A New Species of Trematode 1 1 



receptacitltDii seminis (figs. 5 and 8). Occupying the entire space 

 between the two arms of the excretory bladder and lying poste- 

 rior to the ovary and ventral to the receptacuhun seminis is a 

 glandular mass quite diffuse and without a limiting membrane. 

 This is the shell-gland (figs. 5 and 8). Dorsal to the shell-gland 

 and posterior to the ovary and reccptaculiiiii seminis lies the 

 yolk reservoir, very close to the dorsal surface (figs. 5 and 8) 

 with its two afferent or transverse vitelline ducts, one coming 

 from either side, and its efferent duct leading to the ootype. 

 Between the yolk reservoir and the receptacidum seminis on the 

 left, is the proximal end of Laurer's canal (figs. 5 and 8). It 

 extends anteriorly and to the left, and opens on the dorsal sur- 

 face, generally at a point about midway between the ovary and 

 the left caecum of the intestine, opposite the junction of the 

 middle and posterior thirds of the ovary. In reaching this point 

 it passes dorsal to the left branch of the excretory bladder and 

 dorsal to the coil of the uterus. 



From the ovary a short oviduct passes to the posterior and always 

 has an enlargement about the size of an egg near its terminal 

 end. This enlargement is possibly a receptacuhun ovoriun for the 

 storage of eggs. At a point dorsal to the posterior portion of the 

 receptaculum, between the yolk reservoir and the ovary, the ovi- 

 duct joins a short duct from the receptaculum seminis and also 

 one from the yolk reservoir. Laurer's canal also connects with 

 these ducts at this point and the uterus begins here. This com- 

 mon point of meeting is surrounded by the diffuse shell-gland and 

 constitutes the ootype. 



The uterus is made up of numerous loose coils arranged in two 

 lateral fields entirely distinct from each other except where the 

 one joins the other just anterior to the anterior testis. These 

 fields lie ventral and medial to the intestinal caeca, never extend- 

 ing over their outer borders, and ventral to the central reservoir 

 of the excretory system. The coils pass toward the posterior on 

 the right side, cross in front of the testes, never extending poste- 

 rior to either of them, then pass cephalad on the left side. The 

 terminal portion passes to the left of the ovary and acetabulum as 



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