Notices of Memoirs—C. D. Sherborn—Index Animalium. 509 
since the latter pass into the former. Hence, if a pair of overthrusts 
dip towards one another, it is highly probable that the area they 
enclose was primarily a syncline, or, on the other hand, if they dip 
away from one another, an anticline. Thus, from the direction of the 
two great series of thrust-planes which form the north-western and 
south-eastern boundaries of the Grampians it seems probable that that 
region began its tectonic history as a syncline, while the central 
lowlands, on the other hand, would seem to have been a corresponding 
anticline. 
It will be observed that the Central Lowlands now form a broad 
syncline. But that is just what should be expected. From a 
consideration of what has already been said it should be clear that the 
original folds tend to become virtually reversed, the axes of the 
synclines raised, and the summits of the anticlines depressed. 
No doubt, from the premises that the form of a minor fold is 
influenced by the side-shift of superposed beds caused by the formation 
of a larger fold in which it is contained, many more interesting 
deductions might be drawn, but enough has, I think, been said to 
illustrate the nature and general effect of that influence. That the 
relation here stated is the only cause of the deformation of minor 
folds I would not wish in any way to suggest. The series of strains 
and stresses set up in the terrestrial crust must be more complex than 
we can ever hope to completely disentangle. But I do maintain that 
we have here a distinct set of effects which can be separately 
recognised and traced to a definite cause. That other influences must 
give rise to irregularities is inevitable. Yet I think an appeal to the 
rocks shows that there is still, in many cases at least, a distinctly 
recognisable residue of effects which may be traced to this one cause, 
by the observation and consideration of which much help may be 
derived in the elucidation of the tectonic history of complex districts. 
NOTICES OF MEMOTRS. 
——— 
I.—Inprx GerneRUM ET SPECIERUM ANIMALIUM.! 
[J\HE indexing of the literature for the second portion of this Index 
(1801-1850) has steadily progressed. Among the works included 
are :—Archiv fiir Bergbau, etc., 43 vols.; Archiv fiir die gesammte 
Naturlehre, 27 vols.; Archiv fiir Naturgeschichte, 16 vols.; Athenzeum, 
23 vols. ; Basel, Naturforschende Gesellschaft, 8 vols. ; Batavia, Batav. 
Genootsch., 16 vols.; Beitrage zur Petrefactenkunde (Muensters) ; 
Berlin, Gesellschaft naturforschende Freunde; Berlin, Bericht und 
1 Report of the Committee, consisting of Dr. Henry Woodward (Chairman), 
Dr, F. A. Bather (Secretary), Dr. P. L. Sclater, Rev. T. R. R. Stebbing, 
Dr. W. E. Hoyle, Hon. Walter Rothschild, and Lord Walsingham. By C. Davies 
Sherborn, F.G.S., F.Z.S. Read before Section D (Zoology), British Association,, 
Leicester, 1907. 
