EXPLANATION OF PLATE VI. 



FIG. 



1-6. SALPINGCECA INQUILLATA, S. K. i, Zooid in its normal and fully extended 

 state, x 1250; 2-5, showing various phases accompanying the process of 

 transverse fission ; 6, a recently attached collarless zooid commencing to 

 excrete its protective lorica. 



7. SALPINGCECA LONGIPES, S. K. Two zooids, x 1250. 



8-16. SALPINGCECA INFUSIONUM, S. K. 8, Normal adult zooid, x 800 ; 9, zooid 

 dividing by transverse fission ; 10, distal separated half of the same zooid 

 presenting the form of a simple uniflagellate monad ; u, the same monadi- 

 form zooid attached by its posterior extremity, and having already developed 

 a short pedicle ; 1 2 and 1 3, further progressive phases, showing in the latter 

 instance the zooid fully developed, but as yet wanting a lorica; 14, the same 

 zooid, with collar and flagellum retracted, secreting its lorica; 15 and 16, 

 sporocyst and liberated monadiform germ of the same species. 



17-19. SALPINGCECA CLARKII, Stein (after Stein). 17, A social colony attached to the 

 anterior extremity of a Rotifer (Philodina htrsuta), x 650; 18 and 19, 

 larger examples obtained from the roots of duckweed, the zooid in the latter 

 instance with collar and flagella retracted and assuming an amceboid 

 phase, x 650. 



20-23. SALPINGCECA OBLONGA, Stein (after Stein). 20 and 21, Normal zooids, x 650; 

 22, exhibiting an apparent conjugative process between a normal sedentary 

 and a naked free-swimming zooid ; 23, an encysted zooid. 



24. SALPINGCECA VAGINICOLA, Stein. Apparently an intermediate variety of 

 S.gracilis, J.-Clk. (after Stein), x 650. 



25-32. SALPINGCECA GRACILIS, J.-Clk. 25, Early condition of short-stalked variety 

 (after Stein) ; 26 and 27, adult long-stalked varieties, x 1250 ; 28, zooid 

 dividing by transverse fission within posteriorly pointed but non-pedi- 

 cellate lorica ; 29, another phase of transverse fission, the original collar and 

 flagellum being retracted ; 30, anterior half of the same zooid liberated as 

 a free-swimming monadiform germ; 31, a zooid encysted within its lorica, 

 and marked by a transverse divisional line ; 32, a cluster of zooids having 

 sessile and posteriorly rounded loricas, X 1250. 



33-36. SALPINGCECA CORNUTUM, S. K. 33, Normal adult form, the zooid adherent to 

 the side of its lorica by several pseudopodic posterior processes, x 1000 ; 

 34, an abnormal variety, in which the second zooid derived by fission has 

 remained closely associated with the parent one, and produced a pseudo- 

 compound lorica; 35, an isolated zooid, having an attenuate vermicular 

 contour ; 36, a zooid attached to the wall of its lorica by a simple pedicle- 

 like posterior prolongation. 

 SALPINGCECA CYLINDRICA, S. K., x 2000. 

 SALPINGCECA TUBA, S. K. A social colony, x 1500. 



SALPINGCECA CARTERI, S. K. Monad with so-called " ear - like points," as 

 originally figured and described by Mr. Carter, x 1500. 



