surface is flat, the external surface convex, the lateral circumference 

 rounded. 



" Tlie malė of the Egijptian Goose possesses also a bony enlarge- 

 ment at the šame part ; but as mucb difFerence exists between the 

 appendages in these tvvo Geese, as is kno\vn to prevail iii the form 

 of the enlargements of the trachecB in the various species of Ducks. 



" The protuberance in the EgypLian Goose is much broader thaa 

 it is high, its greatest measurement being in the hne of its trans- 

 verse diameter ; that of the Magellanic Goose is, on the contrary, 

 higher than it is broad, and its line of greatest measurement is from 

 before backvvards. 



•* As in all those Ducks possessing tracheal enlargements of bone 

 only,the stomach oi' the Magellanic Goose is a truemuscular gizzard, 

 with a small internal cavity having a dense and strong cuticular 

 lining ; the intestines are long and furnished \vith tvvo cfecal append- 

 ages, each 9 inches in length. This bird has also one pair of true 

 museles of voice. It and the Egyptian Goose are the only species 

 of Anser, as far as I am aware, in which any bony enlargements 

 have been noticed. They bear considerable general rescmblance 

 to each other in the colour of their plumage, and both exhibit a 

 brilliant speculum on the wirig, likę those observed in the Ducks." 



Specimens wcre exhibited of numerous Mollusca and Conchįfera, 

 hitherto undescribed, which form part of the coUection made by 

 Mr. H. Cuming, during a voyage undcrtaken by him in 1827, 1828, 

 1S29, and 1830, for the purpose of obtaining subjccts in Natūrai 

 Historj' on the western coast of South America, its adjacent islands, 

 and many of those which form the Archipelago of the South Pacific 

 Ocean. Nearly thrce hundred new species of these classes have 

 been already brought under the notice of the Committee of Science 

 and Correspondence, at various meetings during the past year, and 

 characters of them from the pens of Mr. Broderip and Mr.G. B. So\v- 

 erby, have been published in the Proceedings of that Committee. 

 The remaining species Mr. Cuming proposes to lay before the 

 Society from time to time, as the descriptions of them are com- 

 pleted. The intention of publishing coloured figures of them was 

 again announced. 



The nevv species exhibited at the present Meeting were accom- 

 panied by characters by Mr. Broderip. They are as follow -. — 



Genus Spondylus. 



Spondylus Princeps. Spond. iestd rotundatd, 6-coslatu, rubrd, 

 spinosa, spinis lingulatis, latls ; costis interstitiulibus 5. spinosis, 

 spinis brevioribus ; intus albd, limbo lato profunde plicato, riibro: 

 long. 5į-, nlt. 5, lat. 3 poli. {spinis haud incliisis). 

 Hab. ad Insulam Platam Columbise Occidentalis. 

 Found attached to coral rocks at the depth of seventeenfathoms, 

 In old specimens the interior is of a brownish hue, especlally at 

 the hinge.— W, J. B. 



Spondylus dubius. Spond. testd subrotundatd, crocedy 6-costatd, 



