298 REPORTS ON THE STATE OF SCIENCE. 
is accepted, two isomerides are possible, namely, 
R MgR’ R MeR 
Nae Nae 
Br NS and gi7 ee 
whereas if Grignard’s formulation 
R | Mex 
R” NR 
is correct, no isomerism is possible. Tschelinzeff claims to have established 
the existence of isomerides. Grignard,! however, maintains that his for- 
mula permits of the conception of isomerides, and regards it as more 
plausible than Baeyer’s. 
Investigation of the Fauna and Flora of the Trias of the British Isles.— 
Fifth Report of the Committee, consisting of Professor W. A. 
HErpMAN (Chairman), Mr. J. Lomas (Secretary), Professor W. W. 
Warts, Professor P. F. KENDALL, Professor A. C. Szwarp, and 
Messrs. H. ©. Beastey, E. T. Newron, W. A. E. UssHer, and 
Dr. A, Sutra Woopwarp. (Drawn up by the Secretary.) 
[PLATES II. AND III.] 
THE increased interest now being taken in the Trias rocks, largely a 
result of the Committee’s work, has led to some very interesting dis- 
coveries during the past year. A rich assemblage of fossils has been 
described from the Lower Keuper of Bromsgrove by Mr. L. J. Wills, 
a new Dinosaurian reptile has been described by Dr. A. Smith Woodward 
from Lossiemouth, Elgin, and in the present report Dr. Smith Woodward 
contributes a paper on a mandible of Labyrinthodon leptognathus. The 
great find of footprints at Storeton in 1906 is likely to be repeated in 
1907, for in the autumn the footprint bed will be again worked and a 
larger surface will be exposed. 
There is a considerable amount of material in hand which requires to 
be reported on by specialists, and if the Committee is reappointed it 
hopes to accomplish this work in time for next year’s Report. 
/ Ona Mandible of Labyrinthodon leptognathus, Oven. 
By A. Smita Woopwarp, LL.D., F.R.S. 
Mr. 8. S. Stanley, F.G.S., has recently obtained from the Lower 
Keuper sandstone of Cubbington Heath, near Leamington, the greater 
part of a mandible of Labyrinthodon leptognathus, which he has generously 
presented to the British Museum. The specimen is interesting, not only 
on account of the rarity of such fossils in the English Keuper, but also 
as showing more clearly than heretofore the characters of the lower jaw 
* Bull, Sov, Chim., 1907 [iv], 1, 255. 
