118 ILLINOIS BIOLOGICAL MONOGRAPHS [406 



(1853:89), Olsson (1867:56) and Carus (1885:120) did Httle more than list 

 the worm in their various works; so that it remained for Matz (1892:108) to 

 give the first comprehensive description of the anatomy, particularly of that 

 of the reproductive organs. Later, apart from reports by various workers 

 of the finding of the species, Olsson (1893:16) noted the infrequent occurrence 

 of the worm in the host, an increase in the number of segments by means of 

 transverse division and the variable form of the scolex; Ariola (1896:268, 272, 

 273, 280; 1900:393), Liihe (1899:43), Braun (1900:1676) and Fuhrmann (1902: 

 441, 447) dealt with it from a systematic standpoint; and fiinally Liihe (1910:25) 

 gave a short diagnosis, mostly after Matz, in placing it in his latest classifica- 

 tion of the Pseudophyllidea. 



According to Dujardin this species ranges in length from 25 to 540mm. (Ze- 

 der), but Luhe (1910:25) gave the length, presumably of average individuals, 

 as from 100 to 200mm. with a breadth of about 2mm. While the specimens 

 from Anguilla rostrata examined by the writer were quite small, fragmentary, 

 immature and much elongated, the longest piece, however, not exceeding 

 20mm., two from Eupomotis gibbosus, measured 155mm. in length by 2.9 in 

 maximum breadth, and were much contracted, as indicated in figure 19 of 

 the scolex. The latter, according to the authors, varies in preserved material 

 from an almost spherical shape, as mentioned by Goeze and Leuckart and 

 shown in the latter's Fig. 28, Taf. II, to the much elongate form shown in 

 Matz's Fig. 16, Taf, VIII. The tip of the organ may be protruded, flattened 

 or even replaced by a shallow groove which passes from bothrium to bothrium 

 in the sagittal plane, depending on the degree of contraction or relaxation. 

 These differences are brought out here in figure 23, the latter being more like that 

 of Matz. In either case a slight notch is to be seen on the surficial edges of the 

 terminal disc, while the bothria are deeper immediately behind these than poster- 

 iorly where they pass insensibly on to the base of the scolex. The segments have 

 been variously described, but Rudolphi's (1819:136) mention of " ... arti- 

 culis anterioribus brevissimis, mediis oblongis, reliquis subquadratis, margine 

 postico tumido " may be considered as indicating their condition in average 

 states of contraction. Matz stated that "Die gleich hinter ihm [the scolex] 

 beginnenden Proglottiden sind, wenn nicht contrahiert, ein Viertel oder ein 

 Fiinftel so lang als der Scolex. Die geschlechtsreifen Gheder sind 2mjn. breit 

 und ein halb bis drei Viertel mm. lang; man bemerkt an den Gliedern haufig 

 sekimdare Teilung, vde bei B. punctatus dadurch wohl bewirkt wd, dass der 

 Rand des vorhergehenden uber das nachfolgende Glied sich nicht erhebt, 

 hochstens deutet eine rings herumgehende Furche die Grenze an, wie es auch 

 bei B. imnctakis der Fall ist;" while Liihe (1910:25) said ''Die letzten 

 Proglottiden nahezu quadratisch oder sogar langer wie breit. " In the material 

 from Eupomotis gibbosus all of the anterior proglottides were found to be much 

 broader than long, on account of the contraction of the strobilae, while those 

 in detached pieces were from four to five times as broad as long, as shown in 

 figure 72. Apart from Matz, Olsson (1893:16) and Liihe (1910:25) have noted 

 secondary division of segments, or as Olsson stated the case, "Hos denna art 



