422 MR. W. H. FLOWER ON A NEW [Nov. 8, 
frontal; the teeth, thongh pointed at the tips, have a polished sur- 
face, and many of them are worn at the sides by the mutual action 
upon each other of the upper and lower series. In the other skull 
the ossification of the sutures is less advanced; the teeth show no 
signs of wear, and have a uniform slightly rugous or granulated sur- 
face. This skull differs from the other, as will be more particularly 
shown by the measurements, in having the facial portion and all the 
ridges and outgrowths of the cranium for the attachment of muscles 
much less developed in proportion to the size of the cerebral cavity. 
In all essential specific characters they agree. Unless otherwise 
expressed, the description and comparisons which follow refer to the 
adult skull. 
The skulls correspond in their general characters with those of the 
genus Orca, as established by Gray*. The “teeth conical, acute, 
large, occupying the whole edge nearly to the notch, permanent,” 
sharply differentiates them from all allied genera ; but the definition 
of Orca, as far as it relates to the intermaxillaries ‘‘ being one-half the 
width of the jaw-bones,”’ would not include them. Reinhardt has 
raised O. crassidens to the rank of a genus, under the name of Pseu- 
dorea ; and to this section our present skulls undoubtedly belong, 
though by a slight extension of the definition of the parent genus 
they might conveniently be included in it. The true affinities of 
the animal, however, cannot be satisfactorily decided without an 
examination of the characters of the remainder of the skeleton, which, 
with Mr. Crowther’s assistance, I hope before long to be able to make. 
The principal dimensions of the two skulls are as follows :— 
Adult. | Young. 
| [ul in. 
| Length from tip of beak to condyles ..-.-.+.++++-++eeeeees 234 | 201 
| Internal length of brain-cavity ......-s+eeeeeeeeseeeeeees 74 fh 
Length of beak (from a line drawn between the stm 112 93 
h smofighesstorthe tip). Ars seinen aleieltelets relate wiaiettetet=feleie le S 7 
‘Length from tip of beak to anterior margin of superior nares..| 14; | 12 
Length of palate (from tip of beak to posterior margin in| | 15 123 
He nC Gl lo ooagcenee.. soodg>oaeqno0 tscDmeU otc J | 
_ Length from tip of beak to hinder edge of posterior tooth ..... 9% 8i 
| Height of slull:at vertex ..-.--00-eceeeewsseserenceunere: 83 84 
| Greatest breadth (at zygomatic processes of squamosals)...... 13 11 
| Breadth of brain-case in parietal region......-..++.e++ee++s of 93 
| Breadth at supraorbital ridge ........-+essee sees nese eens 11¢ | 10 
| Breadth of the base of the beak, inside maxillary notch ...... 7k 64 
, Breadth of the middle of the beak ........---+.+s-eeeeeees 53 5t 
| Breadth of the two premaxillaries, with their intervening | 42 33 
| space at the middle of the beak ........-+ssss++eeeeee J é 
| Width of condyles... . 1... eee e eee eee eect eee ee eee! 52 43 
| Foramen magnum, height .......++sseeeee eee e ence eens 24 
1 Foramen magnum, Width.........++.+seneserececcsereess pas 2 
| Lower jaw, entire length of each ramus.....-.+++---+e-eees 19 164 
| Lower jaw, from tip to the posterior edge of last tooth ...... 93 81 
| Length of symphysis.....- 2. ses cesses e cece e ence ees 34 24 
| Height of ramus, at coronoid process... .++e+++es esse ee eeee Py tear | “7 ek 
‘Width, posteriorly, between outside of articular surfaces... -| 12} | 10} 
* Zool. Erebus and Terror: 1846. Cat. Cetacea Brit. Mus.: 1850, 
