150 



the two optic uerves appeared to unite without decussation ; the eye 

 was large, and tOTO pupils existed ; the nostrils were absent." 



Dr. Crisp remarked, that although the Cyclops variety of mon- 

 strosity was not very rare, but few cases were on record of the dis- 

 section of the brain. 



June 10, 1856. 



Dr. Gray, F.R.S., in the Chair. 



1. On two New Spkciks of Humming Birds belonging to 

 THE GENUS Amazilius. By John Gould, F.R.S., V.P.Z.S., 



ETC. 



Amazilius cerviniventris, Gould. 



Head, all the upper surface and wing- and upper tail-coverts 

 bronzy-gieen ; wings 2)urplish-brown ; tail dark chestnut-red, each 

 feather narrowly bordered and tipped with a bronzy lustre, which is 

 of greatest extent and most conspicuous on the two centre tail- 

 feathers ; throat and chest luminous green ; under surface of the 

 shoulder and flanks duU green ; abdomen and under tail-coverts fawn- 

 colour ; thighs white ; upper mandible yellow at the base, merging 

 into brown and tipped with black ; under mandible pale yellow, ex- 

 cept at the tip, whieh is black. 



Totai leugth, 4 inches ; bill, \į; wing, 2i ; tail, If. 



Hab. Cordova, in Mexico. Collected by M. Salle. 



Remark. — This species is about the size of A. Riefferi ; but its 

 bill is less robust ; the wings, as in that species, are uniform pur- 

 plish-brown ; the chestnut colouring of the tail-feathers and the 

 under tail-coverts is of a somewhat lighter hue. 



Amazilius castaneiventris, Gould. 



Crown of the head, upper part of the back and shoulders reddish- 

 bronze ; rump and upper tail-coverts greyish, with a bronzy Austre ; 

 wings purplish-brown, with the exception of the basai portion of the 

 primaries and secondaries, which are rufous ; tail dark chestnut, 

 tipped with a bronzy lustre, of greatest extent and most conspicuous 

 on the centre feathers ; throat, fore part of the neck, breast, and 

 upper part of the abdomen shiniug golden-green ; under surface of 

 the shoulders, lower part of the abdomen and under tail-coverts fine 

 chestnut-red ; thighs white ; upper mandible brownish-black ; under 

 mandible fleshy-yellow, except at the tip, which is brownish-black. 



Totai length, 3į inches ; bill, |; wing, 2^^ ; tail, 1|. 



Hab. Santa Fe de Bogota. From the Collection of Mr. Mark. 



Remark. — This species differs from A. cerviniventris in the much 

 greater depth of the chestnut colouring of the abdomen, under tail- 



