327] PSEUDOPHYLLIDEA FROM FISHES— COOPER 39 



within outwards of the cuticula for the original epithelium may be followed 

 very easily in the walls of the vagina. The duct gradually enlarges to form 

 a much elongated receptaculum seminis (Fig. 79) with a diameter of 92 to 104/i 

 (9 to 21)u, according to Kiessling!) and sharply separated from the spermiduct, 

 which, however, was not found to unite with the oviduct close to thei dorsal 

 transverse musculature as stated by Fuhrmann, but close to the ventral wall 

 of the medulla. The ovary consists of two large wings (Fig. 79), composed of 

 closely crowded tubules, lying immediately upon the ventral transverse muscles 

 and united by a much smaller isthmus, the whole having a width of 0.64mm. as 

 compared with the 0.28mm. of Solowiow. The average length and depth of 

 the wings are, respectively, 105 and 90/x. Ova from the isthmus and more 

 median portions of the wings of the ovary have a diameter of 13ju while their 

 nuclei are 5/x. The respective measurements by Kiessling and Solowiow are 

 9 and 6/x and 13.9 to 23.3)Lt and 1 .5 to 2/x. Fuhrmarm stated that one of the most 

 important differences between his Sch. zschokkei and Sch. solidus was the pre- 

 sence in the former of an oocapt, but Liihe (1899a:717) claimed that this 

 structure was in all probability overlooked by Kiesshng. It arises from the 

 posterior aspect of the isthmus almost in the median hne with a diameter of 

 from 35 to 40ju. The oviduct, according to Kiessling has a diameter of 13, or 

 to Solowiow of 27/u; here it was foimd to be from 25 to 30jli between the entrance 

 of the vagina and that of the common viteUine duct, which two points are close 

 together as in L. intestinalis. The common viteUine duct enlarges some little 

 distance from its opening into the oviduct to form a vitelUne reservoir having 

 a diameter of 30^ (23;u, Kiessling). The vitelUne folUcles are extremely num- 

 erous and closely crowded together in a layer with a maximum thickness of 

 85/Lt, situated between the inner longitudinal and middle transverse muscles 

 (Fig. 79). They are continuous at the margins of the proglottis as they are 

 from joint to joint, and are broken only in Umited elliptical areas above and 

 below the reproductive ducts in the median line, as stated by Fuhrmarm. 

 The dimensions of the individual follicles are from 58 to 87 by 18 to 26/i, 

 the larger dimensions being the dorsoventral diameters, — 56 to 107 by 56/i, ac- 

 cording to KiessUng, and 18 by 27/i after Solowiow. Just beyond the entrance 

 of the common viteUine duct the oviduct enlarges to form the ootype with 

 a diameter of 16/x (20/x, Kiessling) which is surrounded by the shell-gland, 

 situated just above the median frontal plane and somewhat lateral. Thru- 

 out its course the oviduct is lined with an epithelium in which prominent 

 nuclei but no distinct cell boundaries appear and from which numerous cilia 

 protrude into the lumen. In the ootype these cilia are much more noticeable. 

 From the ootype the oviduct passes ventrally with a few coils, then across the 

 median line close above the receptaculum seminis as the beginning of the 

 uterus. The latter gradually enlarges as it passes forward across the median 

 line several times, until at about the middle of its course it has a diameter 

 of 85 to \oSn. As regards the terminal portion of the tube it was found that, 

 as Fuhrmann observed: "Der Endtheil der Uterus verengert sich und ver- 

 laiift von der Dorsalflache [the median frontal plane in which the last trans- 



