PLATE XXXI. 



EXPLANATION. 

 FIG. 



1,2. TINTINNUS EHRENBERGII, C. & L., extended and contracted states, x 150 

 (Claparede & Lachmann). 



3. TINTINNUS URNULA, C. & L., x 150. Atpr, a second peristome in process of 



development (Clap. & Lach.). 



4. TINTINNUS Ussowi, Meresch., empty lorica, x 400 (Mereschkowsky). 



5. TINTINNUS SUBULATUS, Ehr., x 250 (Ehrenberg). 



6, 7. TINTINNIDIUM SEMICILIATUS, Sterki sp. At 7 an animalcule isolated from its 

 lorica, viewed in optical section, and showing at m outer wreath of furcately 

 branched cirrose cilia or membranellas, and at i inner circlet of ordinary 

 vibratile cilia, x 200 (Sterki). 



8. TINTINNIDIUM FLUVIATILIS, Stein sp., x 200. 



9. TINTINNIDIUM MARINUM S. K., x 200 (Ehrenberg). 



10. TINTINNUS CINCTUS, C. & L., empty lorica, x 250 (Clap. & Lach.). 



11. TINTINNUS CAMPANULA, Ehr., x 150. At/r, a second peristome is in course of 



development, x 150 (Clap. & Lach.). 



12. TINTINNUS AMPHORA, C.& L., x 150 (Clap. & Lach.). 



13. TINTINNUS QUADRILINEATUS, C. & L., empty lorica, x 150 (Clap. & Lach.). 



14. TINTINNUS ACUMINATUS, C. & L., empty lorica, x 200 (Clap. & Lach.), 



15. TINTINNUS INQUILINUS, Ehr., x 300 (Clap. & Lach.). 



1 6. TINTINNUS MUCICOLA, C. & L., x 150 (Clap. & Lach.). 



17. TINTINNUS sp. Empty lorica, x 250 (Clap, and Lach.). 



18, 19. TINTINNUS DENTICULATUS, Ehr. 18, Empty lorica, x 150; 19, portion of the 



same, x 800 (Clap. & Lach.). 



20. TINTINNUS STEENSTRUPII, C. & L., x 200 (Clap. & Lach.). 

 21,22. TINTINNUS LAGENULA, C. & L. 21, normal example, x 300; 22, lorica con- 

 taining two zooids (Clap. & Lach.). 



23. TINTINNUS sp., C. & L., x 150 (Clap. & Lach.). 



24. TINTINNUS HELIX, C. & L., empty lorica, x 150 (Clap. & Lach.). 



25. TINTINNUS ANNULATUS, C. & L., empty lorica, x 150 (Clap. & Lach.). 



26. TINTINNUS OBLIQUUS, C. & L., x 300 (Clap. & Lach.). 



