447] PSEUDOPHYLLIDEA FROM FISHES— COOPER 159 



(Diesing) was dealing with much contracted specimens, the length being cited 

 as ranging from one and a half lines to two inches. Ariola (1900:397) gave the 

 following description of the segments: 



"Strobila anteriormente assai piu stretto dello scolice, a guisa di peduncolo; 

 le primi proglottidi sono rettangulari, strette, ma rapidamente si allargano; 

 raggiunta la massima dimensione, la conservano sino all ultimo tratto del 

 corpo, dove nuovamente si restringono. Le proglottidi mature hanno angula 

 posteriori appena visibili; le ultime presentano forma trapezoidale. " And 

 Johnstone (1909:89) stated, "The posterior proglottides are much broader 

 (in the transverse axis of the strobila) than they are long (in the longitudinal 

 axis of the strobila) ; and their anterior extremities are narrower than the pos- 

 terior ones, so that the edge of the strobila appears to be serrated. Secondary- 

 segmentation of the proglottis often occurs. " 



In fine, Wagener, Diesing, and Johnstone are, to the writer's knowledge, 

 the only writers who have referred to this spurious articulation or subdivision 

 of the segments into false secondary segments — although Liihe (1902:629) 

 repeated the statements of the first two authors. Furthermore, Wagener 

 did not figure the adult strobila of the species to show the structures in ques- 

 tion, but in the legend for his figure 79, Taf. 7 of Dibothrium heteropleurum, — 

 now Amphicotyle heteropleura (Diesing) — says only that "Man sieht die 

 articulo spurio, welche die echten Glieder, wie bei Dibothrium crassiceps, in 

 der Mitte theilt"; and further, as regards the difference in structure of the sides 

 of this species, "Der Schein entsteht durch die noch dichtere Zusam- 

 mendrangung der Falten der wahren und falschen Glieder auf der concaven 

 Seite. " In the legend (p. 61) for his figure 6, the egg of C. crassiceps, he also 

 said that " Jedes Glied hat in der Mitte eine Falte, die ihm das Ansehen giebt, 

 als bestunde es aus zweiGUedem." Thus, there is reason to believe that for 

 this species no one (apart from Linton's Fig. 268) has as yet described nor 

 figured what the writer here calls spurious articulations, but that these workers 

 were referring to the secondary division of the segments of the anterior end 

 of the strobila which proceeds in the manner described for B. scorpii et al., 

 altho not so clearly (Figs. 48 and 58). This is borne out by the fact that the 

 spurious articulations described here never reach the m.edian line of the strobila, 

 much less pass completely across it as do the true posterior borders of the pro- 

 glottides (Fig. 74). In one moderately relaxed strobila the first segment show- 

 ing spurious articulations appeared 11.7mm. from the tip of the scolex, while 

 in another which was quite contracted, especially anteriorly, 4.8nmi. In the 

 former case the next two pairs of these structures — and aU of these in question 

 happened to be bilaterally symmetrically situated — appeared in the fourth 

 and thirteenth segments following. 



Posteriorly the uterus-sacs appear as a series of gradually enlarging, dark 

 punctations, as described below, not so pronounced, however, as in B. scorpii. 

 The measurements of the first proglottis showing eggs in the uterus-sac 

 in a fairly relaxed strobila at hand were 0.50mm. in length by 0.92 in 

 breadth, while for one farther back where the uterus-sac was 0.61 by 0.48 



