438 FRESH-WATER BIOLOGY 



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

 phibians, aquatic snakes, and lizards. 



Ophiotaenia 1,3. Kue igii ■ ■ 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 filaroides 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 nam. 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 iu number. 

 Few coils in cirrus-pouch. Cirrus-pouch about 0.22 mm. long by o.ii 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 Ambly stoma tigrinum (Green); Nebraska and Kansas. 



Fig. 740. Ophiotaenia JUarioides. 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 



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



Fig. 



Ophiotaenia tSnnbergii. _ , . _ 



proglottid, magaified. (After Fuhrmann.) 



posterior to it. Vagina never crosses cirrus-pouch. 



In intestine of Nsciunis macutosus Raf.; Ohio, Indiana. 



Length 170 to 190 mm., breadth up to 

 1.35 mm. Scolex 0.50 to 0.60 mm. broad. 

 Suckers measure 0.24 to 0.26 mm. long 

 by 0.14 to 0.22 mm. broad. First pro- 

 glottids about o.s 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 

 0.4s 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 or o.io 

 mm. broad, with large mass of coils 

 Uterus with 25 to 40 lateral pouches. 



