476 REPORT OF THE HARVARD AFRICAN EXPEDITION 
markings seen on the terminal portions of the cirrus pouch could be inter- 
preted as hair-like spines. 
Female System. Protandry is a marked feature of the reproductive sys- 
tem. The female organs do not make their appearance until the production 
of the male elements is practically completed. The first structures in the 
female system to make their appearance are the accessory female organs (vitel- 
larium, ‘‘shell” gland, ete.) which are seen to arise as aggregations of chromo- 
philic cells at a point about one-third of the breadth of the segment from the poral 
margin. The receptaculum seminis already packed with sperm, then springs 
into existence and at about the same time a straight narrow tubule lined with 
elongate cells is observed in the central field of the segment extending from a 
point near the vitellarium to the neighborhood of the aporal excretory vessel. 
Very soon thereafter follicles consisting of more or less separate spherical cells 
with deeply-staining inclusions are found on either side (7. e., both anterior 
and posterior) of the aforementioned tubule. These follicles represent the 
ovary and the ova seem to descend directly and apparently at several places 
into the median tube which becomes dilated and functions as the uterus. The 
uterus has very thin walls and develops shallow outgrowths. This organ, in 
our material, contains very immature but apparently fertilized ova. The ova 
in all my specimens are in this immature condition, and consequently it is not 
possible to present a description of the mature egg and its enveloping mem- 
branes. A careful and extensive study has failed to reveal a well-defined oviduct. 
In no segment was the vagina seen as an intact tube, but in some sections the 
poral end of the receptaculum seminis is found drawn out into a wide tube 
extending laterally as far as the cirrus sac where its lumen becomes occluded. 
In a few very young segments two parallel lines of cells are found immediately 
posterior and somewhat ventral to the cirrus organ at the point of its entrance 
into the genital cloaca. These cells I interpret as destined to form the walls 
of the vagina, an organ which undoubtedly functions for a very brief period 
and atrophies soon after receiving sperm sufficient to fill the receptaculum 
seminis. The “‘shell’’-gland and the vitellarium are contiguous with the re- 
ceptaculum seminis, as shown in the diagram. The paucity of material and 
the transient nature of the female organs has not made it possible to determine 
the relationship between these structures so as to establish the mode of fertili- 
zation and construction of the egg. 
Host. Gorilla beringei. 
Location. Intestine. 
Locality. West of Lake Kivu, Belgian Congo. 
The study of this worm was instituted soon after the material was placed 
in my hands in October, 1927, but a decision as to the systematic disposition 
of the parasite was not arrived at until a short time before a reprint of a paper 
by Nybelin! (1927) was seen in April, 1928. Nybelin’s paper consists of a 
short general account of a cestode, from Gorilla beringet Matschie, collected in 
the Kivu voleano region by the Swedish Central Africa Expedition of 1921. 
' Nybelin, O. 1927. Anoplocephala gorillae. Arkiv for Zoologi. XIX B, No. 4, 3 pp. 
