212 DR. J. E. GRAY ON BRITISH CETACEA, [May 24, 
maxille broad, with nearly straight outer margins. The second cer- 
vical vertebra (fig. 8) with two separate, broad, strong, nearly equal- 
sized lateral processes, which are rather expanded and truncated at the 
tip (as in Megaptera). The third, fourth, fifth, and sixth cervical 
vertebree with elongated slender upper and lower lateral processes, 
which are attenuated and separated at the end (not forming rings). 
The bodies of the cervical vertebree oblong, transverse ; the canal of 
the neural arch low, oblong, transverse, much wider than high. 
The scapula short, broad, with a strong, well-marked coracoid 
process. 
Vertebree 60. Ribs 15, all simple; the front ones compressed 
and dilated at the end; the first with a broad rounded lobe on the 
inner side ; the second with an elongate, slender, rounded internal 
process. 
This genus is only described from the skeleton of a young speci- 
men ; it combines the characters of Megaptera and Physalus. Its 
second cervical vertebra has the form of that of Megaptera; and it 
has the low neural arch and the oblong transverse canal for the spinal 
marrow, the blade-bone with the strong anterior process, the same 
kind of front ribs, and the short pectoral fins of the genus Physalus. 
It has been suggested to me by a comparative anatomist of con- 
siderable experience that perhaps the lateral processes of the cervical 
vertebree of this Whale might be lengthened in the adult age, and 
the end of the upper and lower processes united into a broad ex- 
panded plate as in the genus Physalus. 
In the skeleton of the small foetus of Balenoptera, only 9 inches 
long, figured by Eschricht in the ‘ Royal Danish Transactions’ for 
1846, t. 14. f. 2, the lateral processes of the second vertebra are very 
nearly of the same shape as in the adult, forming a broad expansion, 
with a perforation at its base. The cervical and other vertebree of 
this foetus seemed to agree, in all details of form, with the same 
bones in the adult. 
I do not deny that the lateral process of the first cervical vertebra 
may not be continued in cartilage, and be of the same form as that 
of the genus Physalus; but at any rate we have no proof, if this 
be the case, that the cartilage at the end ever becomes ossified in this 
genus any more than in the genus Megaptera, both genera agreeing 
in the equality of the thickness and strength and shortness of the 
lateral processes. 
BENEDENIA KNOXII. (Figs. 8, 8 a.) 
Physalus (Rorqualus) boops, Gray, P. Z.S. 1847, 91; Cat. Cetac. 
4] 
Hae North Sea; coast of North Wales, towed into Liverpool, 
1846; skeleton, 30 feet long, in the British Museum. 
Cervical vertebrze all free ; the upper lateral processes bent down ; 
the lower ones ascendant at the end, with a more or less acute angle 
on the lower edge near the base. The second cervical vertebra mode- 
rately thick. The third, fourth, fifth, sixth, and seventh rather thin, 
and all nearly of the same thickness. The upper lateral processes 
