. Fresh-water biology. Freshwater biology. Uterus FRESH-WATER BIOLOGY Anomotaenia Cohn 1900. Rostellum with double crown of hooks, with long dorsal and short ventral root, and long blade. Genital pores near anterior border of segment. Genital canals pass between the longitudinal excretory vessels and dorsal of the nerve. Vas deferens coiled, seminal vesicle absent. Testes numerous, in posterior portion of segment (or rarely laterally on both sides of the female glands). Adults in birds and mammals. Many species from both land and water birds in Europe. A. con- stricta from the fish
. Fresh-water biology. Freshwater biology. Uterus FRESH-WATER BIOLOGY Anomotaenia Cohn 1900. Rostellum with double crown of hooks, with long dorsal and short ventral root, and long blade. Genital pores near anterior border of segment. Genital canals pass between the longitudinal excretory vessels and dorsal of the nerve. Vas deferens coiled, seminal vesicle absent. Testes numerous, in posterior portion of segment (or rarely laterally on both sides of the female glands). Adults in birds and mammals. Many species from both land and water birds in Europe. A. con- stricta from the fish crow, determined for U. S. A. by Ransom. Many European hosts of other species are found in North America. Fig. 755. Anomotaenia constncta. Male and female reproductive organs, magnified, fAfter Volz.) Uterus branching and in ripe p'roglottids incompletely divided into numerous small communicating cornpartments. 100 loo '101) One crown of hooks on the rosteUimi. Choanotaenia RaOliet 1896. Scolex small. Rostellum armed with single crown of hooks usually with long dorsal and short ventral root. Proglottids numerous, rarely less than 30; oldest often longer than wide. Genital pores irregu- larly alternate near anterior border of proglottid. Genital canals pass between longitudinal excretory vessels and dorsal of nerve. Vas deferens coiled, seminal vesicle absent. Testes numerous, in posterior region of, or more rarely laterally on each side of, the female glands. Uterus subdivided into ninnerous small communicating chambers incompletely sepa- rated by partitions infolded from wall so that in some cases eggs appear almost as if isolated in parenchyma. Adults in birds and mammals. A dozen species or more from North American hosts; land, shore and water birds represented. Ch, T. c r^7 . • • J- ^-L T infundibulum is common in chickens and is recorded a^Hook'from S"eut,Tma^S;":g" for North America generally p. #»r«a occurs in a ment showing reproductive organs; magn
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
