Genus 7/2 /a 

 7. geoffrensis: Amazonian Dolphin or Boutu. Upper Amazon; 7 

 feet; long beak. 



Genus Pontoporia 

 P. blainvillei: La Plata Dolphin. Estuary of Rio de la Plata; about 

 5 feet. 



Genus Lipotes 

 L. vexillifer: Chinese River Dolphin. Ting Ling Lake, 600 miles 

 up the Yang-tse River; 7 feet 6 inches; slightly upcurved jaws. 



The Porpoise 



The small beakless Delphinidae, which have a triangular dorsal 

 fin and spade-shaped teeth, black above and white below; travels in 

 large schools. The word "porpoise" is derived from the French porc- 

 poisson, "pig-fish." Never larger than 6 feet. 

 Genus Phocaena 



P. phocaena: The Common Porpoise. Chiefly North Atlantic and 

 North Pacific; never larger than 6 feet. 



P. spinipinnis: Burmeister's Porpoise. Rare. La Plata round Horn 

 to Peru. 



P. dalli: Dall's Harbor Porpoise. Very rare. Alaska; less than 5 

 feet. 



P. truei: True's Porpoise. Japan; less than 5 feet. 



P. dioprica: River Plate to South Georgia. 

 Genus Neomeris 



N. phocaenoides: Finless Black Porpoise. Cape of Good Hope to 

 Japan. 



Genus Lissodelphis 



L. peronii: New Zealand and Tasmania; about 6 feet. 



L. brealis: North Pacific; about 8 feet. 



The Right Whale Dolphins 



The Whales with Teeth 



The toothed whales are big dolphins, and are on the average much 

 smaller than the Whalebone or Baleen toothless Whales. 



Family Physeteridae 



Subfamily Physeterinae 



27 



