bOLPHINS 263 



Mr. True also comments upon the "presence of an 

 area of bright colour rather hiq-h up on the side 



o o i 



between the dorsal fin and the flukes " as a mark of 

 Lagenorkynckus. It is, according to the last-mentioned 

 observer, nearest to Prodelpkinus (Clymenia}. 



The first species of the genus Lageiwrhynchus 

 obscurus, Gray* (Fig. 33), has the external form as 

 in acutus, but beak not distinctly marked off. Teeth, 

 30-32. Pterygoids in contact. Length, 5 ft. 6 in. 



This species is chiefly to be distinguished by the 

 absence of a distinct marked-off beak. This gives 

 to the dolphin an appearance not at all like that of 

 other species of the genus, and it has indeed been 

 referred to Prodelpkinus. But, as already mentioned, 

 these two genera are not very far apart ; it is a 

 southern form. 



Lagenorkynckus tkicolea, also named by Gray,f is 

 known from a single skull only. Its chief feature is 

 the large number of teeth (45) ; and it is on these 

 grounds that it has been admitted to specific rank. 



In Lagenorkynckus super ciliosus, Schlegel, \ the 

 teeth are 30. Vertebrae: C. 7 ; D. 13 ; L. 20 ; Ca. 

 33 = 73- Pterygoids in contact. 



This species, from the Cape of Good Hope, is only 

 known by a skeleton. 



* Spicilegia Zool., 1828, p. 2. 

 t Proc. Zool. Soc , 1 849, p. 2. 

 I Abhandl. in d. Gcbiet Zool., 1841, p. 22. 



