204 A BOOK OF WHALES 



Lagenorkynchus fitzroyi, Waterhouse '' ( = D. 



cruciger, Ouoy and Gaimard ; L. clanculus, Gray), 



has a length of 5 to 6 feet. Beak short. Dorsal 

 fin large. Teeth, 28. Pterygoids in contact. 



Whether the above synonyms relate to one and 

 the same species is far from a certainty. (Dr. Gray, 

 indeed, adds obscurus and superciliosus to the list.) 

 But in any case all the forms mentioned in the list 

 are from the shores of Patagonia and from the 

 southern ocean. They are also much patched with 

 white, and have, according to illustrations, much the 

 same external appearance. As mentioned before, 

 the discrimination of the different species of dol- 

 phins is a task beyond the capacities of those who 

 have not the entire museums of the world at their 

 command. 



The next species, Lagenorhynchus electra of Gray,f 

 has only twenty-three teeth in each jaw. Skull 

 massive. Rostrum broad, long, and flat. Mesethmoid 

 much ossified and visible superiorly. 



The four following names are probably to be re- 

 garded as synonyms : L. asia, Gray ; Electra obtusa, 

 Id.; Delphinus fusiformis, Owen ; P hoc ana pectoralis, 

 Peale ; of P. pectoralis only is the external form 

 known. 



This species appears to differ from all other 



* Zoology of " Beagle" Mamm., 1839, p. 25. 

 t Zool. > Erebus" and* Terror? 1846, p. 35. 



