CROW: TREMATODES OF KANSAS SNAKES. 129 



meters wide, and .92 millimeter thick. Body covered with short 

 spines. Oral sucker subterminal, .46 millimeter in length, .43 

 millimeter in width. Acetabulum sessile, .48 millimeter in 

 diameter. Pharynx moderate; oesophagus moderately long; 

 intestinal caeca simple, reaching to third fourth of body. Ex- 

 cretory vesicle Y-shaped ; long, voluminous median portion ; 

 crura short and extend very little past the middle of the body. 

 Testes two very large oval bodies ; the left slightly anterior to 

 right; behind ovary and acetabulum. Ovary immediately be- 

 hind acetabulum; large and oval in shape. Uterus very 

 voluminous ; metraterm long and muscular, genital pore in 

 front of acetabulum in median line. Egg .031 millimeter long 

 and .016 millimeter wide. Laurer's canal small; no recep- 

 taculum seminis. Cirrus-sac large; cirrus extends .523 

 millimeter beyond body wall. Yolk glands lateral, occupying 

 middle third of body. Parasite in the uterus of Natnx 

 rhombifera. 



Kenifer acetabulariss sp. nov. 



This worm was found in the mouth of Matrix rhombifera. 

 It is elliptical in outline, slightly concave on the ventral side, 

 while the dorsal side is cylindrical, a cross section thus being 

 almost a half of a sphere. In all of the specimens there was 

 a characteristic downward bend from the acetabulum forward. 

 In length the worm measured 1.56 millimeters, and .62 milli- 

 meter in width at the middle of the body. The thickness at 

 this place was .151 millimeter. The body is covered with 

 short, stiff spines. The suckers are very large and sessile. 

 The oral sucker is subterminal in position and measures .286 

 millimeter in length and .241 millimeter in width. The mouth 

 cavity occupies a little more than half of the space inclosed 

 by the sucker. The acetabulum, a very large, round, sessile 

 organ, is situated on the mid-ventral surface. It measures 

 .453 millimeter in diameter. 



The digestive system is made up of mouth, pharynx and two 

 intestinal cseca. The mouth is a funnel-shaped structure, open- 

 ing from the oral sucker directly into the pharynx. The pharynx 

 measures .081 millimeter in length and .074 millimeter in 

 diameter. The opening through the pharynx is nearly one- 

 third of the whole diameter of the organ. The intestinal cseca 

 branch off directly from the posterior end of the pharynx and 



