NO. 6 gilbert: three new trematodes 93 



nipple-like into a terminal chamber which surrounds the cirrus except 

 at its basal portion (fig. 2). The ejaculatory duct is thick-walled, 

 but narrow. At its distal end it communicates with the terminal 

 chamber; at its proximal end it joins a narrow, flattened chamber 

 which appears to be a horizontal widening of the ejaculatory duct 

 at the base of the cirrus (fig. 2) and communicates posteriorly with 

 the lumen of the prostatic region. The genital pores are separate, the 

 male pore lying slightly to the right of the female pore. Both pores 

 are located just anterior to mid-body level and a little to the left 

 of the median line. 



The ovary is slightly lobed, lying in the median line just anterior 

 to the testes. The large shell gland complex lies close to the posterior 

 margin of the ovary. The gland is surrounded by a capsule of con- 

 nective tissue. There is no seminal receptacle. Laurer's canal is pres- 

 ent, extending from the anterior level of the shell gland to the dorsal 

 surface, a little anterior to the ovary. The large follicles of the 

 vitellaria are arranged in a linear series lateral to the ceca, and at 

 the outermost boundaries of the uterine coils, fifteen on the right 

 side and seventeen on the left. These follicles extend from the an- 

 terior level of the testes to the anterior level of the seminal vesicle 

 (fig. 1). The uterus extends from the region of the ovary in trans- 

 verse coils which overlap the ceca, to the very weak metraterm to 

 the left of and slightly posterior to the anterior portion of the cirrus 

 sac. The small eggs have thick shells which continue terminally to 

 form a single long filament at each pole (fig. 4). The eggs measure 

 18 to 22 by 8 to 13 /x. The longest filaments are 63 ix and are found 

 on eggs in the anterior portion of the uterus. 



The excretory pore is on the dorsal median surface, near the 

 posterior end of the body. The excretory vesicle is narrow, and ex- 

 tends to the level of the shell gland where it branches to form two 

 limbs which continue anteriorly, lateral to the ceca. Blunt projec- 

 tions or pockets are present on the outer margins of the limbs and 

 the inner margins give off numerous branches which not only anas- 

 tomose with branches from the opposite limb, but also with other 

 branches anteriorly and posteriorly, forming a network of excretory 

 vessels especially in the anterior half of the body. The limbs of the 

 excretory vesicle do not unite at their anterior extremities, but end 

 blundy at the level of the esophagus (fig. 1). 



