PROTOZOA 



33 



Fam. i. HALTERIIDiE. 



Genera. — StromUdium, CI. & L. (Fig. XXIII. 4) ; Halteria, 

 Dujard., with a supplementary girdle of springing hairs ; Didinmm, 

 Stein, (Fig. XXIV. 19). 



Fam. 5. Gyrooorid^. 



Genera. — Gyrocoris, Stein, with an equatorial ciliary girdle spirally 

 disposed (Fig. XXIII. 23, 24); Urocentrwm, Nitzsch, girdle annular. 



Fta. XXIV. Ciliata-— 1. Ophaltnopsis lepiolie, Foett. ; a parasitic Holo- 

 trichous mouthless Ciliate from tlie liver of tlie Squid, a, nuclei; 6, 

 vacuoles (non-contractile). 2. A similar specimen treated with pioro- 



carmlne, showing a remarkably branched and twisted nucleus; a, in 

 place of several nuclei. 3. Trwhonympha agilis, Leidy ; parasitic 



in the intestine of the Termites (White Ants); x 600. a, nucleus; b, 

 granules (food?). i. Opalina, ranarum, Purkinje; a Holotrichous 



mouthless Ciliate parasitic in the Frog's rectum ; adult ; x 100. a, a, the 



- numerous regularly dispersed nuclei. 6. Tlie same ; an mdmdual m pro- 

 cess of binary fission, o, nuclei. 6. The same; the process of fission has 

 now reduced the individuals to a relatively small size. 7. Smallest flssmn- 

 produced fragment encysted, expelled from the Frog m this state and 

 swallowed by Tadpoles. 8. Young uninucleate individual which has 



emerged from the cyst within the Tadpole, and will now multiply its 

 nuclei and grow to fuU size before in turn undergoing retrogressive 

 fission. 9. Anoplophrya naidos, Duj. ; a mouthless Holotrichous 



Ciliate parasitic in the worm Nais; x 200. a, the large axial nucleus; 6, 

 contractile vacuoles. 10. Anoplophrya prolifera, C. and L. ; from the 



intestine of ClitelUo. Kemarkable for the adhesion in a metameric series 



of incomplete fission-products, a, nucleus, 11. Amphihptui gigas, 



C. andL. ; oneof theHolotricha; x 100. &, contractile vacuoles ; c, tricho- 

 cysts (see Fig XXIII. 19) ; d, nucleus ; e, pharynx. 12, 13. Prondan 



niveus, Ehr.; one of the Holotricba; x 76. a, nucleus; b, contractile 

 vacuole; c, pharynx with horny fascicular lining. 12. The fasciculate 

 cuticle of the pharynx isolated. 14. Trachelius ovum, Ehr. (Holo- 



triolia) ; X 80 ; showing the reticulate arrangement of the medullary pro- 

 toplasm, b, contractile vacuoles; c, the cuticle-lined pharynx. 16, 16, 

 17, 18. Icthyophthirius multifllius, Fouquet ; one of the Holotricha ; 

 X 120. Free individual and successive stages of division to form spores. 

 a, nucleus ; 6, contractile vacuoles. 19. Didinium nas-utum, MilU. ; 



one of the Feritricha ; x 200. The pharynx is everted and has seized a 

 Paramcecium as food, a, nucleus ; 6, contractile vacuole ; c, everted 

 pharynx. 20. Euplotes charon, Miill.; one of the Hypotricha ; lateral 



view of the animal when using its great hypotrichous processes, x, as 

 ambulatory organs. 21. Euplotes harpa, Stein (Hypotricha); x 160. 



A, mouth; x, hypotrichous processes (limbs). 22. Nyctotherus cordi- 



formiSj Stein ; a Heterotrichous Ciliate parasitic in the intestine of the 

 Frog, a, nucleus ; b, contractile vacuole ; c, food particle ; d, anus ; e, 

 heterotrichous band of large cilia ; /, </, mouth ; h, phamyx ; i, small cilia. 



Fam. 6. IJRCEOLARijbiB. 



Genera. — Trichodina, Ehr, ; two ciliate girdles ; body shaped as a 

 pyramid with circular suoker-like base, on which is a toothed corneous 

 ring (Fig. XXIII. 8, 9); Zicnophora, Clap.; Gvclochxta, Hat. Jacka, 



Fio. XXV, Ciliata (conjugation, Ac), 1. Surface view of Holotrichous 

 CUiate, showing the disposition of the cilia in longitudinal rows, 2. 



