PARASITIC FLATWORMS 435 



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



35 {38) Testes number 100 or more. . 36 



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



Proteocephalus niacrocephalus (Creplin) 1825. 



As much as 40 cm. long by i to 

 1.8 mm. broad, or perhaps more. 

 Proglottids very numerous; first 

 much broader than long; mature, 

 broader than long or nearly quad- 

 rate; ripe, longer than broad. 

 Suckers 0.095 to o.io5 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- 

 guilla vulgaris and A. chrysypa 

 Rat. 



_ Fig. 733. _ Proteocephalus macrocepkalus. a. Head. X 70; &, 



ripe proglottid showing female reproductive organs. 

 La Rue.) 



X40. (After 



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



Proteocephalus perplexus 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 mm. long by 0.255 to 0.272 mm. broad. No 

 vestig3 of fifth sucker. 



Genital pore at end of 

 first fourth or half of 

 proglottid. Cirrus-pouch 

 0.30 to 0.344 mm. long, 

 extending to one-third or 

 one-fifth width of proglot- 

 tid. Testes 135 to 155 in 

 number, in one layer an- 

 terior to ovary. Vagina 

 .J- anterior to cirrus-pouch, 

 ' never crossing same. Vi- 

 tellaria e-xtend to posterior 

 margin of proglottid and 

 parallel to it. Uterus with 

 20 to 25 lateral pouches 

 on each side. 



Habitat: In intestine of 

 Fig. 734. Proteocephalus perplexus. o. Head, X 36; 6, ripe proglottid, Ajnia cdva a.MLepisosteus 

 reconstruction showing male reproductive organs (.ti, testes), and ovary. Patostomus. Illinois, JNortn 

 Note also position of sphincter vaginae (ua5). X 36. (After La Rue.) Carohna. 



38 (35) Testes number less than 100 39 



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



Proteocephalus singularis 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 proglottids broader than long; mature 

 proglottids 0.85 ram. broad by 0.34 to 0.37 mm. long; ripe proglottids longer than broad 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 80 or 90, in a 



