1864. ] DR. J. KE, GRAY ON A NEW WHALE. 589 
of the vertebr, and especially the form of the neural arch. In 
both these particulars they much more nearly resemble the genera 
Balena and Eubalena. Under these circumstances I am induced 
provisionally to form for these bones a special genus, which I pro- 
pose to call 
Macueayius. It may be thus characterized :—The atlas-ver- 
tebree distinct, separate, with short, broad, truncated lateral processes 
occupying the upper two-thirds of the side of the body of the ver- 
tebra, the lower side of the body forming a section of a circle; 
the neural arch strong, with a high central ridge forming a distinct 
keel. 
The second, third, fourth, fifth, sixth, and seventh cervical verte- 
bree united into a single mass by their bodies and neural apophyses ; 
the upper lateral process rudimentary, more or less anchylosed ; the 
lower processes of the second and third cervical vertebre large, 
thick, short, truncated; the neural arches very broad and strong, 
united together, the anterior one forming a large broad, convex, hood- 
like body over those of the other cervical vertebree. 
I have named this genus after Mr. Macleay, the former Secretary 
of the Linnean Society, and his son William Sharp Macleay, two 
naturalists who have done so much for science. — To the latter every 
student of Whales must be indebted for his work on the South-Sea 
Sperm Whale and the very extraordinary Huphysetes grayii. 
I have ventured to make these fragments of an animal (as they 
may be called) into a genus; for I think we can only study the gi- 
gantic Whales as we study fossils, from the parts which are preserved 
tous. It is to be hoped that at some future time more perfect ske- 
letons will be collected and preserved ; and then the description of the 
geuus will be filled up. 
The form of the atlas at once distinguishes this genus from Cato- 
don, or the Sperm Whale. In that genus the atlas is oblong, trans- 
verse ; the lateral processes occupy the entire side of the body of 
the bone, and are truncated at the end ; the lower edge is gradually 
curved from the centre to the end of the lateral processes; the 
upper edge is rather shorter, the middle part over the neural arch 
being only slightly raised and keeled, and scarcely higher than the 
upper outer edge of the lateral processes. 
The genera of large Whales may be thus arranged, according to 
the form of the cervical vertebrae :— 
A. The atlas and other cervical vertebre united by the body and 
neural arches into one mass. 
a. The lateral processes of the atlas conical, on the upper part of 
the sides (see Cuvier, Oss. Foss. v. t. 26. f.18). Baleena. 
b. The lateral process of the atlas ruther broad, rounded, shorter 
below (see Cuvier, Oss. Foss. v. t. 26. f. 13). Eubaleena. 
ce. Lateral processes of the atlas and other cervical vertebre on 
lower edge of body. Hyperodon, Lagenocetus. 
