385] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



97 



terminal disc, widest anteriorly; length 1.0 to 3.5mm., breadth 0,3 to 0.5. 

 Bothria long and narrow, shallow posteriorly. First segments subcimeate 

 with weakly prominent posterior borders, longer than broad. Middle and 

 posterior segments much depressed, former very short and broad, latter rela- 

 tively less so and grouped in twos or threes; lateral borders crenulate. Ripe 

 proglottides 2 to 4mm. wide by 0.2 by 0.8 long. Strobila usually incomplete 

 posteriorly. 



Cuticula 5/i in thickness. Calcareous bodies 13/z in diameter. Inner 

 longitudinal muscles in fascicles. Six chief longitudinal excretory vessels. 



Opening of the genital cloaca at the bottom of a dorsal median longitudinal 

 depression running thruout mature segments, on a low papilla in each proglot- 

 tis and half-way between the anterior and posterior borders. Vaginal opening 

 immediately behind that of cirrus. Distinct ductus hermaphroditicus present. 



Testes subspherical, 35 to lOfi in diameter and 30 to 60 in each segment. 

 Vas deferens a compact mass lateral to cirrus-sac and opposite the uterine 

 tube, 0.18 by 0.10mm. Cirrus-sac at right angles to dorsal surface, 115 by 

 120 by 75 to 80^, extending only a short distance into the medulla; thick layer 

 of nuclei within its wall. Cirrus proper, not protruded, 65 by 15/z. 



Ovary compact, tubulolobular, 0.33mm. wide by 0.15 long where uterus- 

 sac is not greatly distended. Isthmus only ventral. Oocapt 35^i in diameter. 

 Vitelline follicles in two lateral weakly united fields on each surface, 350 to 

 540 in number, 35 to 55^ in diameter; vitelline reservoir small. Shell-gland 

 large, 115/i wide by 85^1 deep, median, close behind cirrus-sac. Uterine duct 

 voluminous on both sides of the median line, closely applied to ovary behind. 

 Uterus-sac spherical to flattened anteroposteriorly, occupies one-sixth of 

 transverse diameter of proglottis, alternating irregularly from side to side, or 

 often quite median. Opening in middle of sac, ventral and well forward, 

 formed by the rupture of a distinct membrane. 



Eggs, 66 to 80^1 in length by 43 to 45/x in diameter, without opercula, form- 

 ing dark brown maculations in ripe proglottides as they show thru the walls 

 of the uterus-sacs. 



Habitat: In the intestine of the host. 



