PLATE XXVII. 



EXPLANATION. 

 FIG. 



1. UROTRICHA LAGENULA, Ehr. sp., vol. ii. p. 505, x 300. 



2. UROTRICHA FARCTA, C. & L., vol. ii. p. 505, x 350 (Claparede & Lachmann). 



3, 4. COLEPS HIRTUS, Ehr., vol. ii. p. 506. 3, Adult animalcule, x 400 ; 4, example 

 dividing by transverse fission. 



5. CQLEPS FUSUS, C. & L., vol. ii. p. 507, x 350 (Clap. & Lach.). 



6. COLEPS UNCINATUS, C. & L., vol. ii. p. 507, x 350 (Clap. & Lach.). 



7. PLAGIOPOGON COLEPS, Ehr. sp., vol. ii. p. 508, x 250 (Perty). 



8-10. POLYKRIKOS SCHWARTZII, Biitschli, vol. ii. p. 508. 8, Adult example, x 200 ; 

 9 and 10, supposed trichocysts with thread-like filament in the retracted and 

 extended states, x 600 (Biitschli). 



11-13. METACYSTIS TRUNCATA, Cohn, vol. ii. p. 511. ii and 12. Adult examples, x 

 400 ; young zooids as yet devoid of transverse annulation (Cohn). 



14. ENCHELYS ARCUATA, C. & L., vol. ii. p. 5 10, x 300 (Clap. & Lach.). 



15. ENCHELYS FARCIMEN, Ehr., voL ii. p. 510, x 600. 



1 6, 17. ANOPHRYS SARCOPHAGA, Cohn, vol. ii. p. 512, x 400 (Cohn). 



18. PERISPIRA OVUM (?) Stein, vol. ii. p. 511. Dimensions unrecorded (Carter). 



19-23. COLPODA CUCULLUS, Ehr., vol. ii. p. 512. 19, Adult animalcule, x 200; 20-23, 

 mucous phases of encystment and sporular mode of multiplication (Stein). 



24. COLPODA PIGERRIMA, Cohn, vol. ii. p. 513, x 600 (Cohn). 



25-27. LACRYMARIA COHNII, S. K., voL ii. p. 518. At 25 example with the body 

 contorted into a screw-like form, x 250 ; at 27 an animalcule spherically 

 contracted (Cohn). 



28. LACRYMARIA CORONATA, C. & L., vol. ii. p. 518. The distal extremity only 

 showing the double ciliary wreath, x 350 (Clap. & Lach.). 



29-31. TRACHELOCERCA OLOR, Miiller sp., yol. ii. p. 515. 29 and 31, Adult animalcules, 

 x 300; 30, distal extremity more highly magnified, displaying oral 

 structure. 



32. TRACHELOCERCA PHCENICOPTERUS, Cohn, vol. ii. p. 516, x 300 (Cohn). 



33. TRACHELOCERCA VERSATILIS, Mull, sp., vol. ii. p. 516, x 200. 



34. LACRYMARIA LAGENULA, C. & L., vol. ii. p. 517, x 350 (Clap. & Lach.). 



35. LAGYNUS ELEGANS, Eng. sp., vol. ii. p. 521, x 300 (Engehrunn). 



