394 FRESH-WATER BIOLOGY 



92 (93) Genital pore anterior to and near acetabulum; cirrus sac very long 

 extending far behind acetabulum to round ovary. 



Telorchis Liihe 1899. 



Small to middle sized distomes. Musculature light; hence worms translucent. _ Testes 

 close together, near posterior end, separated from ovary which lies at the end of the cirrus sac 

 and near the center of the body, by a mass of uterine coils. Excretory vesicle long, median, 

 extends anteriad about to ovary where it forms two lateral branches. 



Species distinguished by length of esophagus and direction and extension of uterine coils. 

 Cercorchis Liihe with esophagus and having uterine coils entirely intercecal, grades into Telorchis 

 s..§tr. Liihe (without esophagus and with uterus coiled beyond ceca), and cannot be accepted 

 as a valid subgenus. 



Apparently confined to reptiles; six or more species in North America". Revision of genus 

 by Stunkard. 



(After Stunkard.) 



93 (92) Genital pore dorso-lateral, separated by marked interval from ace- 



tabulum. Cirrus sac entirely preacetabular. 



Protenes Barker and Covey 191 1. 

 Two species, P. leptus Barker and Covey and P. angnstiis (Stafford) in North America. 

 From Chrysemys marginata and C. picta. 



94 (83) Ovary lateral; testes either median or slightly lateral 95 



95 (96) Ovary separated from acetabulum by coils of uterus. 



Plagioporus Stafford 1904. 



Small, fusiform distomes with acetabulum larger than oral sucker and anterior to middle 

 of length. Skin smooth. Pharynx and esophagus present; crura extend to posterior end. 

 Testes median, close together in center of postacetabular region. Ovary small, lateral, just 

 in front of anterior testis. Uterus from ovary to acetabulum. Genital pore lateral, on level 

 of intestinal bifurcation. Cirrus sac large, preacetabular, obliquely transverse. Vitellaria 

 lateral, from esophagus to posterior end. 



Only species known Plagioporus serotinus Stafford 1904. 



Intestine of large-scaled sucker {Moxosionia macrolepidotum) in Canada. 



96 (95) Ovary close to acetabulum, at least not separated from it by coils of 



uterus 97 



97 (104) Testes large, in posterior region of body, separated from ovary by 



small uterus with few eggs; or when eggs are numerous, 



they extend beyond testes into posterior end {Bunodera 



only). . . Family Allocreadiidae Odhner 1910 . . 98 



Distomes of small to moderate size; body attenuated and mobile 'anteriorly. Suckers 



well developed. Pharynx and esophagus present; crura long, but not reaching posterior end. 



Genital pore near acetabulum or not more than halfway to oral sucker, median or sHghtly 



lateral. Ovary lateral, behind but not far from acetabulum. Testes large, proximate, in 



posterior region halfway or more from acetabulum to posterior end. Vitellaria lateral. Eggs 



large. 



Parasites of fishes; rarely of higher vertebrates. 



98 (103) Uterus short with few coils, between anterior testis and acetab- 



ulum. 



Subfamily Allocreadiinae Odhner 1905 . . 99 

 Acetabulum at end of first third or fourth of total length. Excretory bladder single, un- 

 divided, sac-shaped, rarely pyriform. Genital pore preacetabular, median or slightly lateral. 

 Cirrus and sac large, well developed. Testes large, proximate, median or oblique in posterior 

 region. Ovary spherical or lobed, close between acetabulum and testes, not median. Vitel- 

 laria lateral, well developed, partly covering crura, often confluent behind testis. 

 Eggs not numerous, usually large. 



