210 DR. J. E. GRAY ON BRITISH CETACEA. [May 24, 
Fig. 7 a. 
Top of the First and Second Rib of Megaptera longimana. 
Kyphobalena boops, Eschricht, Nord. Wallthier. 1849. 
Megaptera longimana, Gray, Zool. E. & T.17; Cat. Cetacea, 36. 
Hab. North Sea; estuary of the Dee (7. Moore), young female 
skeleton in Derby Museum. (Greenland, Eschricht, skeleton in 
Brit. Mus.) 
Var. 1. The cervical vertebree are all free ; the second cervical is 
very thick ; the third, fourth, fifth, six, and seventh are thicker and 
of nearly equal thickness, the seventh being rather the thickest. 
The upper lateral processes are developed and nearly equal in all of 
them, those of the third and fourth being directed backwards, the 
fifth straight out; and those of the sixth and seventh are directed 
backwards at the end. The lower lateral processes are generally 
wanting ; the fourth and fifth vertebree have a rudimentary process 
on each side; the processes are of very unequal length on the two 
sides of the same vertebra, the largest not being more than an inch 
and a half long, and the rest mere rounded tubercles. The breast- 
bone is irregular, subrhombic, with a large central perforation. 
In a second imperfect skeleton in the British Museum, which had 
been mounted, the cervicals are all free. Fourth cervical like that 
in the Greenland specimen; but it has elongated, simple, straight 
lower lateral processes on each side. Seventh like the seventh in 
the Greenland specimen, without any lower lateral process. 
Sternum rhombic, without any central perforation. The tympanic 
bone is oblong, ventricose, smooth, very solid, with a rough depres- 
sion on the convex outer side. It is very like that of the genus 
Physalus, but shorter, more ventricose, and more solid. 
Var. 2. MoorEI. The second and third cervical vertebre very 
thin, anchylosed together by the body and neural arch. The body 
of the cervical vertebrae oblong, transverse, much wider than high. 
The neural arch rather slender, with a subcireular oblong cavity, 
which is fully two-thirds as high as wide. 
