425 
male. So there can be little doubt that there are females of Hy- 
peroodon latifrons as well as males. 
It appears to be a northern species. As I have seen specimens from 
Greenland, the Orkneys, and the Coast of Lanarkshire, this is the 
most southern example that has yet occurred to me. It is also pro- 
bably a much larger species than Hyperoodon rostratum, as the skull 
from Greenland in the Newcastle Museum is 92 inches long, while 
the largest skull of H. rostratum that has come under my observa- 
tion does not exceed 60 or 65 inches. 
It is only necessary to examine the figure of the two skulls of 
Hyperoodon rostratum and H. latifrons in the Plate to the ‘ Voyage 
of the Erebus and Terror,’ to see how exceedingly different they are 
from each other, not only in the form of the skull, but also in the 
form of the lower jaw. The skull of H. Jatifrons not only differs 
from that of H. rostratum in the thickness and solidity of the frontal 
crest of the maxillary bones, but in the crest being much higher than 
the hinder part of the skull; while in all the skulls of H. rostratum 
I have seen, the crest is of the same height with the frontal ridge. 
As regards Hyperoodon rostratum, Mr. Beardsworth states his 
specimens to be a female and a young female. The specimen which 
was shot at Weston-super- Mare, Mr. Crotch informs me, is a female. 
I may also observe that the specimen of this species described by 
Mr. William Thompson in the Annals and Mag. of Nat. Hist. 1846, 
vol. xvii. p. 150, is said to be a male: its skeleton is now in the 
Belfast Museum. So there are certainly male and female of this 
species also known. 
Mr. Crotch has furnished me with the following measurements of 
the female specimen taken at Weston-super-Mare, which was exhi- 
bited at Bristol :— 
o 
® 
ial 
St 
5 
sah, Lema sap 21, ie WEE Reeee aloxs% B ~)n- 26 
From posterior origin of dorsal fin to insertion 
CACY re) en eo ane 
—" 
6 
1 
— in height sapiens ee g sil 
Hailanvigehatert 5 308K so sxee, Aina ted cies - 7 
aC HO Siglo: tists »a/sleverbicd an ae Hes 2 
Cloaca to insertion of tail................ 5 
Length of elogeal fold o...5.. 2 scj00<ais o's 0 2 
From anterior of cloaca to pectoral ........ 8 
enpth of nectar... sire ee hy ese 2 
Hezht of pectoral qin. 2d) 2 > tienda cna. -)..0 
of body at anterior end of dorsal.... 4 
of body at origin of tail .......... 1 
Brom gape to muggle)... 2% 2... ee ene 2 
Vertical height of forehead from gape ...... 1 
from insertion of upper jaw.. 0 
Bromieye ti papi ss oe ike sae sa bwin 2 
From eye to spiracle . Lepaeaiaist- ait apiece 
Girth at, the doraals . of: ..52..5..-03... 
SomokhowoancowooureS of 
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