PROTOZOA 



33 



Fam. 4. HALTERIID.E. 



Genera. Strombidium, Cl. & L. (Fig. XXIII. 4) ; Haltena, 

 Dujard., with a sui)plemeutary girdle of springing hairs; Didinium, 

 Stein, (Fig. XXIV. 19). 



Fam. 5. GYROCORID,E. 



Genera. Oyrocoris, Stein, with an equatorial ciliary girdle spirally 

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



FIG. XXIV. Ciliata- 1. Ophaltnopsis sepiolx, Foett. ; a parasitic Holo- 

 trichous mouthless Ciliate from the liver of the Squid, o, nuclei ; &, 

 vacuoles (aon-contractile). 2. A similar specimen treated with picro- 

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

 place of several nuclei. 3. Trichonympha agilii, Leidy ; parasitic 



in the intestine of the Termites (White Ants): x 600. o, nucleus; 6, 

 granules (food?). 4. Opalina raiiarum, Purkinje ; a Holotrichoua 



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

 numerous regularly dispersed nuclei. 5. The same ; an individual in pro- 

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

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

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

 swallowed by Tadpoles. 8. Young iminucleate individual which has 



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

 nuclei and grow to full size before in turn undergoing retrogressive 

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



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

 contractile vacunles. 10. Anoplophrt/a prnlffera, C. and L.jfrom the 



intestine of Clitellio. EemarkaUe fur tlie adhesion in a nietameric series 



of incomplete fission-products, a, nucleus. 11. Amphileptug gigai, 



C. and L. ; one of the Holotricha; x 100. 6, contractile vacuoles ; e, tricho- 

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



nioeus, Ehr.; one of the Holotricha; x 75. a, nucleus; b, contractile 

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

 cuticle of the pharynx isolated. 14. Tracheliut omm, Ehr. (Holo- 



tricha) ; x 80 ; showing the reticulate arrangement of the medullary pro- 

 toplasm, b, contractile vacuoles; c, the cuticle-lined pharynx. 15, 16, 

 17, 18. Icthyophthiriui multi/llius, Fouquet ; one of the Holotricha ; 

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

 o, nucleus ; b, contractile vacuoles. 19. Didinium nas-atum, Mull. ; 



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

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

 pharynx. 20. Euplotei eharon, Mull.; 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 150. 



h, mouth; x, hypotrichous processes (limbs). 22. Kyctotherux cardi- 



formis, Stein ; a Heterotrichous Ciliate parasitic in the intestine of the 

 Frog, a, nucleus ; 6, contractile vacuole ; e, food particle ; d, anus ; e, 

 heterotrichous band of large cilia ; /, <j, mouth ; A, pharnyx ; i, small cilia. 



Fam. 6. URCF.OLARIID.E. 



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

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

 ring (Fig. XXIII. 8, 9); Limophora, Clap.; Cvdochxta, Hat. Jacks. 



f 



'** 



8 . pit 9 P nS 10 



-prf 



' N ]f JV 



pn /v v x />n>?> ^-kpn* 



N 



e 



W 



pn-*r^j_ 



pn+ M ^ 



- -** v *^ 



-rrfv 



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

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







