INFUSORIA. 839 



vibratile setae ; a set of adoral membranellae, disposed in a straight or curved line, 

 in the latter case surrounding a peristomial area : Bursaria, Balantidium, Stentor; 

 Tintinnodea, &C. 1 



3. Peritricha : free or fixed ; solitary or colonial ; naked or tubicolous ; with 

 an adoral spiral of membranellae, or one or more ciliary girdles ; otherwise destitute 

 of cilia: see note 2 p. 832 : Torquatella ; Halteria ; Didinium ; Trichodina, &c. ; 

 Vorticellina, e. g. Vorticella, Epistylis, Carchesium, Spirochona ; Vaginicolina, e. g. 

 Vaginicola, Cothurnia ; Ophrydina, e.g. Ophrydium. 



4. Hypotricha : free, rarely tubicolous ; with one surface, the ventral, flat, the 

 other, the dorsal, more or less convex ; ventral surface either entirely ciliate or with 

 compound cilia disposed in special groups or lines ; dorsal surface sometimes pro- 

 vided with immobile setae ; adoral membranellae usually present ; a complex peri- 

 stome in two families (Oxytrichidae, Euplojidae) : Chilodon, Loxodes, Dysteria, &c. ; 

 Stichotricha, Schizosiphon, Oxytricha, Stylonychia, &c. ; Euplotes, &c. 



Manual of the Infusoria, Saville Kent, ii. 1881-82 (with lit.); Organismus 

 der Infusions-thiere, Stein, Leipzig, i. Hypotricha, 1859; ii. Heterotricha, 1867; 

 Etudes sur les Infusoires, &c., Claparede and Lachmann, 2 vols., Geneva, 1858-61 

 (Mem. Inst. Nat. Genevois, v. vi. vii). 



*Protozoen des Hafens von Genua, Gruber, Nova Acta, 46, 1884, p. 509 et 

 seqq. ; *Infusorien des Golfes von Neapel, Ge'za Entz, Mitth. Zool. Stat. Naples, v. 

 1884; *Ein kleines Beitrag. &c., von Daday, ibid. vi. 1886; Contributions a 

 Pe'tude morphol. et anat. des Infusoriens cilie*s, Maupas, A. Z. Expt. (2), i. 1883 : 

 *Protozoaires des Vieux-Port de Marseille, Gourret, A. Z. Expt. (2), iv. 1886; Neue 

 Infusorien, Schizosiphon (= Stichotricha) socialis, Maryna, &c., Gruber, Z. W. Z. 

 xxxiii. i878 2 . 



Holotricha. Coleps hirtus, Maupas, A. Z. Expt. (2), iii. 1885: C. fusus = 

 Tiarina, Bergh, see Naples Zool. Jahresbericht, 1880, Protozoa, p. 170; Opalina, 

 (various species), Zeller, Z. W. Z. xxix. 1877 ; Anoplophrya circulans, Schneider, 

 Tablettes Zoologiques, Poictiers, i. 1886 ; Balbiani, Recueil Zool. Suisse, ii. 1885 ; 

 Benedenia, Opalinopsis, Foettinger, Archives de Biologic, ii. 1881 ; Infusorian para- 

 sites of Termites, Leidy, Journal Acad. Nat. Sc. Philadelphia, (2), viii. 1881 ; 

 Ichthyophthirius, Fouquet, A. Z. Expt. v. 1876. 



Heterotricha. Bursaria truncatella, Brauer, J. Z. xix. 1885, Schubergh, M. J. 

 xii. 1886; Folliculina (= Freja] ampulla, Moebius, A. N. H. (5), xvi. 1885 ; Tin- 

 tinnidium fluviatile, Codonella lacustris, Ge'za Entz, Mitth. Zool. Stat. Naples, vi. 

 1886 (with lit. on family, p. 214). 



Peritricha. Actinobolus radians, Mesodinium acarus, and on limits of order, 

 'Beitrage,' &c., Ge'za Entz, Z. W. Z. xxxviii. 1883; Didinium, Balbiani, A. Z. Expt. 

 ii. 1873; Trichodina, Rosseter, Journal Roy. Micr. Soc. (2), vi. 1886; Epistylis, 

 Ophrydium, &c., ' Beitrage,' Wrze'sniowski, Z. W. Z. xxix. 1877 : Vorticella nebuli- 

 fera, Everts, Z. W. Z. xxiii. 1873; Vorticellidae, Greeff, A. N. 36, (i), 1871; 



1 By Saville Kent the Tintinnodea are divided between the Heterotricha and Peritricha ; they 

 appear to be entirely Heterotrichan. The Urceolarine Trichodinopsis he classifies similarly with 

 the Heterotricha on account of its general ciliation ; it is better to consider it as an aberrant 

 Peritrichan. See references quoted, note 2, p. 832, ante. 



a The asterisks mean that Acinetarians are included in the papers. 



