470 DELPHINID^. 



CETA CEA . DELPHINID&. 



(ODONTOCETI.) 



WHITE-SIDED DOLPHIN. 



Delphinus acutus (J. E. Gray). 



Specific Character. Black above, white below, on each flank is a large 

 white stripe, which is continued above and behind by a yellow or brownish 

 band. Rostrum of skull slender and pointed ; teeth ||:^| to, |:| vertebrae 

 80 or 82, ribs 15 pairs. Length of adult 6 to 8 feet. 



Delphinus acutus, J. E. GRAY, Spic. Zool., 2 (1828). 



eschrichtii, SCHLEGEL, Abhandl. Zool., &c., p. 23 (1841). 



,, leucopleurus, RASCH, "Nova Spec. Descript.," &c., (1843). 



Lagenorhynchus ,, GRAY, Zool. Erebus and Terror, I., 34 (1846). 



acutus, ,, ,, ,, I., 36 ,, 



WE have followed the example of Nilsson, Eschricht, 

 and Lilljeborg, in considering the Delphinus leucopleurus 

 of Rasch to be identical with Dr. Gray's D. acutus; and also 

 with Schlegel's D. eschrichtii. They appear to agree in 

 all important points, both of external appearance and of 

 osteological structure. Dr. Gray first described D. acutus 

 from an Orkney skull, formerly in the collection of Mr. 

 Brookes and now in the Museum of Leyden ; while the 

 types of Herr Rasch's species were a large shoal which 

 occurred in the Christiania Fjord in 1843. 



Besides the Orkney example mentioned above, an 

 adult female was sent from the same locality in May 



