316 DR. G. J. ROMANES ON THE MENTAL [JunC 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 

 cyclocoelous. 



All the birds within the inner concentric circle are orthoccelous. 



Underlined names refer to telogyrous formation. 



Eelationship is indicated by the excentric circles and by dotted connecting 

 lines. 



June 4, 1889. 



Osbert Salvia, 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 1/2 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 1st, by the Rey. 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 

 Hke a Mole, and is an interesting animal, though hardly suitable for 

 public exhibition. 



Mr. 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 George J. Romanes, 

 F.R.S., F.Z.S. 



[Eeceived 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. Z. S. 1885, p. 673, pi. xli. 



