272 
Cladorchis subtriquetrus Rud. 
In the second yet more immature specimen (the one sectioned longi¬ 
tudinally and which had been compressed) the testes appear differently. 
They are elongated dorso-ventrally and well separated from each other, 
the dorsal halves of each are quite smooth, branches projecting radially 
from the ventral portions only. The branches are short and compara¬ 
tively straight, and the anterior testis lies distinctly ventral to the 
posterior one. 
The right vas efferens originates in the anterior testis (which is 
therefore the right testis), emerging from the right side of the base of 
a heavy dorsal branch. It curves posteriorly for a very short distance 
(0-112 mm.), and, at the level of the genital pore arches anteriorly and 
laterally, gaining the mesial wall of the right caecum; hugging this 
closely, it passes anteriorly arid slightly dorsally but always intercae- 
cally. The left vas efferens emerges from the body of the inferior 
testis, posteriorly and slightly to the left of the mid-line and approxi¬ 
mately mid-way between its anterior and posterior borders. It passes 
anteriorly and slightly dorsally being surrounded at first by testicular 
branches, but soon it attains and follows the caecum like its fellow. 
The two caeca converge rather quickly post-bifurcally and unite well 
dorsally immediately anterior to the most anterior testicular branch. 
The vas deferens is short, and not provided with musculature ; it quickly 
bends ventrally and posteriorly (accompanied at this point by the 
uterus) forming a moderately (at one point only notably) dilated and 
closely coiled vesicula seminalis externa. The latter pierces a pyriform 
cirrus pouch lying slightly to the left of the median line, anterior to 
the genital pore, and immediately anterior to the posterior border of 
the oral sucker. Its long axis extends obliquely from a left, anterior 
and dorsal point toward the right, posteriorly and ventrally, its broader 
extremity directed dorsally; it measures 0-3 mm. in length, 0-18 mm. 
wide, and its walls are moderately thick, 0-02 mm. They taper finely 
at the end which encloses the cirrus. The vesicula seminalis interna 
makes one or two close turns, becomes very narrow and continuous with 
the short poorly developed cirrus 1 . The interval between the coils and 
the cirrus wall is occupied by a fine reticulum holding numerous 
(prostatic?) cells. The tip of the penis occupies a chamber which 
passes into a very fine ejaculatory duct, that unites in the genital 
papilla with the metraterm. Spermatozoa were not found anywhere 
in the tubular portions of this system. 
Variations from the foregoing were noted as follows in the more 
1 Otto does not note the cirrus. 
