. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. PROTOZOA:INFUSORIA 75 ing of a number of calyces supported upon a branched pedicle, but differs from Epistylis and agrees with Vorticella in the fact that the pedicle is contractile. Stentor, or the trumpet-animalcule (fig. ii, U), is another common Infusorian which is closely related to Vorticella. It. Fig. II.—a Vaginicola crystallina; b Stentor MuUeri; c Group of Vorticella-i d Detached bud of Vorticella^ showing the posterior circlet of cilia, consists of a trumpet-shaped cal
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. PROTOZOA:INFUSORIA 75 ing of a number of calyces supported upon a branched pedicle, but differs from Epistylis and agrees with Vorticella in the fact that the pedicle is contractile. Stentor, or the trumpet-animalcule (fig. ii, U), is another common Infusorian which is closely related to Vorticella. It. Fig. II.—a Vaginicola crystallina; b Stentor MuUeri; c Group of Vorticella-i d Detached bud of Vorticella^ showing the posterior circlet of cilia, consists of a trumpet-shaped calyx, devoid of a pedicle, but possessing the power of attaching and detaching itself at will. When detached it swims by means of the anterior circlet of cilia, just as the calyx of Vorticella will, if broken from its stalk. In Vaginicola (fig. ii, a) the essential structure is much the same as in Vorticella, but the body is protected by a membranous or homy case (" carapace" or " lorica"), within which the animal can retire. In this beautiful Infu- sorian the carapace is certainly a cuticular secretien, but it appears at the same time to be quite distinct from the true cuticle itself Amongst the structures of the Infusoria which require some notice are the "pigment spot" and the "; The pigment spot is a brightly-coloured solid particle, generally red, of very common occurrence in many Infusoria, but of quite unknown function. The " trichocysts" are vesicular bodies, capable of emitting thread-like filaments, and greatly resembling the urticating cells of many of the Cxlenterata. They have been detected in Bursaria, as well as in various other members of this order; and they are very like certain cells which are found in the integument of many Planarians. II. Order Suctoria.—This order includes a series of In- fusoria of a very anomalous nature. In Acineta, which may be taken as the type, the body is covered with a
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