Fig 1. 
Or 
65 
DESCRIPTION OF THE PLATES. 
PLATE I. 
Head of a female Apterya*, 
a. The external nostril. 
. Head of a male Apteryz. 
a. The cere. 
b. The ear. 
. Head of a Rhea Americana. 
a. The cere. 
b. The ear. 
The external appearance of the rudimental wing of the Apterye when the 
feathers are removed: it exhibits the form of one of the abnormal small 
quill-feathers described at p. 3. 
. One of the neck-feathers of the Apteryz. 
PLATE II. | 
Abdominal sacs of the Apteryz. 
a. The right hepatic sac, with a style passing through the aperture of com- 
munication with 
. The right enteric sac. 
. Another style, passing by the side of the stomach, into the left hepatic sac. 
. Omentum. 
The pancreas. 
The duodenum. 
The fold of jejunum. 
. The rectum. 
. The external sphincter. 
The penis. 
The two portions of the pectoralis major. 
. Pectoralis medius. 
. Pectoralis minor, seu internus. 
oS aS 
Se, pie Se 
* Since the preceding pages were printed Mr. Cunningham has transmitted to the Zoological Society the 
skin and the trunk of an Apteryz, which proves to be a female, and has a beak measuring from the gape to the 
tip six inches four lines, thus verifying the conjecture put forth at p. 4, that the difference in the length of the 
beak is sexual, and that the longer one characterizes the female. 
K 
