1889.] Embryology. 827 
logy in 1886, also those relating to ornithology for the same year 
(Ant. Reichenow). Dr. O. Boettger gives the herpetological works of 
1886; Dr. F. Hilgendorf the ichthyological, and Drs. G. Pfefferand 
W. Kobett the malacological. 
Captain Fielden of the English army has discovered that the African 
monkey Cercopithcius callitrichus has become wild in the island of 
Barbadoes, W. I. 
EMBRYOLOGY. 
Extra-Ovarian Primordial Ova in the Human Embryo.— 
Dr. W. NageH reports the discovery of primordial ova in the strip of 
epithelium which is present on the outer side of the Wolffian body of 
human embryos. This discovery renders it pretty certain that the re- 
productive tissues were at one time much more extensively developed 
than in the present human species, probably in some premammalian 
type from which man and other mammalia, birds, reptiles and batra- 
chia have descended. It is certain, at any rate, that the only living 
forms in which the reproductive or germinal tissue is developed 
throughout almost or quite the whole of the extent of the dorsal por- 
tion of the body cavity are some of the fishes. This discovery com- 
pares in importance and significance with that of Rathke made about 
forty years since, when that brilliant investigator announced the pres- 
ence of branchial clefts during the early embryonic condition of all 
the higher vertebrates. Embryologists will await the publication of 
Dr. Nagel's completed studies upon extra-ovarian primordial ova with 
great interest. 
Karyokinesis in Larval Amblystoma.— Last spring, through 
the kind offices of Miss Fanny R. M. Hitchcock, of New York City, 
Leber das Vorkommen von Primordialei 
Menschen. Anat. Anzeiger, IV., 1889, xNo. 16, pp. 496-498, 2 figs. 
