4071 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



119 



framtrader mycket tydligt och allmant en forokning af lederna genom tvar- 

 delning; man finner nasten hvarje led genom en svagt framtradande tvarlinie 

 deladt i tva lika led, hvartdera med hanliga och honliga organ, om moderledet 

 haft sadana. Afven die konlosa leden visa samma forokningssatt, " which, 

 however, is what Dujardin observed in 1845 when he said that "On remarque 

 en ontre que souvent les articles sont tellement unis deux a deux, que chaque 

 couple parait n'en faire qu'un seul avec une vide transverse et deux appareils 

 genitaux, I'un devant I'autre. " This pairing of the ripe proglottides, also 

 shown here in figure 72, is due to the manner of segmentation which is like 

 that described for B. scorpii, only quite regular, since the reproductive rudi- 

 ments appear relatively farther forward in the strobila and seem to be more sta- 

 ble in development. Concerning this method of increase in the number of 

 segments for this species Liihe (1910:25) said, "Zwei aufeinanderfolgende 

 Genitalsegmente ausserlich haufig nur unvolkommen geschieden, indessen 

 fehlen durchgehende Querfurchen auf den Flachen nie auf so weite 

 Strecken wie bei B. punctalus." On account of the great degree of con- 

 traction of the only two strobilas provided with scolices at hand, the 

 primary segments were not followed with entire satisfaction very far beyond 

 the scolex, but the first two were seen to be divided into four sub- 

 segments each — the first one, shown in figure 19, including the four segments 

 to the * at the side of the figure — with some indication of the next division 

 which would result in eight to the primary segment; the third into eight, and 

 so on. There were indications posteriorly, however, that the primary segment 

 consists of at least 32 genital segments or proglottides, but as in B. scorpii 

 the furrows separating sets of 16, 8 and 4 genitalia become almost as prominent 

 as those between the groups of 32, while even those separating pairs are not 

 as faint as Olsson (1893:16) stated and showed in his Fig. I, Tab. II. At all 

 events it should be emphasized that the furrows are more distinct and con- 

 sequently the proglottides better defined, at least externally, than in B. scorpii. 

 In the material studied the segments quickly broaden behind the scolex to 

 2mm. at a distance of 20mm. from the latter, and then very gradually attain 

 the maximum width. The following table gives the measurements of the 

 three largest specimens at hand: 



The cuticula, between only 1 and 2/i in thickness, is difl5cult to distinguish 

 from the finely matted and comparatively dense cuticular musculature. The 



