16 
Specific diagnosis. — Dibothrioceplialus (p. 15): Strobila attains 2 to 10 [or 20?] 
meters in length and 20 mm. in width; usually grayish yellow to brown in color; 
composed of 3,000 to 4,200 segments usually broader than long, especially in anterior 
two-thirds of strobila; posterior segments become quadrate or even longer than broad, 
like the segments of Tsenia. Head oblong, almond shaped, 2 to 3 mm. long, 0.7 to 
1 mm. broad, with groove-like suckers. Neck long, or short, thin. Gravid segments 
Fig. 1.— Strobila of the Broad Tapeworm 
{Dibothrioceplialus latus ); note the row 
of rosettes (uterus) in the median line. 
Natural size. (After Leuckart, 1886, 865, 
fig. 357.) 
Fig. 2. — Head and anterior end of same: a, side view 
of head; 6, ventral or dorsal view of head. x ca. 8. 
(After Leuckart, 1886, 865, fig. 358.) 
Fig. 3. — Tranverse sections of head of D. latus, to 
show form of suckers, x 31. ''After Braun, 1903, 
199, fig. 144.) 
Fig. 4. — Ventral view of three segments of D. latus: 
cir.o., male pore; va., vagina; ut., opening of uterus, 
through which eggs escape; in the third segment 
the cirrus (penis) is extruded. Enlarged. (After 
Eschricht, from Railliet, 1893a, 316, fig. 205.) 
usually measure 2 to 4 mm. long by 10 to 12, even 20 mm. broad; they gradually 
lose their eggs, so that posterior segments may be entirely devoid of them. Uterus 
with 4 to 6 loops each side of the median line. Calcareous corpuscles few. Eggs may 
appear 600 segments back of the head; they are brownish, elliptical, with a small 
operculum, and measure 68 to 71 // by 44 to 45 u ; laid during segmentation. Segments 
break loose in chains instead of singly. 
