27S ILLINOIS BIOLOGICAL MONOGRAPHS [278 



spherical, armed with many small hooks. Suckers large, heavily muscled, 

 protuberant, 0.25 mm. in diameter. Neck short, nearly broad as head. 

 Mature proglottids nearly quadrate. Ripe proglottids broader than 

 long, 1.46 mm. broad by 1.1 mm. long. Genital organs as in genus. 

 Genital pore marginal, irregularly alternating, near middle of pro- 

 glottid. Pore large, marked by a thickening of margin. Cirrus, when 

 protruded, short and filiform. Cirrus-pouch short and relatively small, 

 extending about one-fifth across proglottid breadth. No coils of ductus 

 ejaculatorius in pouch. Vas deferens, a mass of coils extending to mid- 

 dle of proglottid. Testes filling up field between vitellaria, about 120 in 

 number. Vagina posterior to cirrus-pouch. No coils of vagina anterior 

 to ovary. Ovary a bilobed, winglike structure. Vitellaria follicular, 

 situated in lateral fields. Uterus, a median tube with 18-20 lateral 

 pouches. Eggs, not described. 



Habitat: In the intestine of Malopterurus electricus ( ?), Egypt. 



Fritsch described and figured this form in 1886 as Taenia malop- 

 teruri. Monticelli (1891) included this species in his group of fish 

 cestodes. He did not describe it. Riggenbach (1896) considered this a 

 species of Ichthyotaenia. La Rue (1911:474) considered this to be a 

 species of Monticellia. 



Fritsch 's diagnosis reads: ^'Taenia malopteruri, Caput quadrangu- 

 lare, acetabulis quattuor, angulariter positis robustis. Rostellum hemis- 

 phaericum, spinis obtusis vel tuberculis minimus ornatum. Collum 

 mediocre. Aperturae genitalium marginales leviter circumvallatae. 

 Corpus sulco profundo per medium impressum. Articuli adulti dimido 

 fere longiores quam lati, proglottides breves, contracti. Habitat in 

 intestino Malopteruri." The description given by Fritsch is very in- 

 complete. However, he figures the head and a nearly ripe proglottid, 

 stating the magnification of the same. Since this is true one can secure 

 some size relations by measuring the organs portrayed in the drawings. 

 In doing this care must be used because in some respects the drawings 

 are not altogether clear, nor can one always determine the character of 

 certain organs. Nevertheless the writer has used these measurements in 

 the full realization that they were inaccurate but believing that they 

 probably are correct within the limits of variation of the species. Besides 

 the study of these drawings the description is based upon Fritsch 's 

 (1886) description. 



The length is not stated. In breadth the worm may measure as 

 much as 1.5 mm. The scolex (Fig. 154) is of fair size, 0.45 mm. in 

 diameter. It is quadrangular and bears four prominent suckers and an 

 hemispherical rostellum (?), armed with many small hooks. Suckers 



