PARASITIC FLATWORMS 



435 



34 (41) Functional fifth or apical sucker, absent or vestigial 35 



35 (t,8) Testes number 100 or more 36 



36 (37) Genital pore on lateral margin near center of proglottid. 



Proteoccphalus macrocephaliis (Creplin) 1825. 



As much as 40 cm. lonR by i to 

 1.8 mm. broad, or perhaps more. 

 Proglottids very numerous; first 

 much l)r(>ader than lonj,'; maturi.*, 

 broader than lonj,' or nearly cjuad- 

 rate; ripe, longer than broad. 

 Suckers 0.095 to 0.106 mm. in 

 diameter. Fifth sucker vestigial. 

 Testes 100 to 120, irregularly 

 scattered between vitellaria, ly- 

 ing in one or two layers, usually 

 one. Cirrus-pouch short, about 

 0.16 mm. long; ratio to proglot- 

 tid breadth i : 6 to i : 8. Uterine 

 pouches 7 to 14 on either side. 



Habitat: In intestine of An- 

 gxiilla vulgaris and A. chrysyPa 

 Raf. 



^ Fig. 733. Proleocephalus macrocephalus. a, Head. X 70; b, 

 ripe proglottid showing female reproductive organs. X 40. (After 

 La Rue.) 



37 (36) Genital pore on lateral margin anterior to center of proglottid. 



Proleocephalus per plexus La Rue 191 1. 



Length as much as 155 mm.; maximum breadth 1.7 mm. First proglottids much broader 

 than long; mature proglottids 1.70 mm. broad by 0.595 mm. long; ripe proglottids quadrate 

 or longer than broad. Suckers, 0.340 to 0.459 "im. long by 0.255 to 0.272 mm. broad. \o 

 vestige of fifth sucker. 



Genital pore at end of 

 first fourth or half of 

 proglottid. Cirrus-fM)uch 

 0.30 to 0.344 mni. long, 

 extending to one-third or 

 one-fifth width of proglot- 

 tid. Testes 135 to 155 in 

 number, in one layer an- 

 terior to ovar>'. \'agina 

 anterior to cirrus-pouch, 

 never crossing same. Vi- 

 tellaria extend to posterior 

 margin of proglottid and 

 parallel to it. L'teruswith 

 20 to 25 lateral pouches 

 on each side. 



Hal)itat: In intestine of 

 Fig. 734. Proleocephalus perplexus. a. Head. X 36; b, ripe proglottid, -^'"i^ ^^^^'^ and Le pi so stats 

 reconstruction showing male reproductive organs (U, testes), and ovary. Piatosiomus. llunois,.^orin 

 Note also position of sphincter vaginae (I'aj). X 36. (.\fter La Rue.) Carohna. 



38 (35) Testes number less than loo 30 



39 (40) Suckers with pointed apex and shallow cavity. 



Proleocephalus singular is La Rue 191 1. 



Strobila long, slender, up to 170 or even 250 mm.; maximum breadth 0.90 to i.o mm. Head 

 small, suckers large. No vestige of fifth sucker. First prt)gli)liids brt)ader than long; mature 

 proglottids 0.85 mm. broad by 0.34 to 0.37 mm. long; riin- proglottids longer than bri>ad or 

 quadrate. Old spent proglottids up to 2.0 mm. long by 0.4 mm. broad. 



Genital pore at end of first one-fourth to one-half of proglottid. Testes 75 to So or 90, m a 



