Notices of Memoirs—Sherborn’s Index Animalium. 519 
a tower ona foundation of sand. To scrutinize, rather than to advocate 
any hypothesis, has been my aim throughout this address, and, if my 
efforts have been to some extent successful, I trust to be forgiven, 
though I may have trespassed on your patience and disappointed 
a legitimate expectation. 
IJ.—Inpex Grevervm Et Speciervm Animatium. Report of a Committee 
consisting of Dr. Henry Woopwarp (Chairman), Dr. F. A. Barner 
(Secretary), Dr. P. L. Sctatzr, Rev. T. R. R. Sressrne, Dr. W. E. 
Horie, Hon. Watrer Roruscuitp, and Lord Watsinenam.! 
ONTINUOUS and steady progress has been made by Mr. Davies 
Sherborn in the preparation of Volume II of this Index. Since 
the report for last year was sent in, Mr. Sherborn has dealt with the 
remainder of the separate works of authors whose names begin with C, 
and of these the various editions of Cuvier proved exceptionally long 
and tedious to analyse. Other works have also been dealt with as 
opportunity offered. 
Valuable assistance has been rendered by Mr. Hartley Durrant, who 
lent from Lord Walsingham’s library (presented to the Trustees of the 
British Museum) a fine copy of the extremely rare work by Billberg, 
Enumeratio Insectorum, 1820, which has been indexed and made 
available for reference. 
The slips, which are preserved in the British Museum (Natural 
History) by the kindness of the Trustees, are quite in order for those 
who wish to consult them, and are of exceptional value to anyone 
monographing a particular genus. 
Mr. Sherborn and Mr. H. O. N. Shaw have written a paper clearing 
up the difficulties surrounding Sowerby’s Conchological Illustrations 
and Gray’s Descriptive Catalogue of Shells,? and Mr. Sherborn 
himself has written on the dates of the parts of Burmeister’s Genera 
Insectorum, 1838—46.5 
Systematic and regular work on this Index is greatly encouraged 
by the friendly attitude of the Association, and the Committee, in 
recommending its own reappointment, earnestly ask the Association to 
continue this valuable help by a further grant of £100. 
III.—Ovrtines oF tHe Grotocy or Nortuern Nicerta. By Dr. J. D. 
Fatconer, M.A., F.G.S.* 
HE Protectorate of Northern Nigeria lies for the most part between 
Lake Chad and the confluence of the Rivers Niger and Benue, 
and comprises an area of about 255,700 square miles. Crystalline 
rocks are exposed over about half of this area, and among them two 
series have been recognized: (1) a series of hard, banded, and much 
granitized gneisses of an Archean type; (2) a series of quartzites, 
1 Read before the British Association Meeting, Sheffield, 1910 (Section D). 
2 Proc. Malac. Soc., September, 1909, pp. 331-40. 
3 Ann. Mag. Nat. Hist., January, 1910. 
* Read before the British Association Meeting, Sheffield, 1910 (Section C). 
