no. 1817. A NEW TREMATODE—GOLDBERGER. 237 



It is placed in the same side of the intercecal area as is the caudally 

 placed testis within whose field the ovarian field falls. The oviduct 

 springs from the dorso-mesial aspect of the ovary and tends dorso- 

 mesially and caudad. Almost immediately after its origin it receives 

 a short duct from the receptaculum seminis; a little beyond this 

 point it gives off a duct that passes caudad close to the ventral aspect 

 of the receptaculum seminis at the level of the caudal margin of which 

 it dilates into a globular body of about the size of the ovary (fig. 3) . 

 This duct corresponds, in its relation to the oviduct, and in its struc- 

 ture, to Laurer's canal, but instead of passing to and opening on the 

 surface it ends in the manner described for Laurer's canal in Aspido- 

 g aster conchicola. The globular cecal end of this canal contains 

 spermatozoa, sperm-morulas, round deeply staining bodies suggesting 

 nuclei and a few vitelline cells. Immediately after the origin of 



■ ov. cC. 



Fig. 3.— Diagram to show relations of Laurek's canal and 

 its globular end. c. vd., common vitullo-duct; ov. d., ovi- 

 duct; r. s., receptaculum seminis; s. g., shell gland; t. vd., 

 transverse vitello-duct. (For other lettering see fig. 1.) 

 Original. 



Laurer's canal the oviduct enters an ill-defined, irregular mass of 

 cells forming the shell-gland within which it is joined by the common 

 vitelloduct to form the ootype. The shell gland lies close to the 

 mesial and mesio-dorsal aspect of the ovary and close to the ventral 

 aspect of the receptaculum seminis. The seminal receptacle is an 

 ovoid structure somewhat larger than the ovary close to the dorso- 

 caudal aspect of which it lies; it is filled with spermatozoa. The 

 uterus, a continuation of the ootype, emerges from what may be 

 regarded as the ventral aspect of the shell gland, passes ventrad, 

 then caudad. The uterine coils extend to quite near the caudal 

 margin; they fill the posttesticular portion of the intercecal area and 

 its extension caudad. There is a descending and an ascending 

 uterine limb that may be distinguished by the difference in the tint 

 of the contained eggs, the eggs in the ascending limb being the darker. 

 Both limbs form transverse coils in adjacent (right and left) lateral- 



