Thal. venusta. 



Inhabits Costa Rica and the southern portion of Mexico. The 

 only species of the genus yet discovered to the north of Panama. 



Thal. viridipectus. 



A beautiful species lately sent to Europe from the Caraccas near 

 to the Andes. 



Thal. verticeps. 



A species found only in my own collection. It frequents the 

 wooded regions on the west side of Pichincha in Ecuador. Sent to 

 me by Mr. Jameson. 



Thal. glaucopis. 



Hab. South Brazil. 



Thal. Watertoni. 



This is the largest species of the genus and a very beautiful bird. 



Hab. Demerara. 



Thal. Wagleri. 



Hab. The hilly regions of Brazil, particularly Minas Geraes. 

 Thal, eriphile. 



This species also inhabits Brazil, and is generally sent in collec- 

 tions from Rio. 



Thal. refulgens, n. sp. 



A species very like furcatus in colour, but nearly as large as 

 Watertoni. The under tail-coverts are steel-black ; crown of the 

 head velvety black ; breast and shoulders beautiful purplish blue ; 

 tail black and considerably forked ; wings purplish brown ; throat 

 rich metallic green. 



Hab. ? 



January 27, 1852. 

 Professor Bell, F.R.S., in the Chair. 

 The following papers were read : — 

 1. Notes on the Eggs and Young of the Apteryx, and on 



THE casts of the EgGS AND CERTAIN BoNES OF jEPYORNlS 

 (ISID. GeOFFROy), RECENTLY TRANSMITTED TO THE ZOOLO- 

 GICAL Society of London. By Professor Owen, F.R.S., 

 F.G.S., F.Z.S. 



(Aves, PI. XLVI.) 



The Secretary placed upon the table casts of two eggs and of por- 

 tions of the leg-bones of a gigantic bird of the Island of Madagascar, 

 which had been presented by the Administration of the Garden of 

 Plants in Paris to the Zoological Society of London, and on these 

 Professor Owen made the following observations. 



