316 DR. G. J. ROMANES ON THE MENTAL [June 4, 
EXPLANATION OF PLATE XXXII. 
Diagrammatic representation of affinities of Birds according to their intestinal 
convolutions. 
All the names between the two concentric rings refer to Birds which are 
cycloccelous. 
All the birds within the inner concentric circle are orthoccelous. 
Underlined names refer to telogyrous formation. 
Relationship is indicated by the excentric circles and by dotted connecting 
lines. 
June 4, 1889. 
Osbert Salvin, Esq., F.R.S., Vice-President, in the Chair. 
The Secretary read the following report on the additions to the 
Society’s Menagerie during the month of May 1889 :— 
The total number of registered additions to the Society’s Mena- 
gerie during the month of May were 172 in number. Of these 121 
were acquired by presentation, 6 by exchange, 9 by deposit, 21 by 
purchase, and 15 by birth. The total number of departures during 
the same period, by death and removals, was 124. 
Amongst these I may call attention to an albino variety of the 
Cape Mole-Rat (Georychus capensis), presented to the Menagerie, 
May Ist, by the Rev. G. H. R. Fisk, C.M.Z.S. The ordinary colour 
of this Rodent is a uniform grey; the present specimen, however, is 
nearly pure white with black eyes. It lives entirely under the earth 
like a Mole, and is an interesting animal, though hardly suitable for 
public exhibition. 
My. H. E. Dresser exhibited and made remarks on some eggs of 
the Adriatic Black-headed Gull (Larus melanocephalus) and of the 
Slender-billed Gull (Larus gelastes), which had lately been obtained 
at their nesting-places in the marshes of Andalusia by Col. Hanbury 
Barclay, F.Z.S., and himself. 
The following papers were read :— 
1. On the Mental Faculties of the Bald Chimpanzee 
(Anthropopithecus calvus). By Grorcr J. Romanes, 
F.R.S., F.Z.S. 
[Received June 4, 1889.] 
The female Chimpanzee, which has now been in the Society’s 
menagerie for nearly six years ', has attracted general notice, not only 
on account of her peculiar zoological characters, but perhaps still 
more on account of her high intelligence. This is conspicuously 
displayed by the remarkable degree in which she is able to under- 
stand the meaning of spoken language—a degree which is fully equal 
to that presented by an infant a few months before emerging from 
1 Cf. Bartlett, P. ZS. 1885, p. 673, pl. xli. 
