CETACEA—LILLIE. 123 
The type shown in Fig. 2 was seen on September 3, 1910, and October 18, 1910. 
The variety in Fig. 3 occurred on October 20, 1910, and on March 13, 1913. 
The type in Fig. 4 was noticed on October 7 and 12, 1910, and on October 6, 1911. 
The commonest form off the coast of New Zealand was type 3. 
16. Lagenorhynchus wilsoni, sp. nov. 
* An undescribed Dolphin,” Wilson, Nat. Antarct. Exp. 1901-1904, IT, Zool., ‘‘ Mammalia,” 
Pe 9, tgs i. 
December 5, 1910 . . 56° 41'S., 176° 23’ E. March 20,1912 . . 61° 49'S., 160° 04’ E. 
March 8, 1911 . -. 64° 23’S., 161° 39’ E February 2,1913 . . 61°18'S,, 157° 53! E. 
" One 62° 51'S.,160°55'E. | April 3, , . . 55° 11'S, 110° 21’ W. 
i" lp eeSe: 2048: 161° 22°F. |  ,, 7, » » . 55° 25'S., 88° 35’ W. 
_ eee 56-28) Si, 169° 58" E. | 
This dolphin would seem to be confined to a comparatively narrow band of the 
Southern Ocean, just north of the pack-ice, between Lat. 65° S. and Lat. 54°S. It 
was first described by the late Dr. E. A. Wilson when on board the “ Discovery” in 
1901-4. He called it the ‘ Hourglass Dolphin.” The specimens seen by the “ Terra 
Nova” were very like Wilson’s figures.* 
From what we could see of this dolphin, as it swam round the ship, it appeared to 
belong to the genus Lagenorhynchus, and | have named it after its discoverer. 
Dr. Liouville ¢ has identified this dolphin as Lagenorhynchus jitzroyi, Waterhouse, 
and it is possible that he may be correct, but until further evidence is forthcoming I 
am inclined to regard it as a distinct species, on the grounds that it appears to be 
slightly larger in size and has a more distinctly marked snout than L. jitzroyi. These 
two points, together with the striking coloration shown by Dr. Wilson, appear to 
justify the proposal to name this form in his honour. Wilson estimated the length of 
this dolphin at 8 to 10 feet, which I think is rather too great. My estimate for a 
number of specimens was about 6 to 7 feet. The leneth of L. jitzroyi is from 5 to 6 feet. 
I am only too well aware of the unsatisfactory nature of this method of naming 
species from external appearances alone, but until an expedition is organised to obtain 
specimens of dolphins for a critical examination of their external and internal 
characters, the nomenclature of many of the members of this family is likely to 
remain uncertain. 
* Wilson, E. A., op. cit., p. 9, Fig 7. 
} Liouville, J., op. cit., pp, 165-177, Pls. VIII. and IX. 
