282 ON MOREAUIA MiRABILtS, 



intestinal limb, almost completely filling it. The testes are 

 large, transversely elongated, fairly deeply lobed bodies, each 

 exhibiting ten or twelve lobes. They are nearly equal in size, in 

 some cases the outer, in other cases the inner being slightly the 

 larger. 



In tlie eight specimens measured, the average lengtli of the 

 outer is 1'83, of the inner 1 -84 mm., or about one-fifth of the 

 whole breadth of the body. The ovary, which lies between the 

 two testes, is three- or four-lobed, and much smaller than the 

 testes, its longest diameter being 0'59 mm. 'ihe ovary occupies 

 practically the whole space between the two testes. The vas 

 deferens of the inner testis leaves it on its anterior aspect near 

 its outer border, quite near the ovary: that of the outer testis, 

 however, begins near its inner border, and the two vessels run 

 along, side by side, in a wavy course between the gonads and 

 the anterior limb of the right intestinal loop, passing dorsal to 

 the ventral sucker, and joining one another, at last, just as they 

 enter the cirrus-sac The cirrus-sac is very large and muscular. 

 It is 2-72 mm. in length, i.e., nearly one-third of the longest 

 diameter of the whole body. The vesicula seminalis is a con- 

 spicuous structure lying within the inner end of the cirrus-sac, 

 generally exhibiting two or three constrictions or twists. The 

 pars prostatica and the prostate-glands are also very conspicu- 

 ously developed (Fig. 4), lying, along with the seminal vesicle, in 

 a well developed mass of parenchyma, within the walls of the 

 cirrus-sac. The male organ of copulation is a cirrus rather than 

 a penis, consisting of an eversible tube. This structure forms one 

 of the most remarkable features of the worm under consideration. 

 The inner wall of the eversible part of the tube, in its involuted 

 or withdrawn state, is densely covered with large, thick, some- 

 what pointed and recurved chitinoid spines (Figs. 16 and 3). In 

 the everted position of the organ, these spines are, of course, on 

 its outer surface. 



The oviduct leaves the ovary near its anterior-inner corner. 

 The outer end of the inner testis is smaller than the rest of it, 

 and in the space thus left, between it and the anterior loop of 

 the intestine, the ootype, the small yolk-reservoir, and the com- 



