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Volume 78, 1950
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Explanation of Plates 37, 38, and 39

Fig. 1—Loxophyllum meleagris, a fully extended specimen, from the right side.

Fig. 2—Colpidium colpoda, live specimens. (a) From the right side; the course of the ciliary meridians is indicated. Note the antero-ventral swing in the course of the meridians. (b) From the left side, showing the frontal suture.

Fig. 3—Colpidium colpoda, fixed and stained specimen showing the ciliary meridians as seen from the ventral aspect. Note that the right-hand meridians swing on to the left side to form the pre-oral suture (PR.S.) where they meet the longitudinal meridians of the left side.

Fig. 4—Urocentrum turbo. (a) Live specimen from ventral aspect. (b) Posterior view of specimen.

Fig. 5—Urocentrum turbo, fixed and stained specimens. (a) Individual with three macronuclei. (b) Individual with two macronuclei.

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Fig. 6—Cyrtolophosis mucicola, live specimen, within mucilaginous envelope.

Fig. 7—Spirostomum ambiguum var. major, live specimen from the right side.

Fig. 8—Halteria grandinella, live specimen from the ventral aspect.

Fig. 9—Stylonychia notophora, live specimen from the ventral aspect. One micronucleus is lying beside each macronuclear body.

Fig. 10—Stylonychia putrina, live specimen from the ventral aspect.

Fig. 11—Aspidisca turrita, live specimen from the ventral aspect.

Fig. 12—Aspidisca turrita, lateral view to show dorsal spine. Free-hand diagram.

Fig. 13—Aspidisca lynceus, live specimen from the ventral aspect.

Fig. 14—Vorticella nebulifera var. similis, fully extended live specimen from the left side. The number of the oesophageal fibres has not been determined accurately in this, or other vorticellids in this paper.

Fig. 15—Vorticella nebulifera var. similis, the stalk, showing the spasmoneme and theeoplasmic granules.

Fig. 16—Vorticella microstoma, fully extended live specimen from the left side.

Fig. 17—Vorticella microstoma, posterior extremity and stalk.

Fig. 18—Vorticella microstoma, an encysted specimen.

Fig. 19—Vorticella brevistyla, fully extended live specimen from ventral aspect.

Fig. 20—Vorticella brevistyla, the stalk, showing the spasmoneme and thecoplasmic granules.

Fig. 21—Vorticella brevistyla, fixed and stained individual. The teat-like protrusion on the anterior extremity of contracted forms is barely perceptible in this specimen.

Note.—All figures have been drawn with the aid of a camera lucida. Micronuclei are shown when their size or position permit.

Abbreviations.—C.C., collecting canal; C.M., outer cytostomal membrane; C.V., contractile vacuole; CY., cytostome; CYT., cytopharynx; F., endoral fibrils; F.V., food vacuole; L., posterior lappet; M, 1–3, cytopharyngeal membranes; MAC, 1–3, macronucleus (macronuclei); MIC., micronucleus; MY., myoneme; O.F., oesophageal fibres; PR.S., pre-oral suture; T., tail; V., vestibule; V.G., ventral groove; V.M., vibratile membrane.

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