic concentrations in these northern waters. These large animals 
would leave unrich waters to seek food were it not abundant here. 
Non-Grid 
Observations are summarized in Table 8. The presence of large numbers 
of Sterna just outside the Grid near Point Ash is worthy of mention. All 
other interpretations are left to the reader if he will refer to Tables. 
