io THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
Alimentary Canal : — 
The oral cavity, at first circular in outline, then becomes elongated 
transversely, as it eventually expands into the two lateral pouches (fig. 3). 
The whole of the wall of the buccal cavity, including the pouches, is formed 
of thick bundles of muscle. The oesophagus, which is the portion below the 
level of the pouches, leads into a well-developed sphincter muscle at the point 
at which the gut forks. This point is a somewhat variable one, the bifurcation 
taking place, as noticed by Lewis and McConnell, sometimes above and 
sometimes below the level of the common genital pore. From this point the 
gut forks diverge to run a practically straight course, terminating about the 
centre of the opening of the posterior sucker. 
Nerve Ganglia : — 
At the level of the pharyngeal pouches two prominent ganglia are seen in 
transverse section. From these, according to Lewis and McConnell, nerve 
filaments run on the ventral surface of the two gut forks. 
Excretory System : — 
The excretory vessels are very well developed, and, as in G. polymastos, 
extend to the apex of the anterior conical portion. They appear to be 
especially numerous and large on the ventral surface of the disc. 
Genital Organs : — 
In Lewis and McConnel's figure of the genital organs of this fluke two 
lobed bodies are depicted, the anterior of which was considered to be the 
testis, and the posterior one the ovary. Now the allied species G. poly- 
mastos has two testes, and the posterior one approximately in the position of 
this so-called ovary of G. kominis. This fact and the fact that a single testis 
had only been described in one other " Amphistome," viz., A. sabclavatum, led 
Leuckart and Cobbold to doubt whether this was an ovary, and to think that 
the ovary had been overlooked in the dissection. This is exactly what has 
occurred. This posterior body of Lewis and McConnell is a testis, and not 
an ovary. 
Testes : — 
They are two in number (fig. 2). The anterior, which is smaller than 
the posterior, lies at about the level where the anterior conical portion joins 
the disc. It is a lobed body, and is separated from the posterior testis by 
some of the uterine coils. The posterior testis, also lobed, lies just in front 
of the anterior margin of the posterior sucker, and is separated from it by 
the ovary. 
The vasa deferentia leave the testes on their dorsal aspect, but their 
exact course could not be followed. While in G. polymastos the one testis 
has a postero-lateral position with regard to the other, both occupying the 
area enclosed by the disc ; in G. hominis the testes he directly behind one 
another, and the anterior partly encroaches on the conical portion of the 
fluke. Probably connected with this is the more anterior position of the 
genital pore in G. hominis. 
While the ducts could not be traced with certainty, a very striking 
appearance in many sections was the dilated seminal vesicle crowded with 
spermatozoa. This portion of the duct lay coiled for the most part trans- 
versely between the genital pore and the anterior testis. 
