Text-book of comparative anatomy . t) divisions. The protomerit often again divides, the anterior division (epi-merit) being furnished \fith hooks, etc., for adhesion ; this part is lost in in deutomerit. Actinoccphalus, Stylorhynchus (, A), Clcpsidriiiii. CLASS V. Infusoria (Ciliata). Unicellular Protozoa, rarely united in .simple colonies,with cilia or cilia-like processes for locomotion and alimenta-tion. Generally with contractile vacuoles, oral and analapertures. With double nucleus : a variously formed large,,nti-ronuc?cus and a small micronucleus (erroneously callednu
Text-book of comparative anatomy . t) divisions. The protomerit often again divides, the anterior division (epi-merit) being furnished \fith hooks, etc., for adhesion ; this part is lost in in deutomerit. Actinoccphalus, Stylorhynchus (, A), Clcpsidriiiii. CLASS V. Infusoria (Ciliata). Unicellular Protozoa, rarely united in .simple colonies,with cilia or cilia-like processes for locomotion and alimenta-tion. Generally with contractile vacuoles, oral and analapertures. With double nucleus : a variously formed large,,nti-ronuc?cus and a small micronucleus (erroneously callednucleolus). Reproduction by fission, conjugation frequent. Order 1. Holotricha. The whole surface is equally covered with fine cilia, oftenarranged in rows. Paramcecium (Fig. 20, p. 17), Trachelius. Order 2. Heterotricha. Possess, besides the clothing of cilia which spreadsequally over the whole surface, a distinctly developed zoneof bristle- or stylet-shaped cilia near the month. Spiro-stomum, Stcntor (Fig. 15), Freia, Order 3. Hypotricha. Dorsal and ventral surfaces sharply distinguished. Ven-tral surface ciliated. Chilodon, Euplotcs, Stylonychia (Fig. 14), Oxytriclia, Urostyla. FIG. 13. —A, Stylo-rhynchus longicollis,after Aime , Epimerit; pm, proto-merit ; dm, , Urospora of individ-uals, after Kdlliker. 10 COMPARA TIVE ANATOMY CHAP.
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