4 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol.63, 



fjenital pore to ovary. Vitelline glands in distinct lobes, 10 on the 

 right side and 9 on the left, on left side extending from midway 

 between ventral sucker and ovary to about the beginning of the 

 terminal fourtli of the body, on right side extending farther ante- 

 riorly, to a point two-thirds the distance from ovary to ventral 

 sucker. Testes in contact with each other, the posterior one a little 

 more than its own diameter from posterior end ; transverse diameters 

 slightly greater than longitudinal. Posterior testis from 0.225 by 

 0.256 mm. to 0.256 by 0.32 mm. ; anterior testis variable, smaller than 

 posterior one, in some specimens very markedly so, from 0,144 by 

 0.192 mm. to 0.224 by 0.288 mm. Cirrus sac very long, extending 

 in an open spiral from genital pore to ovary; about 0.106 mm. in 

 diameter posteriorly. Excretory system typical. Eggs 42 to 45[jl by 

 ] 8 to 20[;,, as measured from more or less collapsed eggs in preserved 

 specimens. 



Habitat. — Posterior portion of intestine of AmpMiima mea/)is, 

 from Louisiana. 



Ty2)e. — Deposited in United States National Museum, Helmintho- 

 logical Collections, No. 25170. 



TelorcMs stunkardi is of particular interest in being the only 

 species of its genus, of which about 24 species are known, which 

 occurs in an amphibian, all of the others being confined to reptiles. 

 The species is, however, a typical representative of the genus. Both 

 the oral and ventral suckers are of unusual size, in fact are rela- 

 tively larger than in any other species of the genus. Another inter- 

 esting and unusual characteristic is the tendency for the anterior 

 testis to vary in size. In all specimens it is distinctly smaller than the 

 posterior testis, and in some individuals very markedly so. In the 

 majority of the species of the genus the testes are of approximately 

 equal size, while in T. ercolanii the anterior one is larger. In respect 

 to extent of intestinal ceca, presence of esophagus and prepharynx, 

 position of genital glands and acetabulum, and general location of 

 vitellaria, it agrees fairly closely with T. ne?natoides, described from 

 Tropidonotus natrix in Europe, but in shape of body, in extent and 

 lobulation of vitellaria, and in arrangement of uterine coils, it more 

 closely resembles T. aculeatus^ described from Testudo in Europe 

 and said by Stunkard (1917) to occur in Tropidonotus grahamii in 



America. 



MEGALODISCUS, new genus. 



Body conical or horn-shaped, round in cross section. Oral sucker 

 large, with a pair of well-developed pharyngeal pockets with com- 

 mon median wall. Posterior sucker, facing postero-ventrally, ex- 

 tremely large, its diameter considerably greater than that of rest 

 of body, shallow, with raised rim and raised center, in the middle of 



