EXPLANATION OF PLATE VL 



Fig. 



1-6. Salpingceca inquillata, S. K., vol. i. p. 354. — 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 com- 

 mencing to excrete its protective lorica. 

 7. Salpingceca longip-es, S. K., vol. i. p. 353.— Two zooids, x 1250. 



8-16. Salpingceca infusionum, S. K., vol. i. p. 356. — 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 ; 11, the same 

 monadiform zooid attached by its posterior extremity, and having already 

 developed a short pedicle ; 12 and 13, 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), vol. i. p. 358. — 17, A social colony 

 attached to the anterior extremity of a Rotifer {Philodina Imsutd), 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 

 amoeboid phase, x 650. 



20-23. Salpingceca oblonga, Stein (after Stein), vol. i. p. 358. — 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, vol. i. p. 352. — Apparently an intermediate 

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



25-32. Salpingceca gracilis, J.-Clk., vol. i. p. 351. — 25, Early condition of short- 

 stalked variety (after Stein) ; 26 and 27, adult long-stalked varieties, 

 X 1 250 ; 28, zooid dividing by transverse fission within posteriorly pointed 

 but non-pedicellate 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 lorica^, x 1250. 



33-36. Salpingceca cornuta, S. K., vol. i. p. 350. — 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 vermi- 

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

 pedicle-like posterior prolongation. 



37. Salpingceca cylindrica, S. K., vol. i. p. 348, x 2000. 



38. Salpingceca tuba, S. K., vol. i. p. 351. — A social colony, x 1500. 



39. Salpingceca Carteri, S. K., vol. i. p. 348. — Monad with so-called " ear-like 



points," as originally figured and described by Mr. Carter, x 1 500. 



