606 



Genital organs begin with eight liundred and thirtietli seg- 

 ments; embryos begin with one thousand five hundredth seg- 

 ment. Calcareous bodies less numemus than in Dr. fasciata. 

 Male Cleans; Male maturity is reached about the one thou- 

 sand and thirtieth segment and is continued about 100 seg- 

 ments. Testicles three, 13 ^ in diameter, posterior; an uncer- 

 tain body (probably vesicula seminalis) lateral but near median 

 line; vas deferens parellel and near anterior margin; cirrus 

 pouch 0.3om"> long, more than half as broad as the younger 

 segments, parallel to and near anterior margin, 39 /* (median 

 portion) 19 /* (lateral portion) broad; broadest part is 160 H to 

 190 ft long and contains a vesicula seminalis O.lmin to 0.15min 

 long by 30 /* broad; penis covered with minute spines. Female 

 organs: Very imperfectly understood. A bddy appears on 

 aporose side of median line, develops and divides into two 

 pyriform bodies, which remain connected ( — ovary?); from 

 their point of juncture a canal runs toward the genital pore, 

 and shows two swellings, a median (? receptaculum, seminis) 

 and a lateral ( ? receptaculum seminis); an oval body (— ? 

 ovary) appears in the extreme aporose side of the segment, and 

 from this extends another body (uterus) toward the median 

 line, increasing in size as the (?) ovaries decrease. Oncospheres 

 19^, hooks 7.9 II. 



Development: Cercocystis Dr. setigerae in Cyclops brevicau- 

 datus Claus, found by Schmeil. 



Hosts: Tame goose (Anser anser dom.); white-fronted goose 

 (A. albifrons); bean goose (A. fabalis); barnacle goose (Branta 

 leucopsis); tame swan (Olor cygnus dom.) cited by \X)n Lin- 

 stow, but Railliet believes this erroneous; whooping swan 

 (Olor cygnus). 



Geographical distribution: Germany, France, Denmark, 

 Sweden and Ireland. Lucet found it producing a serious epi- 

 demic among the j-oung geese lyoiret (Railliet. 1S93, p. 301). 



The name Taenia setigera was proposed by Frolich (17S9, pp. 

 106-111) for a w-orm 3 feet long and 3 lines broad, with unilateral 

 genital pores, which he found in pastured geese. He states 

 that the rostellum is unarmed; the form is, like many earlier 

 species, not well described, and the figures are poor, so that 

 it is not possible to tell with absolute certainty what species 

 Frolich examined. Bellingham (184-1, p. 320) records it for Ire- 

 land. Von Siebold (1S4S. p. 131) states that in this species he 

 found 10 hooks on the rostellum. There is no way of proving 

 that Siebold's worm was Froliohs .=etigera: at the same time, 

 as there is no way of di.-jproving it, we may as well accept 



