ABT. 17 PAEASITES OF AMPHIBIA AND EEPTILIA HABWOOD 29 



esophagus is less than half as long as in Stunkard's species, the testes 

 lie in juxtaposition, and the uterus overlies the intestinal ceca. 

 Other differences, which may be of importance if checked carefully 

 with a larger supply of material, are: The size and shape of the 

 acetabulum, the distribution posteriorly of the vitellaria, and the 

 positions in the body of the acetabulum and ovary. 



The foregoing description is based on four specimens taken from 

 a single turtle, which was given to me by Dr. Don. O. Baird, of the 

 Sam Houston State Teachers College. I have, therefore, named the 

 species in his honor. 



CERCORCHIS ROBUSTUS Goldberger. 1911 



This species was first described by Goldberger (1911) ; it was 

 redescribed by Stunkard (1916). I have nothing to add to the de- 

 scription as revised by Stunkard. My specimens that are referred 

 to this species come from the intestine of two examples of Pseudemys 

 elegans, taken at Houston and Rosenberg, Tex. 



Genus PROTENES Barker and Covey, 1911 



The genus Protenes is very closely related to Gercorchis^ from 

 which it differs only in the position of the genital pore. The first 

 known species was described by Stafford (1900) as Vhtomum an- 

 gustuni and the second by Barker and Covey (1911) as Telorchis 

 leftus. These authors established for their species and Stafford's 

 the subgenus Protenes. Stunkard (1916) raised Protenes to generic 

 rank. The following adds the third species to this genus. 



PROTENES CHAPMANI, new species 



Plate 2, Figure 8 



SpeciflG diagnosis. — Protenes: One worm measures 3 mm long by 

 0.4 mm in maximum width, and the other is 3.1 by 0.5 mm. The 

 body is of relatively even breadth, the widest part being in the 

 region of the ovary. Very small spines are buried in the cuticula. 

 Near the oral sucker these spines are about 3/x long and arranged 

 in rows about 3/i apart. Caudad the rows are farther apart; at the 

 level of the genital pore they are about 5/* apart and at the level of 

 the ovary 10/i, apart. Beyond the ovary the rows become even farther 

 apart until near the caudal end the spines disappear. The cuticula 

 is about 2f(, thick. The acetabulum is 0.77 to 0.88 mm from the 

 anterior end ; that is, about one-fourth the body length. It is circular 

 and is 0.11 mm in diameter. The oral sucker is slightly larger and 

 somewhat oval, the transverse diameter being the longer. It meas- 

 ures 0.13 by 0.15 mm in one specimen and 0.13 by 0.17 mm in the 



