605 



determination of Zeder-Ruolphl's species, but ignored syn- 

 onymy prior to Zeder. Thus we have no way of knowinB 

 whether the form now named slnuosa Is Identical wUh the 

 original slnuosa or not, and Dujardin is the earlleet author to 

 whom we can trace the present sinuosa with any degree of cer- 

 tainty. Authors generally follow Krabbe In accepting Dujar- 

 din's determination of Zeder's sinuosa and it will be well at 

 present to adopt this plan. 



The views concerning the life history of this worm rest upon 

 observations by Hamann, Mrazek, and von Linstow. Ilamann 

 (1889, pp. 1-7, Taf. I) found some cystlcercoids In Gammarus 

 pulex which von Llnstnw determined as the young of T. slnu- 

 osa. They were oval to spherical; tail surrounds body as a 

 yellowish border; 6 oncospheric hooks, 1.3 /< long, persistent, 

 one pair at end, one In middle, and one at beginning of tall; 

 tail 0.5mm, body with tail 1.3mm long; hooks of cystlcercold 50 

 u long, 10 in number; calcareous bodies numerous, 6 /i In diam- 

 eter, oval. Mrazek found a cystlcercold in Bohemia, 0.23min 

 long; tall moderately long, oncospheric hooks 11 /t; 50 calcare- 

 ous corpuscles present. He identllied this organism with Ha- 

 mann's larval form, and records It from Cyclops vlrdls Flsch, 

 C. agills Koch, and C. lucldulus Koch. So far as 1 can learn 

 no infections were made with these parasites. 



16. DRBPANIDOTAENIA SETIGERA (Frollch. 1789) Rallllet, 1893. 



(17,S9, Taenia setlgera Frollch; 1800, Alyselmlnthus setigerus 

 (Frollch, 1789) Zeder; 1803, Halysis setigera (Frollch, 1789) 

 Zeder; 1819, "Taenia slnuosa Rud.," 1810, of Rud., pars.— vide 

 Krabbe, 1869; 1848, "T. setigera Frolich,'' 1789, of Siebold; 1858. 

 T. tasciata Rud.," 1810, of Feuerelsen; 1869, "T. setigera Fro- 

 llch" of Krabbe.) 



[Pi. XII, figs. 147-150; Pi. XIII, flgs. 154-164.T 



Diagnosis: Strobila 20Omm long by 1mm to Jmm broad. Head 

 subglobular, 0.24mm long by 0.2Snim to 0.33mm broad; rostellum 

 with simiple crown of 10 hooks 35 /i to 43 /* (40 /J to 60 ^ long, 

 prong 20 /i long, roots 20 fi apart, after Peuerelsen); ventral 

 root short and plump, dorsal root longer. Suckers rather large, 

 elliptical. Neck, 0.59mm long by 1.16mm broad. (Segments very 

 short, 10 times as broad as long, Feuerelsen.) Anterior seg- 

 ments very short, the following slightly longer, tunnel shajped, 

 with very prominent posterior angles; chain traversed by a 

 daik median band. Pores unilateral, small, situated toward 

 anterior angle of the segment, frequently with extruding penis. 



