484 
MR. W. H. CALDWELL ON THE EMBRYOLOGY 
68. Eimer, Th. Untersuchungen liber die Eier der Beptilien. I. Archiv Mikrosk. 
Anat., vol. 8, 1872, p. 216. 
69. Eimer, Th. Untersuchungen liber die Eier der Reptilien. II. Archiv Mikrosk. 
Anat., vol. 8, 1872, p. 397. 
70. Heape, Walter. The Development of the Mole. Quart. Journ. Microsc. Sci., 
vol. 26, 1886, p. 157. 
71. Jones, T. Wharton. On the First Changes in the Ova of Mammifera, &c. 
Phil. Trans., 1837, pp. 339-345. (Plate XLYI., fig. 1.) 
72. Meyer, H. Ueher das Saugethierei. Muller, Archiv, 1842. 
73. Peichert, C. B. Beitrage zur Entwickelungsgeschichte des Meerschweinchens, 
1862. 
74. Waldeyer, W. Eierstock und Ei. Leipzig, 1870. 
Explanation of the Plates. 
Reference Letters. 
alb = albumen. 
b = basilar membrane of follicular epithelium 
bl = posterior oj^ening of blastopore. 
cli =. pro-albumen. 
ep = epiblast. 
fe — follicular epithelium. 
gv = germinal vesicle. 
hy = hypoblast. 
o = oil (?) globule. 
n x = nucleus of smaller segmentation area. 
n 2 = „ larger 
sh = shell membrane. 
sh 1 = middle layer of shell membrane. 
sh. 2 = papillm of shell membrane. 
urn = coagulum. 
vm — vitelline membrane. 
Vi — y°lk granules. 
y 2 = white yolk. 
y 3 = yellow yolk. 
zr = zona radiata. 
