in Eudorina elegaus and Cryptoglena. 253 



a, cells ; b, gelatinous envelope ; c, canal through the latter for 

 the passage of the cilia. 



The third stage, in which Eudorina is 50-5400ths of an inch 

 long, has not been represented, as the reader can supph' this for 

 himself by increasing the second stage to the length mentioned, 

 and substituting for each of the cells in this stage a group like 

 that of fig. 1, but a little smaller; the cells smaller, and the 

 shape of the group more or less oblong. 



Fiff. 9. Chlamydococcus ? in the " active" state ; largest size 5-5400ths 



of an inch in diameter : a, nucleus ; b, eye-spot ; e, contracting 

 vesicle. 



Fig. 10. Ditto, in the two-division. 11. The same with the cells ovate 

 and the cilia of the mother- cell remaining. This resembles 

 Ehrenberg's figure of Ch. Pulrisculus. 



Figs. 12, 13. Ditto, in four- and eight-division respectively. 



Fig. 14. Ditto, in eight-division, with the cells undergoing further divi- 

 sion successively up to the sixteen-division. 



Fig. 15. Ditto, " still" form, largest size 5-5-iOOths of an inch in diameter, 

 without eye-spot or cilia : a, cell-wall. 



Figs. Ifi, 1/. Ditto, ditto, in four- and sixteen-division respectively. Ob- 

 ser\'e that the mother-cell here is not distended into a spherical 

 shape, as in the active form, but contracted round the cells, so 

 as to give the whole a mulberry character : a, a, mother-cell- 

 wall. 



All the varieties of division which take place in the " active " 

 also take place in the '"'still" form, and vice versa. 



Fig. 18. Cryptogleiia lenticiilaris, nov. sp., vertical view, 4-5400ths of an 

 inch in diameter : a, lorica ; b, internal cell ; e, nucleus ; d, eye- 

 sjjot ; e, contracting vesicle. 



Fig. V.K Ditto, horizontal view. 



figs. 20, 21. Ditto, in two- and four-division within the lorica. 



Fig. 22. Ditto, in four-division, with the split lorica still adhering to the 

 internal cell, which is 8-5400ths of an inch in diameter. 



Fig. 23. Ditto, in eight-division ; internal cell 6-5400ths of an inch in 

 diameter. 



Both these figures are undistinguishable from the correspond- 

 ing forms of Chlamydococcus in the "active" state. 



Fig. 24. Ditto, in the sixty-two- or spermatic division, 4-5400ths of an 

 inch in diameter. 



Fig. 25. Ditto, with the lorica effete, and adhering to the internal cell, 

 which contains a number of active spermatozoids, some of which 

 are issuing from a ruptured opening in the cell-wall. 



Fig. 26. Ditto, ditto, with the inner cell containing two macrogonidia or 

 female cells, and surrounded by active spermatozoids, one of 

 which has passed into it and is adhering to one of the macro- 

 gonidia. Macrogonidium about 3-5400ths of an inch, and micro- 

 gonidium or spermatozoid about half 1 -5400th of an inch in 

 diameter. 



Fig. 27. Ditto, ditto, ditto, with the internal cell divided into two, and 

 thus affording a separate cell for each gonidium. 



Fig. 28. Cryptoglena cordiformis, nov. sp., in the " active" state. Suji- 

 posed impregnated spore of C. lenticularis. 



Fig. 29. Ditto, after transformation into a resting-spore. 



Ann. ^ Mac;. N. Hist. Ser. 3. Vol. ii. 18 



