606 



Genital organs begin with eight hundred and tliirlieth seg- 

 ments; embryos begin with one thousand five hundredth seg- 

 ment. Calcareous bodies less numerous than in Dr. faseiata. 

 Male organs: Male maturity is reached about the one thou- 

 sand and thirtieth segment and is continued about 100 seg- 

 n;ents. Testicles three, 13 ji in diameter, posterior; an uncer- 

 tain body (probably vesicula seminalis) lateral but near median 

 line; vas deferens parellel and near anterior margin; cirrus 

 pouch 0.3'5mm long, more than half as broad as the younger 

 segments, parallel to and near anterior margin, 39 fi (median 

 portion) 19 fi (lateral portion) broad; broadest part is 160 ji to 

 190 II long and contains a vesicula seiminalis 0.1mm to 0.15mm 

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

 lorgans: Very imperfectly understood. A boldy 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 decre^use. Oncospheres 

 19/<, hooks 7.9 fi. 



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 von 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 young geese Doiret (Railliet, 1893, p. 301). 



The na,me Taenia setigera was pr&posed by Frolich (1789, pp. 

 106-111) for a worm 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. Rellingham (1844, p. 320) records it for Ire- 

 land. Von Siebold (1848, 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 Frolich's petigera; at the same time, 

 as there is no way of disproving it, we may as well accept 



