DOLPHINS 267 



Finally, Dr. Moreno* has described Lagenorkynchus 

 floweri, from the bay of St. Cruz. It is i m. 29 long, 

 with nearly the whole of the middle part of the body 

 white, the rest black. The teeth are 20. 



The genus SOTALIA has :- -Teeth, tolerably large, 

 26-35 in number in each jaw. Vertebrae : C. 7 ; 

 D. ir, 12; L. 10-14; C. 22 = 51-55 in all. The 

 pterygoids are separate. There are three elements 

 in the sternum, and there are five to seven pairs of 

 sternal ribs. The number of phalanges in the digits 

 is as follows: I, o. II, 6. Ill, 5. IV, 2. V, i. 

 Beak distinct. The manus is long, falcate, or oval. 

 The dorsal fin is falcate. 



Of this genus there are some five or six species ; 

 the exact number cannot be fixed at present. They 

 are not large dolphins. Eight or nine feet may be 

 regarded as the greatest length attained to. The 

 remarkable fact about the dolphins of this genus is 

 their usually pale coloration. Thus S. sinensis is 

 milky white with pinkish fins. The upper part of the 

 body in S. pallida is yellowish white, the under 

 surface white. S. plumbea is a uniform plumbeous 

 grey. A good many of the species, moreover, are 

 found in rivers and estuaries. In the Amazons and 

 other streams of South America are two recognised 



o 



species, and three more doubtful ones. S. sinensis 

 lives in several rivers of China. On the other hand, 

 there are others which are as purely marine in habit. 



* Revista Mus. la Plata, iii., p. 385. 



