599 



suckers oval, 0.14"u.i long by 0.13mm (posterior) to 0.06'"m (an- 

 terior) broad; rostelluni long, thick, cylindrical 0.26mm 

 by 0.05mm, armed on anterior end with simple crown ol' 

 8 hooks 57 /i to 60 /* long, roots of about equail length. Neck 

 very long, much thinner than the head. Segments much 

 broader than long; anterior segments 5 times as broad as long; 

 posterior segments 3 times as broad as long, and somewhat 

 funnel shaped; segments become 0.25mm thick; thickness es- 

 pecially In the median line, which is traversed by a dark 

 longitudinal band; thinner and more transparent toward the 

 border; stralghter at the angles, the strobUa having a crenate 

 appearance. Genital pores unilateral in anterior halt ot mar- 

 gin. Calcareous bodies absent from the head, but present in 

 the neck and increase distally. Male organs begin to develop 

 in ca. one hundred and twentieth segment; 3 testicles present 

 in distal portion of segment, one me'dlan, two lateral; vas def- 

 erens runs diagonally toward proximal aporose corner of seg- 

 ment, swelling into a vesicula seminalis; near lateral margin 

 it turns, runs parallel to anterior margin and leads to cirrus 

 pouch, which also runs parallel to anterior margin of segment; 

 cirrus pouch lies on aporose side of median line and contain.s 

 a second vesicula seminalis, which communicates writh a very 

 long cirrus; genital cloaca 0.2mm to 0.3mm long by 0.03mm to 

 0.09mm broad, the broader portion being next to genital pore; 

 a row of spines at the point where the penis opens into the 

 cloaca; penis covered with minute spines. Female organs not 

 well understood; begin in ca. one hundred and forty-fifth seg- 

 ment; a median oval body and two lateral lobed bodies joined 

 together; a median receptacurum seminis runs cephalad and 

 diagonally, continues as vagina, which runs parallel to anterior 

 margin nearly entire breadth of segments, and opens intfi 

 cloaca near cirrus; a second larger lobed body = ? uterus. 



Development: Cercocystis Dr. fasclatae in Cyclops agilis, re- 

 corded by Mrazek. 



Hosts: White-fronted goose (Anser alblfrons); grayiag goose 

 (A. anser); tame goose (A. anser dom.). 



Geographical distribution: Denmark (by Krabbe); Germany 

 (by Feuereisen); Bohemia (by Mrazek). 



Zeder referred a tapeworm whieh he had found in a goo.sc 

 to T. crenata Goeze. which was reported from Picus major (.sec 

 Krabbe, 1869, p. 30».) Rudolphi (1810, pp. 139-140) renamed the 

 species fasciata. but does not appear to have oxamined it. 

 Feuerisen (T<6S. pp. 162-190) then di'termined von .Siphold's T. 

 fasciata Rud. as T. setigera Frolich, 1789, and the year fol- 



