GANYMEDES ANASPIDIS (nOV. GEN., NOV. SP.). 175 



cavity in the body of the parasite. The cytoplasm contains numerous 

 deeply-staining granules. The nucleus o£ the host-cell (n) is large, 

 darkly-stained, and homogeneous, except for some dark grains. (Iron 

 hsem. X 1340). 



Figs, 11-13. — (Semi-diagrammatic). Cup-ends. 



Fig. 11. — Cup-end of the Gregarine whose ball-end is shown in 



fig. 5 ; (a) is focussed near the upper surface, and shows 



how the cup is separated from the body by a cii'cular 



groove ; (b) shows the greatest diameter ot the cup. (Ii'on 



Hffim. X 1875.) 

 Fig. 12. — Cup-end of another Gregarine, to show absence of 



all differentiation. The ectoplasm is thicker at the end 



than elsewhere. (Paracarm. x 1300.) 

 Fig. 13. — Section of the cup-end of Gregarine a in fig. 9, to 



show the numerous vacuolar spaces beneath the cuticle. 



(M. B. E. x 1300.) 



Figs. 14 and 15. — Sections (5 /*) to show the structui-e of the nucleus 

 in the first trophic phase. (M. B. E. x 1300.) 

 Figs. 16 and 17. — Sections of cysts. 



In fig. 16 the filamentous inward projections fi'om the cyst- wall 

 can be seen. Small chromatic granules fill up the nucleus ; 

 there is no sign of an achromatic network. The nucleoli 

 are retreating to the interior of the nucleus. (Iron Hsem. 

 5 fix 970.) 

 In fig. 17 the nuclei are amoeboid, filled with a homogeneous 

 sap in which are hollow chromatic spherules, apparently 

 emanating from the nucleoli. The cyst-wall is crumpled, 

 and in one place a flaj) of it has got detached so that 

 its surface-structure is seen. (Ehrlich's hsem. + eosin 

 10 fix 800.) 



Fig. 18a. — Section (5 fi) through an associated couple in the second 

 trophic phase. The reticular nature of the cytoplasm is not indicated. 

 (M.B.E. x610.) 



Fig. 186. — The next section in the series. The nucleolus and the 

 outline of the nucleus ai-e given, more highly magnified. The three 

 areas of the nucleolus and their structures are shown (see text). At x 

 a vacuole projects beyond the general surface, and is seen to be colour- 

 less. (M.B.E. X 870.) 



Fig. 19. — Section of a cyst, to show the alteration in staining reactions 

 of nucleus and nucleolus in this stage (see text). (M. B. E. x 400.) 



