336 Transactions.— Zoology. 
the comparison of the skulls described in my former paper, one of which is 
now in the British Museum and the other in the Colonial Museum, with the 
type from the Cape of Good Hope in the Paris Museum, which is described 
and partly figured by Van Beneden and Gervais, I feel no hesitation in 
identifying the New Zealand humpback with that from the Cape. 
4. PHYSALUS AUSTRALIS. 
Physalus australis, Desmoulins ; Dict. Class. H.N., II., 166. 
Balenoptera australis, Gray; Zool. Er. and Terr., pl. 51, 
, Sibbaldius antarcticus, Gray ; Cat. S. and W., 381 
Balenoptera antarctica, v. Beneden and Gervais, Ostéog., 234. 
? Physalus grayi, McCoy; Zool. and Palwont. of Victoria, p. 4. 
? Sibbaldius sulphureus, Cope; Proc. Phil. Acad., 1869, 20. 
Stenobalena xanthogaster, Gray ; Ann. and Mag. N.H., 1874, 305. 
Physalus australis, Hector ; Trans. N.Z. Inst., V., 157, VII., 257. 
The complete skeleton, seventy feet in length, of the great hen rorqual 
described in my former paper* has now been mounted in the Colonial 
Museum, and there are no osteologieal characters by which it can be 
distinguished from the great northern rorqual ( Physalus antiquorum, Gray, 
or Balenoptera musculus, Van Beneden and Gervais) of which I have 
examined skeletons in the museums at London, Edinburgh, and Turin. 
In its external characters, and especially in having a small dorsal lobe 
situated far back, instead of the high erect fin so characteristic of the 
northern Physalus, it resembles the broad-nosed fin-whale ( PAysalus sibbaldii ) 
figured by Turner,t but the short pectoral limbs, the form of the skull, 
and the number of vertebrz, 64,1 its fifteen ribs and great size readily dis- 
tinguish it from the genus Sibbaldius of the rorquals, which have 56 
vertebre and fourteen ribs and expanded maxillaries. 
As there is no other complete skeleton of the southern rorqual yet 
described, and the various species above quoted from the South Seas and 
the Pacifie Ocean have been founded on very fragmentary evidence, I think 
it better to combine them under the name by which the razorback was first 
recognized in the south. 
The specimen in the Melbourne Museum, quoted from Professor McCoy, 
appears to be the same, but it is not yet fully described, the chief point of 
difference noted being that it has 16 and not 15 ribs, which is the number 
in other skeletons of the species. 
Sibbaldius sulphureus, Cope, is only named from descriptions and draw- 
ings, and I have suggested it as probably the same as the southern species, 
on account of the resemblance of a skeleton which I obtained in San 
o * Trans. N.Z. Inst., 1875, VIL, 267. ł Trans. R. Soc. Ed., XXVI., 197. 
e" By an oversight the number of vertebre was formerly eem as 57, the seven 
pe versicals not having been included. ' * Trans, N.Z. Inst.," VIL, 
