1864. ] DR. J. E. GRAY ON BRITISH CETACEA. 227 
being, if anything, rather the broadest of the two, very unlike the 
lateral process of the same bone in Physalus. The neural arch high, 
acute, with a rather high subcircular canal for the spinal marrow. 
The body of the atlas vertebra oblong, transverse, with a subcylin- 
drical lateral process produced from the middle of the side. 
Balenoptera, Gray, P. Z. 8. 1847, p. 89. 
Balenoptera, § 1, Gray, Zool. Er. & T. 50. 
Pterobalena, part, Eschricht. 
Rorqualus, part, F, Cuvier. 
The lateral processes of the cervical vertebra are generally free 
and tapering at the tip; but some of them are sometimes united, 
forming a ring. Eschricht described those of the fifth and sixth 
vertebrae as sometimes united. In the specimen in the College of 
Surgeons the lateral processes of the sixth cervical vertebra are united 
on one side and free on the other. 
In all these cases the form of the processes are not altered; the 
end is only elongated and united. The cervical vertebre are some- 
times quite free, as is the case with Hunter’s specimen in the Mu- 
seum of the College of Surgeons. The second and third vertebrae 
are often united by more or less of the surface of the neural arches ; 
and this seems to be the normal state. In the specimens from Cro- 
mer, lately acquired by the College of Surgeons, the third and fourth 
cervical vertebree are united by the neural arches; and the second 
and third free. 
The elongated processes on the end of the front ribs have two muscles 
attached to them, one arising from each of the two neighbouring 
vertebrze, Eschricht, in his essay above cited, figured the foetus and 
a new-born specimen, which was 34 inches long, and gave the ana- 
tomy of it, with details of its skeleton (see Eschr. K. D. Vid. Selsk. 
1846, fig. p. 309). They have a single series of bristles parallel with 
the lips (see K. Dansk. Vid. Selsk. xi. t. 1. & 2). Tympanic bones 
oblong, swollen, rounded above and below and at each end. They 
are figured in situ in the skull by Eschricht in the ‘ Danish Trans- 
actions,’ vol. xii. t. 11. f. 2g in the feetus, t. 9. f. 2& 4g, & t. 10. 
f. 2g, in the more adult state. 
In the ‘ Royal Danish Transactions’ for 1846, Eschricht gives a 
detailed comparison of the bones of the head of a feetal specimen, 
and one 6 and one 34 feet long (see t. 9-11), and the details of the 
skeleton of a foetus 9 inches long (t. 14). 
It may be observed that the form of the cervical and other ver- 
tebree of the skeleton seems to be nearly identical with that of those 
of the adult animal. The lateral processes of the second cervical 
process, for example, are united into a broad expanded blade, with 
a perforation near the body of the vertebra, which is so characteristic 
of the genus. 
Batanoprera rostrata. The Pike-Whale. (Figs. 20-24.) 
Balena rostrata, O. Fab.? ; Hunter, Phil. Trans. lxxvii. t. 20-23; 
Turton, B. Fauna, 16; Nilsson, Scand. Fauna, 632. 
