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



ultimus non descendens, prope suturam concavo-depressus, ad 

 peripheriam carinatus, aliier rotunde convex us ; 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 OP PLATE XXIII. 



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



5, 6. Hyalinia gomezi, p. 298. 



7, 8. Bulirnus guentheri, p. 296. 



9-12. BiUimulus koppeli, p. 297. 



13, 14. glandiniformis, p. 297. 



15, 16. da-costcB, p. 297. 



17-19. Ci/clotus filo-liratus, p. 298. 



May 3, 1892. 

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



The Secretary read tbe following report on the additions to the 

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



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

 gerie during the month of April was 83, of which 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 {Pseiidoscopjs 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 

 eg2; of one of the extinct gigantic birds of Madagascar of the genus 

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

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

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

 Consul at Antananarivo, and lately brought to England by that 

 gentleman. 



The egg measured 11| by 8^ inches. Its larger circumference 

 was 31 1 inches, and its smaller 2t)|- inches. It was therefore not 

 quite so large as the specimen figured by Ro«lev (Orn. Misc. iii. 

 pi 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 ^. medius. 



The following papers were read : — 



