. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CILIATES OF THE FAMILY ANC1STROCOMIDAE. IV 203 straight or weakly indented. The body is widest at the middle or a short distance anterior to the middle. The ciliary system is disposed on a shallow concavity oc- cupying the anterior two-thirds of the ventral surface; the dorsal surface and that part of the ventral surface posterior to the ciliary area are convex. Twenty-five living specimens taken at random ranged in length from 36 /j. to 48 /JL, in width from 15,u, to 20 fj., and in thickness from 11/A to 14 /JL, averaging a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CILIATES OF THE FAMILY ANC1STROCOMIDAE. IV 203 straight or weakly indented. The body is widest at the middle or a short distance anterior to the middle. The ciliary system is disposed on a shallow concavity oc- cupying the anterior two-thirds of the ventral surface; the dorsal surface and that part of the ventral surface posterior to the ciliary area are convex. Twenty-five living specimens taken at random ranged in length from 36 /j. to 48 /JL, in width from 15,u, to 20 fj., and in thickness from 11/A to 14 /JL, averaging about 43/x by 18/A by 13 fjL. The anterior end is provided with a contractile suctorial tentacle continuous with an internal tubular canal. The nature of the canal is very similar to that of other members of the genus. It is directed at first dorsally and then ventrally and ob- liquely toward the right side of the body. It can be traced in most fixed specimens stained with iron hematoxylin for about one-half to two-thirds of the length of the FIGURE 2. Hetcrocineta goniobasidis sp. nov. Distribution of ciliary rows, somewhat diagrammatic. Ventral aspect. The cilia of H. goniobasidis are about 9 /A long. Those of the anterior part of the ciliary system are markedly thigmotactic. The ciliary system consists of ten longitudinal rows. The first six rows are approximately the same length, being about one-half the length of the body, although on careful examination the first row is seen to originate some distance posterior to the level of origin of the other five rows. The seventh, eighth, ninth, and tenth rows originate progressively more posteriorly and become increasingly longer, terminating one behind the other a little to the left of the midline. The longest row is two-thirds to three-fourths the length of the body. The last one or two rows usually originate on the left margin and curve ventrally as they extend backward. The cilia of the distal portions of the longer rows
Size: 1027px × 2434px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
