[9] NOTES ON ENTOZOA OF MARINE FISHES. 727 



in all cases, but was plainly seen as an irregularly convoluted tube 

 lying- within the pouch. The vagina follows the posterior edge of the 

 latter as far as its base. I have not yet been able to determine its 

 course beyond that point with any degree of certainty. 



The interior of the unripe segments, when seen either in cross or Ion- 

 gitudinal sections, appears for the greater part to be an open net-work 

 of connective fibers, in the spaces of which are granular bodies, of which 

 three different sets were made out. What I take to be the ovary is a 

 lobed body, lying near the posterior edge of the segments, and symmet- 

 rically 011 each side of the median line. It lies nearest that lateral face 

 which does not bear the sexual apertures. It is broader in its trans- 

 verse than in its longitudinal diameter. In its widest part it equals 

 about one fourth the breadth of the segment, and in its thickest part it 

 about equals one-fourth the thickness of the segment. Immediately 

 above it a small oval body was observed in some of the transverse sec- 

 tions, which I take to be the shell-gland. In front of the ovary and 

 occupying the middle of the interior of the segment there is a mass of 

 granular globular bodies which are differentiated into two kinds by car- 

 mine. The more central ones remain yellowish in color while the others 

 are deeply stained. The latter I take to be the testes, the former is prob- 

 ably the vas deferens. 



The walls of the cirrus-bulb and of the vaginal tube are clearly defined 

 and composed for the most part of circular fibers. 



Near the anterior edge of each segment, and on the side opposite that 

 which bears the reproductive apertures, is situated a circular aperture 

 about .04 inm in diameter. It enlarges into an inner cavity which appar- 

 ently communicates with some large irregular spaces that probably rep- 

 resent sections of the uterus. The wall of this aperture, as well as those 

 of the inner cavity, with which it communicates, are rather thick and 

 granular. On the mature segments these apertures persist and become 

 larger, while those of the reproductive organs become rather indistinct. 

 In the mature segments they were also seen to communicate with en- 

 larged open spaces which, in the younger segments, contain granular 

 masses. The mature segments are, to a great extent, filled with the 

 ample folds of the uterus, which are crowded with ova. The uterus, and 

 the ovary together in these segments, have the appearance of the let- 

 ter S. 



In the posterior part of the segment those folds of the uterus which 

 are adjacent to the ovary are crowded together so as to form an irregu- 

 larly lobed mass. In the middle of the segment the lobes are parallel 

 with each other in a direction transverse to the axis of the segment, 

 and, for the most part, one side of the median line. In front of this the 

 uterus broadens and loses its lobed appearance, while the contained 

 ova are not so densely crowded. This part of the uterus corresponds 

 to the open cellular spaces observed in the sections. It is to be noticed 

 that this part of the uterus, which lies in the anterior part of the seg- 



