OVUM IN THE CAPE AND NEW ZEALAND PERIPATUS. 25 
which is present in the ovary itself. This yolk is most plentiful 
just beneath the thin part of the ovarian wall, and is scarcer 
just below the germinal epithelium. It is possible that this is 
comparable to the condition found in Platyhelminthes, where 
a special part of the female organs is occupied in the formation 
of yolk, while in the form Macrostomum (2), as in P. nove- 
zealandiz, the function is actually performed in part of the 
ovarian tube itself instead of a special gland being set aside 
for it. I have no observations as to the origin of the small 
amount of yolk in the Cape species, but this is of little interest 
as it is obviously only a remnant of the large amount which is 
present in the New Zealand species. 
List or Papers REFERRED TO. 
(1) Bazprant, KE. G.— Sur l’origine des cellules du follicule et du noyau 
vitellin de l’ceuf chez les Géophiles,” ‘ Zool. Anzeig,’ 1883. 
(2) Batrour, F. M.—‘ Comparative Embryology,’ vol. i. 
(3) Bepparp, F.—* Observations on the Ovarian Ovum of Lepidosiren,” 
‘Proc. Zool. Soc.,’ May, 1886. 
(4) Benzepey, Ep. van.— Recherches sur la maturation de Veeuf et la 
Fécondation,” ‘ Arch. de Biol.,’ Tome iv, 1883. 
(5) Brocumann, F.—*“ Ueber die Entwicklung der N eritina fluviatilis,” 
Miull., ‘ Zeit. fiir wiss. Zool.,’ Band xxxvi. 
(6) Catpwett, W. H.—“The Embryology of Monotremata and Marsu- 
pialia,” Part I, ‘Phil. Trans.,’ 1887. 
(7) Carnoy, J. B.—‘La Cellule-Recueil de Cystologie et d’Histologie 
générale.’ 
(8) For, H.—‘ Recherches s. 1. Fécondation et 1. commen. d. l’Hénogénie,’ 
Geneve, 1879. 
(9) Garrroy, E.—“ Beitrage zur Anatomie u. Histologie von Peripatus,” 
* Schneider’s Zoologische Beitrage,’ Bd. i. 
(10) Henxine, H.—“ Untersuchungen tiber die Entwicklung der Phalan- 
giden,” ‘ Zeit. f. wiss. Zool.,’ xlv. 
