'1'42 Professor Airy in reply to Mr. Ivory, 



99. Cynaiithus Lucifer. 



"js, , iV;.-* Golden green; throat amethystine; the feathers elongated 

 -^^'>' ■' and narrow ; tail short, the feathers pointed; bill curved. 

 ' Table land. Temiscaltipec. 



This is an aberrant species ; allied, by its curved bill, to 

 Cy, bifitrcatus. 



G. Lampornis. Swains, in Zool. Jourti. No. 10. 



100. Lampornis amethrjstinus. S\v. 



Green ; chin and upper part of the throat amethystine ; ears 



black, margined above with white; tail black. Female? 

 Table land, Temiscaltipec. Real del Monte. 

 Total length, 5 : bill, 1 ; wings, 2-rV ; tail, 1^, 



101. Momotus Mexicanus. 



Head and neck cinnamoneous ; back and wings green ; ear 

 feathers lengthened, black tipt with blue ; beneath the eye 

 a caerulean spot ; under plumage greenish white, 



Temiscaltipec. 



Much smaller than the Brazilian species : on the throat are 

 two small tufts of black feathers, longer than the others ; a 

 character which is not, however, peculiar to this species. 



LXXXVI, Om some Passages in Mr. Ivory's Remarks on a 

 Memoir hy M. Poisson relating to the Attraction of Spheroids. 

 By G. B. Airy, Esq. A.M.., Lucasian Professor of Mathe- 

 matics in the University of Cambridge. 



To the Editors of the Philosophical Magazine atid Ajinals. 

 Gentlemen, 

 TN a paper printed in the last Number of the Philosophical 

 -*■ Magazine and Annals, Mr. Ivory has coupled my name with 

 terms which have never before appeared in the pages of your 

 Magazine, or (I will venture to say) in those of any other 

 scientific Journal. After such an attack, I am entitletl to ask 

 that you will insert in your next Number my answer to the 

 accusation which Mr. Ivory has brought against me in so un- 

 disguised a manner. 



When I read this article, I was grieved to think that I 

 had been the cause (I diink I need not say the unintentional 

 cause) of irritating Mr. Ivory's feelings to such a degree, as 

 to occasion the use of die opprobrious epithets alluded to. 

 Though conscious tliat I had used no language, except that 

 of courtesy towards Mr. Ivory, I referred immediately to the 

 note to my paper in the Philosophical Transactions, of which 

 he complains so bitterly. In it I found nothing which could 

 justify the torrent of spleen that Mr. Ivory has vented against 

 me. And I profess tiiat I have said nothing in that note 



which 



