LAGEyORHYNCHUS. 125 



XI. LAGENORHYNCHUS. (Lrh.) 



Lagenorhynchus, Gray, Zool. Erebus and Terror, p. 34, 1846. 



Dr Gray gives the characters which distinguish this 

 genus from Delpli inns as follows : forehead low ; 

 beak short, depressed ; dorsal fin further back, 

 body attenuated behind ; end of skull broad, flat, 

 expanded. 



(1) Lagenorhynchus albirostrls. (Lrh. al.) 



(Wliite-beaked Dolphin.) 

 Delphinus albirostris. Gray, Ann. Mag. Nat. Hist., 1846. 

 Lagenorhynchus albirostris, Gray, Zool. Erebus and Terror. 



Colour, top of head and back black ; venter white, 

 mottled grey, sides dark grey ; tip of short beak, 

 upper lip, and skin of mandible white ; tip of beak 

 differentiated by a groove. Length 8 to 10 feet. 

 Dorsal fin black, falcate, high ; pectoral limb black, 

 short, falcate ; pterygoids short, broad, meeting 

 mesially. Vertebral formula C7Dj5orjgL.23or24Cd^3to4j, 

 = 88 to 92. Teeth numerous, acute. Beak half 

 length of skull. 



1. Skeleton, female, articulated, with dorsal and caudal fins, 



pelvic bones and hyoid. Length 7 feet 10 inches ; 

 vertebral formula C^D^gLCd. Length of animal about 

 8| feet. Accompanied by a calf 3 feet 11 inches long. 

 See Turner in Proc. Roy. Phys. Soc. Ed in., 1889, 

 vol. X. 

 Stonehaven, July 1888. Turner Collection. 



2. Skull, adult, with broken mandible; length l7i inches, 



breadth 9^ inches. Length of beak 8g inches, breadth 



