CETACHA—LILLIE. 119 
10. Mesoplodon australis, Flower. 
A skeleton of this whale was found on the beach at Great Exhibition Bay. 
near North Cape, New Zealand, in August, 1911. The skull and scapula were 
brought home. 
This species was founded by Sir William Flower* upon a skeleton from Lyall 
Bay, New Zealand. The chief characters of the skull in the type specimen are as 
follows :-—The rostrum is 18 inches long and narrow at its base ; basirostral groove 
present ; foramina for the infraorbital branch of the second division of the fifth 
nerve one behind the other; the palatines lie outside and free from the pterygoids ; 
the teeth are missing in the specimen, but the sockets are near the hinder edge of 
the symphysis. The species Jf haasti, Flower was founded upon a rostrum and 
mandible only, which were found on the east coast of the North Island, New 
Zealand.t The only points in which this species differs from the above are as follows : 
The rostrum is 225 inches long and more compressed ; the basirostral groove and pit are 
deeper. The height of the tooth in this species is 3°3 inches; its ereatest antero- 
posterior breadth is 3°9 inches; and its greatest lateral width 3 inch. 
The specimen from Great Exhibition Bay is almost identical with the type of 
M. australis, except that the rostrum is 20 inches long. The mandible and teeth are of 
the same shape as in J/. haasti, but the tooth is somewhat smaller. The height 
5 
of the tooth is 3 inches ; its greatest antero-posterior breadth is 2} inches; and its 
greatest lateral width is $ inch. 
It has been pointed out by Dr. H. O. Forbest that Sir W. Flower’s two 
provisional species, J/. australis and JM. haasti, are possibly only variations of JL. grayi, 
Haast, which is a well-founded species. 
Although I am inclined to agree with this author, that the differences between 
the three species are hardly specific, I have retained the species I. australis for the 
“Terra Nova” specimen until more material is available, without which it is not 
possible to arrive at a satisfactory conclusion with regard to the number of species 
which should comprise the rare Southern forms of this genus. 
DELPHINIDAE. 
11. Orcinus orca, Linnaeus. 
Orca gladiator, Bonnaterre. 
January 3, 1911 6 : - ‘ Off Cape Crozier, Ross Island. 
” 4, 5 ; : : Off Cape Evans, MeMurdo Sound. 
. 290 5 é 5 : ; 78° 12'S., 174° 44’ BE. 
»» 31,. 5, > : : : 78° 30'S., 170° 35’ W. 
* Flower, Sir W. H., Trans. Zool. Soc., Vol. X., Pt. IX., 1878, p. 415, Pl. LXXI., Fig. 1, 
Pl. LXXILI., Fig. 1. 
{, Dbid:, Pll DXOXT., Hig. 3; Pl. UXXIT., Fig. 3. 
t Forbes, H. O., Proc. Zool. Soc., 1893, p. 216. 
wr 
