PLATE XXVII. 



EXPLANATION. 

 Fig. 



1. UrOTRICHA LAGENULA, Ehr. sp., vol. ii. p. 505, X 3C0. 



2. Urotricha farcta, C. & L., vol. ii. p. 505, x 350 (ClaparMe & Lachmann). 



3, 4. CoLEPS HlRTUS, Ehr., vol. ii. p. 506. — 3, Adult animalcule, x 400 ; 4, example 

 dividing by transverse fission. 



5. COLEPS 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. 50S, X 250 (Perty). 



8-10. POLVKRIKOS 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 trunc.\ta, Cohn, vol. ii. p. 511. — 11 and I2. — Adult examples, x 

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



Enchelys arcuata, C. & L., vol. ii. p. 510, x 300 (Clap. & Lach.). 



Enchelys farcimen, Ehr., vol. ii. p. 510, x 600. 



Anophrys sarcophaga, Cohn, vol. ii. p. 512, x 400 (Cohn). 



Perispira ovum (?) Stein, vol. ii. p. 511. — Dimensions unrecorded (Carter). 



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

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



COLPODA PIGERRIJIA, Cohn, vol. ii. p. 513, X 600 (Cohn). 



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. 51S. — The distal extremity only 

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



29-31. TraCHELOCERCA OLOR, Miiller sp., vol. 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. 5 16, 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 (Engelmann). 



