25 right whale dolphins and 75 Risso's dolphins 

 was sighted 45 miles west- southwest of Point 

 Piedras Blancas; on 10 February 1961 , a mixed 

 school of about ZO right whale dolphins, 50 

 Risso's dolphins, and 25 pilot whales was 

 sighted 30 miles west- southwest of Point Pied- 

 ras Blancas. 



The right whale dolphin is said to be a 

 northern cold water form (Norris and pres- 

 cott, 1961), but the animal was only observed 

 off California. There it cannot be considered 

 as rare as published records would indicate. 

 Although most observations are confined to 

 areas occupied by Arctic waters, its distribu- 

 tion suggests a temperate rather than a 

 northern form. 



Lagenorhynchus obliquidens , Pacific striped 



dolphin (figs. 5 and 10) 



Pacific striped dolphins were observed on 

 135 occasions. The northernmost observation 



was off Point Grenville, Wash. (lat. 47°15'N., 



o 

 long. 124 14' W.). The number of striped dol- 

 phins in a group varied from 1 to 500+; groups 

 of 20 to 100 were common. 



Few striped dolphins were seen inside the 

 100-fm. or outside the 1,000-fm. curve. The 

 largest numbers of striped dolphins were seen 

 between San Miguel Island and San Francisco, 

 an area extensively covered each year. In 1959, 

 concentrations of this species were observed 

 2 5 miles southwest of Santa Rosa Island, 30 

 miles south of Point San Luis, 35 miles south- 

 west of Point Sur, off Monterey, and off the 

 Farallon Islands. At the time of observations, 

 anchovy schools were abundant in these areas. 

 Many other marine mammals and birds were 

 also present. Again in 1961 concentrations were 

 observed off the Farallon Islands and Monterey. 

 On one occasion a mixed school of about 400 

 Pacific striped dolphins and more than 100 

 common dolphins were observed 20 miles west 

 of Morro Bay. North of San Francisco, only 

 occasional small groups of Pacific striped 

 dolphins have been seen. It has not been ob- 

 served in Alaska waters from fur seal investi- 

 gation vessels. We collected five Pacific 

 striped dolphins as follows: 



Tac 59-1 PStr . --Female, apparently nul- 

 liparous, numerous follicles in both ovaries; 

 14 February 1959; position, lat. 35° 16' N., 

 long, 121 35' W., about 35 miles west of 

 Morro Bay; single animal sighted. Tooth 

 count: upper jaw--right 25(3)28, left25(3)28; 

 lower jaw--right 26(3)29, left 26(3)29. 

 Stomach contents: trace of squid. 



Tac 59-2 PStr . --Male, testes 13.5 by 40.0 

 mm.; 22 February 1959 ; position, lat. 

 35°28' N., long 121°38' W., 40 miles north- 

 west of Morro Bay; three in group. Tooth 



count: upper jaw--right 28(2 )30, left 29(2 )31; 

 lower jaw--right 29(2)31, left 29(2)31. 

 Stomach contents (volume 1,600 cc .); 95 per- 

 cent anchovy, 5 percent hake ( Merluccius 

 productus), and trace of squid. 



Tac 59-3 PStr . --Female, nuUiparous, 

 barely visible follicles in left ovary; 27 

 February 1959; position, lat. 35°42' N., 

 long. 121° 41' W., 20 miles west of Point 

 Piedras Blancas; 20 in group. Tooth count; 

 upper jaw--right 29(2)31, left 28(3)31 ; lower 

 jaw--right 31(2)33, left 30(2)32. Stomach 

 contents (volume 33 cc.); 50 percent squid 

 and 50 percent anchovy remains. 



Tac 59-4 PStr .--Female, multiparous, 

 follicles in both ovaries; 5 March 1959; 

 position, lat. 36° 58' N., long. 122° 53' W., 

 47 miles west of the city of Santa Cruz; 20 

 in group. Tooth count: upper jaw--right 

 30(2)32, left 29(3)32; lower jaw--right 

 28(2)30, left 29(2)31. Stomach contents (vol- 

 ume 1,090 cc): 45 percent squid ( Gonatus 

 sp.), 45 percent anchovy, and 10 percent hake, 



MS 59-1 PStr . --Male; 4 March 1959; 

 position. 36" 55' N., 122 41' W., 20 miles 

 west of Santa Cruz. Stomach contents : trace 

 of squid. 



Orcinus orca, killer whale 



(figs. 6 and 9) 



Following Norris and Prescott (1961) we use 

 the specific name orca rather than rectipinna. 



We collected an adult male killer whale 9 

 March 1961, 13 miles off the Farallon Islands, 

 Calif, (lat. 37° 29' N., long. 122° 58' W.). 

 Tooth count: upper jaw--right 11, left 11, to- 

 tal 22; lower jaw- -right 12, left 12, total 24. 

 Stomach contents: The animal had not fed im- 

 mediately before capture and we found no flesh 

 in its stomach. The 2 gallons of material in its 

 stomach consisted of two pellets of birdshot 

 and some less easily digestible parts of 

 several animals. These parts can be divided 

 into seven categories: 



1. Fragment of a hide 83 by 35 cm. and 6-10 

 mm. thick. The hair is short, averaging about 

 6 mm. long; individual hairs are stout and 

 sword shaped. The overall color is grayish 

 brown. The skin was compared with skin 

 samples from Callorhinus , Zalophus , Eumeto- 

 pias, Phoca , and Mirounga . It most closely 

 resembles Mirounga. 



2. Claws: 5 claws believed to be from a sea 

 lion (species ?) and 36 claws believed to be 

 from 4 elephant seals. 



3. Vibrissae: 28 vibrissae from one or 

 more elephant seals and numerous vibrissae 

 representing one or more sea lions. 



12 



