30 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



other. The prepharynx is very short, being but Sfx to 10/a long. 

 The pharynx varies in size from 76/a by 90^1 to 72/a by 82ju,. It is 

 longer in the transverse diameter. Curiously, the pharynx of one 

 specimen seems to be perfectly normal, while that of the other seems 

 to be divided into quadrants as described by Barker and Covey 

 (1911) for Protenes leptus. The length of the esophagus varies ap- 

 preciably. In one specimen it is 0.18 mm long and in the other only 

 0.12. Oddly the small specimen has the longer esophagus. The in- 

 testinal ceca end in the posttesticular region near the caudal end of 

 the body. The ovary is 1.14 to 1.08 mm from the cephalic end and 

 0.3 to 0.28 mm from the acetabulum. Therefore, it is slightly caudal 

 to the end of the first third of the body length. It measures 0.12 by 

 0.09 mm. The structure in this region is very similar to that de- 

 scribed by Barker and Covey. A short oviduct leads to the ootype 

 directly caudal to the ovary, a well-developed Mehlis's gland sur- 

 rounds the ootype while just at its caudal boundary it is joined by 

 the common vitelline duct. A small vitelline reservoir is present. 

 Laurer's canal leaves at this point, and in the one specimen in which 

 it could be traced with certainty, it extended laterad, to open on the 

 dorsal surface 84-/x below the ovary, at the median edge of the in- 

 testinal ceca of the left side. The other specimen was mounted with 

 the ventral side uppermost; and while the actual pore of Laurer's 

 canal could not be seen, the duct could be traced to the same posi- 

 tion. No seminal reservoir could be seen although the location was 

 searched with an oil immersion objective. The upper part of the 

 uterus and the proximal portion of Laurer's canal were filled, in 

 both specimens, with a deeply staining mass, in appearance not unlike 

 the tangled mass of spermatozoa in the male system of this fluke. 

 The uterus extends caudad in undulating coils on the left side of 

 the body to the testes, then turns cephalad, and returns on the right 

 side of the body. Cephalic to the ovary there are very few waves 

 in the uterus. The metraterm is but poorly differentiated. The 

 vitellaria are extra cecal in the lateral fields. Their most cephalic 

 extent is slightly more than the width of the ovary posterior to that 

 structure, and the most caudal extent is slightly more than the long 

 diameter of the testis cephalic to the anterior testis. The testes lie 

 in the posterior region in juxtaposition. They are oval bodies with 

 the longest diameter in the transverse direction. They are of about 

 equal size and measure 0.13 to 0.14 mm by 0.15 to 0.17 mm. The 

 caudal testis is about twice its long diameter from the caudal end. 

 As is usual for this genus the genital pore is in advance of the 

 acetabulum, dorsal in position and near the lateral margin. In 

 opposition to the other two known species, the cirrus sac and uterus 

 of this species pass ventral to the right intestinal ceca, and both open 



