. A manual of zoology. Zoology. 106 TROTOZOA Order II. Heterotricha. I^ikc the TTololricha tlic Iletorolricha arc cvcrvwhcrc ciliated, l>ul they have a tract of slninger cilia, the adoral ciliatetl spiral, beginning at some distance from the cvtostome and leading in a spiral course into the moutli. It consists of rows of cilia united into imiiibraiicllic placed at right angles to the course of the spiral. In the SInilors'''' (fig. 153), the peristomial area, surrounded by the spiral, forms the broader enci of the body, which ta]icrs toward the other end, bv which the animal may attach itsel
. A manual of zoology. Zoology. 106 TROTOZOA Order II. Heterotricha. I^ikc the TTololricha tlic Iletorolricha arc cvcrvwhcrc ciliated, l>ul they have a tract of slninger cilia, the adoral ciliatetl spiral, beginning at some distance from the cvtostome and leading in a spiral course into the moutli. It consists of rows of cilia united into imiiibraiicllic placed at right angles to the course of the spiral. In the SInilors'''' (fig. 153), the peristomial area, surrounded by the spiral, forms the broader enci of the body, which ta]icrs toward the other end, bv which the animal may attach itself. Muscle fibres running lengthwise immediately under the cuticle produce energetic moxements. Balaiilidiiim coli (fig. 154) appears in the large intestine of men ill with diarrhwa, it also occurs in swine without causing sickness. Other jiarasites of man are B. iiiiiiiiliiiii and Xyciotlicrus faba. Order III. Peritricha. The Peritricha have a broad peristome area around the cytostome; the oppo- site end has a corresponding pedal disc or is narrowed like a goblet and ends in a stalk (fig. 155). Only the adoral ciliated siiiral is constant. It arises from the swollen margin of the peristomial area, and continues on the 'operculum,' a Fig. 155.âCarchcsium polyp'nium (after BiitschliV Ixfl, a single animal; right, three stages of dix'ision. cv, (.ontraetile \aeiiole; ;/, maeronucleus; n', niicrtinueleiis; N-i\ food vacuoles; os, c\'lophar\'nx; f^cr, peristome; , reser\-e)ir o{ contractile \'acuole; iiiii, uiiilulatiiig meniliranc; vst, vestibule; â icJ', ring on which a posterior circle of cilia may \'elc)p, ciliated disc which projects free frotii the peristomial area, but in contraction is drawn close against it, the peristome li])s fokling over all. besides, there nniy be a temporary or permanent circle of cilia near the hinder end. The nucleus is usually sausage-shaped, much bent, and with the small micronucleus in its hinder angle (tig. 155, ;;'). The VoRTici'
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
