438 



FRESH-WATER BIOLOGY 



46 (33) Testes lie in two lateral fields between vitellaria; parasitic in am- 

 phibians, aquatic snakes, and lizards. 



Ophiotaenia La Rue 1911 . . 47 



Head globose or somewhat tetragonal. No rostellum. No hooks or spines. Suckers cir- 

 cular or oval, with margins entire. Fifth sucker vestigial. Neck usually long. Testes in 

 two long lateral fields anterior to ovary. Musculature weak. 



In aquatic snakes and Amphibia. 



47 (48) Vagina always anterior to cirrus-pouch, not crossing latter. 



Ophiotaenia filar oides La Rue 1909. 



Worms attenuate, small, thin, flat. Length 80 to no mm., maximum breadth about 0.80 



to 0.90 mm. Suckers deep, muscular, oval, maximum diameter 0.165 to 0.184 mm. First 



proglottids 0.30 to 0.36 mm. broad by o.io to 0.17 mm. long; mature proglottids quadrate or 



longer than broad; ripe proglottids from 1.6 mm. to 4.0 mm. long by 0.8 mm. to 0.75 mm. 



broad. 



Genital pore at end of first fifth of proglottid. Testes 70 to 114 in number. 

 Few coils in cirrus-pouch. Cirrus-pouch about 0.22 mm. long by o.n mm. 

 broad. Vitellaria with large follicles. Uterus with 25 to 35 lateral pouches on 

 each side. (For structure of mature proglottid consult figure 730, page 425.) 

 Intestine of Amblystoma tigrinum (Green); Nebraska and Kansas. 



FlG. 740. Ophiotaenia filarioides. Head of adult, magnified. (After La Rue.) 



48 (47) Vagina either anterior or posterior to cirrus-pouch 49 



49 (52) Genital pore anterior to middle of margin of proglottid. 



50 (51) Testes number 90 to 160. Ophiotaenia lonnbergii (Fuhrmann) 1895. 



FIG. 741. Opfitoiaenia lonnbergii. a, Head, b, mature 

 proglottid, magnified. (Alter Fuhrmann.) 



posterior to it. Vagina never crosses cirrus-pouch. 



In intestine of Neciurus maculosus Raf.; Ohio, Indiana. 



Length 170 to 190 mm., breadth up to 

 i .35 mm. Scolex 0.50 to 0.60 mm. broad. 

 Suckers measure 0.24 to 0.26 mm. long 

 by 0.14 to o. 2 2 mm. broad. First pro- 

 glottids about 0.5 mm. long by 0.50 mm. 

 broad; mature proglottids 0.85 to i.o 

 mm. square, or longer than broad, 

 measuring as much as 2.5 mm. long by 

 0.45 to 0.5 mm. broad. Ripe proglottids 

 not observed. 



Genital pore situated at end of first 

 one-third or two-fifths of proglottid. 

 Testes 90 to 160 in number, extending 

 lateral of excretory vessels and a few 

 into midzone. Cirrus-pouch 0.185 to 

 0.280 mm. long by 0.05 to 0.085 o,r o.io 

 mm. broad, with large mass of coils 

 Uterus with 25 to 40 lateral pouches. 



