ACKNOWLEDGMENTS 



Specimens were collected and examined 

 through the cooperation of the owners, captains, 

 and crews of the tunaboats Carol Virginia, Conte 

 Bianco, Connie Jean, Conquest, Anne M, Pacific 

 Queen, and Queen Mary. C. J. Orange, J. S. 

 Leatherwood, and G. D. Sharp collected speci- 

 mens. D. W. Rice provided the photographs 

 used in Figure 3. J. H. Prescott provided photo- 

 graphs used in Figure 8. K. S. Norris provided 

 photographs used in Figure 24, and arranged for 

 a visit to Hawaii to observe wild and captive 

 spinner porpoise. I am indepted to Bonnie 

 Dalzell for the ideas concerning the possible sig- 

 nificance of the canted fin and ventral keel in the 

 eastern spinner. K. S. Norris, E. D. Mitchell, 

 D. W. Rice, C. 0. Handley, Jr., and D. K. Cald- 

 well read the manuscript. E. D. Mitchell oflFered 

 especially valuable criticism. 



LITERATURE CITED 



FISHERY BULLETIN: VOL. 70, NO. 1 



Figure 18. — Adult whitebelly spinner. Male, 

 177 cm, from 9°47'N, 133°25'W, August 11, 

 1970. Perrin field no. WFP54; U.S. National 

 Mu.5eum 396032 (complete skeleton). Photo- 

 graphed after frozen for several months and 

 thawed in water. 



Figure 19. — Adult whitebelly spinner. Male, 

 178 cm, from 10°N, 128° or 136°W, August 

 10-12, 1970. Perrin field no. WFP52; U.S. 

 National Museum 396030 (complete skeleton). 

 Photographed after frozen for several months 

 and thawed in water. 



Figure 20. — Dorsal surface of flipper of speci- 

 men depicted in Figure 17. 



Figure 21.— Ventral surface of flipper of speci- 

 men depicted in Figure 19. 



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996 



