19 
Fig. 13. — A portion of the body wall of a fish ( Lota lota), containing a plerocercoid (infecting stage) 
of D. latus. Natural size. (After Braun, 1903, 201, fig. 150.) 
The Cordate Tapeworm — DIBOTHRIOCEPHALUS CORDATUS « (Leuckart, 
1863) Luehe, i8gg. 
[Figs. 14 to 20.] 
Specific diagnosis. — Diboihriocephalus (p. 15): Similar to D. latus, but smaller, 
attaining 80 to 115 cm. in length and composed of 400 to 660 segments. Head short, 
broad (dorso-ventrally), heart shape or arrow-head shape, 2 by 2 mm. ; suckers deep 
in forward half. Neck absent, segmentation beginning immediately at the head, the 
segments rapidly becoming broader, so that the cephalic end is more or less lanceo- 
late; only about 50 immature segments present, genital pores and genital primordia 
visible in specimens 80 mm. long; at 3 cm. from head, segments attain 7 to 8 mm. 
in breadth -and become mature; mature segments 3 to 4 mm. long, but may contract 
to 1.3 mm.; terminal segments nearly square 5 to 6 mm. Dorso- and ventro-median 
lines grooved. Calcareous corpuscles 28 to 30 ju, numerous. Longitudinal muscles 
very well developed. Cirrus-pouch 0.6 by 0.43 mm. Uterus with 6 to 8 lateral loops 
each side; eggs ellipsoid 75 to 80 by 50 u. 
Plerocercoid. — Unknown. 
Habitat. — Adults in dogs ( Cams familiaris ) in Godhavn, North Greenland; 
bearded seal ( Erignathus barbatus), Disco Island; walrus ( Odobenus rosinarus) . One 
case found in man in Greenland. Larva probably in fish. 
Medical significance. — Unknown at present; possibly accidental 
in man. 
a Synonyms. — Bothriocephalus cordatus Leuckart, 1863; Dibotkrium cor datum 
(Leuckart, 1863) Diesing, 1863a; Botriocephalus cordatus (Leuckart, 1863) Grassi, 
1880a. 
Bibliography. — For zoological discussion, see Leuckart, 1886, 930-941, figs. 394-401. 
