141 
Ostrich, killed by accident in the Society’s menagerie. The follow- 
ing measurements of the corpuscles are expressed in vulgar fractions 
of an English inch :— 
Ostrich (Struthio Camelus, Linn.). 
Length of the discs. Breadth of the dises. 
1-1690 1-3000 Common size. 
1-1714 
-2000 Small size. 1-4000 Small size. 
1-1333 Large size. 1-2400 Large size. 
\ Common sizes. 
1-1649 Average. 1-3000 Average. 
Thickness of the discs. 
fe 1-9166 
Dimensions of the nuclei, exposed by dilute acetic acid. 
Length. Breadth. 
1-3200 1-9166 
Diameter of the pale globules of the blood. 
1-3329 
I have given several measurements of the blood-discs of the Emu 
and of the Rhea in the ‘ Appendix to Gerber’s Anatomy,’ p. 77, from 
which the following averages are taken :— 
Emu (Dromaius Nove-Hollandie, Vieill.). 
Length. Breadth. 
1-1690 1-3031 
American Ostrich (Rhea Americana, Briss.). 
Length. Breadth. 
1-1898 1-3273 
A comparison of these measurements will show that the blood- 
discs of the common Ostrich are slightly larger than those of the 
Emu and of the Rhea. 
Mr. Fraser laid before the Meeting some new species of Birds, 
constituting part of his collection formed at Fernando Po, and cha- 
racterized them as follows :— 
PLaTYSTEIRA CASTANEA. Platys. vertice genisque cinereis, mento 
albo ; dorso, alis supern?, guld et pectore castaneis ; abdomine albo, 
appendiculis carnosis circum oculos rubris ; rostro nigro iridibus 
rufescenti-fuscis ; tarsis ceruleo-purpurescentibus. 
Inter sexus haud coloris vera. 
Long. tot. 3,5, unc.; rostri, 755; ale, 2;2;; caude, 58 ; tarsi, 35. 
Hab. Clarence, Fernando Po. 
Found among the branches of the naked trees in June, sometimes 
in pairs; they are short and thick in form, the feathering being of 
downy nature. Its note is short. 
