NOTES AND DESCRIPTIONS OF SOME PARASITIC HELMINTHS 4/5 
closely related to the parasite under discussion, and for an interesting explana- 
tion that has been suggested for this physiological condition, the reader is 
referred to the paper of Stunkard ! (1926), pages 2-3. 

Text Figure 2.— Anoplocephala gorillae Nybelin, 1927; semi-diagrammatic composite figure 
Male Organs. The testes attain their functional condition very early in 
the development of the strobila. They are first seen in section in the very 
narrow segments — about the fourteenth segment from the scolex. The mature 
sperm are rapidly passed into the vas deferens where they accumulate in two 
or more local dilations of the tube. Such dilations, representing vesiculae 
seminalis crowded with sperm, are first found in the sixteenth segment. They 
persist throughout the remainder of the strobila, frequently becoming fused 
to form a single massive vesical nearly 0.65 mm. in length, and filling the seg- 
ment to the extent of more than half its width. The testicular follicles are 
about 40u in diameter and are too numerous (probably more than one hundred 
fifty) to be counted accurately. They show a tendency to coalesce into larger 
secondary agglomerations as the segments grow older and the male glands pass 
beyond their functional stage. The testes are distributed in a practically uninter- 
rupted field between the lateral excretory vessels, and, as transverse sections 
show, they occur in sheets two or three deep in the dorsal medullary paren- 
chyma. The sperm pass from the dilated vas deferens, or external vesicula 
seminalis, into an internal vesicula seminalis which occupies the mesial portion 
of the spacious piriform cirrus pouch and which may undergo a certain amount 
of tortion. The walls of the cirrus pouch are thick and muscular, and power- 
ful retractor muscle fibers are attached to it from the transverse muscle sheets 
of the body. In sections, a few unicellular glands are seen surrounding the 
entrance of the vas deferens into the cirrus. These cells probably represent a 
weakly-developed prostate gland. The cirrus organ is a very muscular tube 
with a narrow lumen lined with a thick cuticula. It opens on the dorsal edge 
of the segment near its center into a sight bursa, which, at its external openings, 
is surrounded by puckerings of the cuticle arranged in rosette fashion. The 
genital orifice of each segment is regularly unilateral throughout the length 
of the strobila. The cirrus organ was not seen protruded in any segment, and, 
so far as I have been able to determine from a close scrutiny of the organ 
in suitable toto-mounts as well as in numerous sections, it is not furnished 
with a spinous external covering. It may be, however, that the finely-patterned 
1 Stunkard H. W.: The tapeworms of the Rhinoceroses, a study based on material from the Belgian 
Congo. Amer. Mus. Novitates No. 210 (March 10, 1926), pp. 1-17. 
