CETACEA. 101 



Delphinus caeruleo-albus, Meyen, Act. Nat. Cur. xvi. 609. t. 43. 



f. 2; Gray, Zool. E. $ T. 42; Reichenb. Cetac. Anat. t. 19, 



skull. 

 Inhab. East coast of South America, Rio de la Plata. 



Length 5 feet 6 inches. Skeleton in Mus. Anat. Mus. Berlin. 



Skull : beak J longer than the length of the brain-cavity, and 

 rather longer than double the width of the skull at the notch ; teeth 

 to the notch : see fig. Reichenb. 



5. LAGENORHYNCHUS ASIA. The ASIA. 



Skull : nose rather depressed, broad, flattened, rather contracted 

 in the middle of each side ; triangle concave, with a slightly 

 raised, flat, rugose space in the front half ; teeth f f , small. 



Lagenorhynchus Asia, Gray, Zool. Ereb. fy Terror, t. 14, skull. 

 Inhab. ? 



a. Skull. Teeth wanting. 



The specimen figured in the Voyage of the Erebus and Terror, 

 t. 14. 



The skull, which is without teeth, very much resembles in the 

 depressed and expanded form of the brain-cavity and shape of the 

 beak, the skull of L. Electra, but it differs from it in the beak 

 being rather more acute in front and more contracted on the 

 middle of the sides, and in being rather smaller in size. It may 

 only be a variety of that species. It measures as follows : 



Skull : Length, entire 16J inches. 



of nose 9 



of lower jaw . . 12| 



Width at orbit 8J- 



at notch 4f 



middle of beak . 3 J 



f>. LAGENORHYNCHUS ACUTUS. ESCHRICHT'S DOLPHIN. 



Body ? 



Teeth f \ ; nose of skull half its length and nearly twice as long 

 as wide at the notch ; lower jaw obliquely truncated in front. 



Delphinus (Grampus) acutus, Gray, Spic. Zool. 2, 1828, from a 



skull; Fischer, Syn. Mam. 656. 



D. Eschrichtii, Schlegel, Abh. 23. t. 1 &2. f. 4, t. 4. f. 5. 

 Delphinus leucopleurus, var. Nilsson, Skand. Fauna, i. 598. 

 Lagenorhynchus acutus, Gray, Zool. E. Sf T. 36. 

 Inhab. North Sea, Faroe Islands, Eschricht. 



