260 INIA BOLIVIENSIS. 



anotlier very young one was also at the same time 

 examined. 



In form it resembles the Dolphins, hut the body is 

 shorter and more slender. The snout is in the form 

 of a long and very slender beak, almost cylindrical, 

 iind obtuse at its extremity. The lips reach as far 

 back as the line of the eye; the blow-hole runs 

 obliquely from before backwards, and opens so far 

 back as to be in the perpendicular over the pectoral 

 fins. The auditory opening is larger than is usual 

 in the Cetse. The pectorals are large ; the dorsal, 

 but little developed, is placed two-thirds dovm the 

 back ; the tail is deeply forked. It has about one 



hundred and thirty-four teeth - ; all are rough, 



and marked mth deep and interrupted furrows; 

 anteriorly they resemble incisors, posteriorly they 

 have an irregular mammalory shape, which is very 

 peculiar. The skin is fine and smooth ; the snout 

 is bristled sparingly with coarse and crisp hair : this 

 was seen also in the cub. The mother was seven 

 feet long ; and the males are said to be double that 

 size. Its colour varies : commonly it is a pale blue 

 above, passing into a rose colour beneath ; the tail 

 and pectorals are blue. Some are all over of a rosy 

 hue, others are blackish, and some are covered with 

 spots and streaks; the tints are paler when they 

 frequent the rivers, and darker when they retire 

 to the lakes. 



This species is found in all the streams which 

 traverse the immense plains of the province of 



