NO. 14 MANTER: DIGENETICTREMATODES OF FISHES 441 



cretory vesicle. Genital pore opposite pharynx. Testes tubular, irregularly 

 segmented, in region immediately postacetabular ; vasa efferentia swollen; 

 vas deferens coiled, tubular; prostatic cells free; no cirrus or cirrus sac; 

 genital atrium large. Ovary globular (or follicular ?), posttesticular ; 

 uterus very well developed, extending to near posterior end of body, in 

 many narrow transverse coils filling most of hindbody and covering all 

 organs, only slightly coiled in forebody; uterine seminal receptacle pres- 

 ent; vitellaria tubular or more or less segmented into elongate follicles, 

 anterior and posterior to ovary. Eggs small, thick shelled. Excretory 

 vesicle short ; lateral collecting tubes bend posteriorly to posterior end of 

 body, then extend coiling to extreme anterior end, forming a ring (with 

 branches) around the anterior edge of oral sucker. Type species: P. 

 vaginicola Dollfus, 1937. 



SPECIFIC DIAGNOSIS OF PARONATREMA MANTAE 



Length 17.5 to 19.8; greatest width (just posterior to acetabulum) 

 4.18 to 4.61. Forebody 6.68 to 7; hindbody 6.3 to 8.4. Oral sucker 1.809 

 to 1.971 in transverse diameter, with an internal ring of 41 to 47 acces- 

 sory suckers. Acetabulum 3.064 to 3.591 in transverse diameter; sucker 

 ratio approximately 1 :2. Acetabulum with a ring of 29 to 37 accessory 

 suckers. Pharynx 1.147 to 1.215 long by 0.634 to 0.815 wide. Esophagus 

 lacking or very short ; ceca bending anteriorly to midpharynx level where 

 small cecal pouches (the "Drusenmagen" of Buttel-Reepen, Muhlschlag, 

 and Odhner) occur; ceca sinuous. Genital pore submedian, opposite an- 

 terior edge of pharynx. Testes irregularly tubular, more or less seg- 

 mented, from posterior edge of acetabulum halfway to ovary; seminal 

 vesicle sinuous from atrium to midacetabulum ; prostatic gland from base 

 of atrium to slightly posterior to pharynx. Ovary median, smooth, 

 globular; shell gland at posterior edge of ovary; vitellaria irregularly 

 tubular, fragmented, from posterior edge of testes to near posterior end 

 of body, becoming segmented posteriorly; uterus very long with many 

 transverse coils, filling most of body from one side to the other, covering 

 ceca and other organs ; eggs with very thin shells until near the acetabu- 

 lum, then with very thick shells, 24 to 25.5 by 19 to 22 /x; metraterm 

 projecting into atrium; atrium ovoid, thick walled, with external muscles. 

 Excretory pore terminal, vesicle short and wide; lateral tubules directed 

 backward to posterior end (fig. 132), then (in sinuous curves and with 

 branches) forward to extreme anterior end where they are connected by 

 a sinuous branched ring around the anterior end of oral sucker. 



