1892.] MR. SCLATER ON THE EGG OF ^PYORNIS MEDIUS. 299 



ultimus non descendens, prope suturam coiicavo-depressus, ad 

 peripheriam carinatus, aliter rotunde convexus; apertura sub- 

 circularis ; peristoma continuum, simplex, leviter incrassatum. 

 Diam. maj. 36, min. 30, alt. 20 millim. 

 Hab. Bogota [Mus. Da Costa). 



The thread-like ridges on the body-whorl of this shell are much 

 more distant and prominent than in C. blanchetianus (Moricand) 

 and in other allied species. I have at present only seen a single 

 specimen. 



EXPLANATION OF PLATE XXin. 



Figs. 1-4. Claiisilia magistra, p. 298. 



5, 6. Hyalinia gome:i, p. 298. 



7,8. Bulimus gucnlheri, p. 29(5. 



9-12. Bidimulus koppeli, p. 297. 



13, 14. — — glandiniformu, p. 297. 



15, 16. da-cosi<e, p. 297. 



17-19. Cyclotus filo-liratus, p. 298. 



May .3, 1892. 

 Prof. Flower, C.B., LL.D., F.R.S., President, in the Chair. 



'J'he Secretary read the following report on the additions to the 

 Society's Menagerie during the month of April 1892 : — 



The total nnmber of registered additions to the Society's Mena- 

 gerie during the month of April was 83, of whicii 31 were by 

 presentation, 2 by exchange, 27 by purchase, 10 by birth, and 13 

 were received on deposit. The total number of departures during 

 the same period, by death and removals, was 84. 



Amongst the additions special attention may be called to : — 



A Finely-marked Owl (^Fseudoscops grammicus), from Jamaica, 

 presented by the Jamaica Institute, April 8th, being the first 

 living example of this Owl that has reached us. 



Mr. Sclater exhibited and made remarks upon a nearly perfect 

 eg^ of one of the extinct gigantic birds of Madagascar of the genus 

 ^pyornis (probably^, medius), obtained from tlie sands near Cape 

 S. Marie in the Suuth of Madagascar, by a correspondent, resident 

 at Fort Dauphin, of Mr. W. Clayton "Pickertgill, H.B.M. Vice- 

 Consul at Antananarivo, and lately brought to England by that 

 gentleman. 



The egg measured llg by 8| inches. Its larger circumference 

 was 31 1 inches, and its smaller 2ti^ inches. It was therefore not 

 quite so large as the specimen figured by Rowley (Orn. Misc. iii. 

 ])1 cxii.), and came nearer in dimensions to the specimen in the 

 British Museum (41,484) referred by Mr. Lydekker (Cat. Fossil 

 Birds, p. 214) to j^. medius. 



The following papers were read : — 



