42 



SYSTEMATIC ZOOLOGY 



P.J 9o\ ^ * 



.■ 



Monosiga. 2.Salpingoeca. 3.Polyoeca. 4-.Prorerospo.ngia. 



Fig. 23. Various Choanoflagellata. r, collar; ^.wzr, contractile vacuole; Jl, flagellum ; 

 /, lorica or chitinous shell; nu, nucleus; s, stalk. 2b, longitudinal division; 2c, spore 

 formation. (After Kent, from Parker and Haswell's Manual.) 



FIG. 24. Codosigna cymosa, a branching colony of Choanoflagellata. (After Kent, from 



Calkins' Protozoa.) 



