6 Aves. 
AYES. 
[Forbes, W. A.] Note on some points in the Anatomy of an Australian 
Duck ( Bizlura lobata ). Tom. cit. pp. 455-458. 
Describes particularly the trachea, and a peculiar gular pouch in the 
male. [Anutidoi.'] 
. Contributions to the Anatomy of Passerino Birds. Part v. On the 
structure of the genus Orthonyx. Tom. cit. pp. 544-546. [ Time- 
liidcc.'] 
. On the rudimentary hallux in Birds. Tom. cit. pp. 548 & 549. 
Shows that many species of Birds hitherto supposed to be “ three-toed,” 
really have a hallux, though it is generally concealed underneath the 
skin. 
. Contributions to tho Anatomy of Passerine Birds. Part vi. On 
Xenicus and A canthisitta as types of a new Family ( Xenicidcc ) of 
Mesomyodian Passeres from New Zealand. Tom. cit. pp. 569-571. 
[See Xenicidce.~\ 
. On a new species of Hemipode from New Britain. Ibis, 1882, 
pp. 428-431, pi. xii. [ Turnicidce.'] 
. Tho claw on tho “Index” finger of the Cathartidcc. Am. Nat. 
xvi. pp. 141 & 142. 
Notes on tho presence of this claw in the American Vultures and other 
groups of Birds. 
Forster, J. It. Animals of Hudson’s Bay. [Edited by P. L. Sclater.] 
8vo, pp. [Willughby Society (reprint) 1882.] 
. Catalogue of the Animals of North America, or Faunula Ameri- 
cana, 1771. [Edited by P. L. Sclater.] 8vo, pp. 43. [Willughby 
Society (reprint) 1882.] 
Gadow, Hans. On some points in the Anatomy of Plerocles, with 
remarks on its Systematic Position. P. Z. S. 1882, pp. 312-332. 
\_Pteroclidce.~\ 
- •. On the colour of feathers as affected by their structure. Tom. cit. 
pp. 409-421, pis. xxvii. & xxviii. 
Certain colours, e.g ., blue, violet, and green, are due to a particular 
structure of the feathers, and not produced by colour pigment. The 
metallic colours are likewise structural. Birds showing such metallic 
varying colours should be described and examined under tho following 
three standard positions: — Position a. The eye being between tho light 
and the object, the latter being kept parallel to the line of vision or to 
the light. Position B. Eye between light and object, the latter being 
kept vertically to the light. Position C. Object between eye and light 
the object being kept again parallel to the light. 
. See also Haswell, W. A. 
Gentry, T. C. Illustrations of Nests and Eggs of Birds of the United 
States. Philadelphia : 1880-82, 4to, pts. 1-25, pp. 1-300, pis. i.-liv. 
[Not seen by the Recorder.] [Cf. Bull. Nutt. Orn. Club, vii. 
pp. 246-249.] 
