J. G. WALLER ON PARASITIC VEGETABLE ORGANISMS. 359 



Fig. 4. Fructification of Achlya pertorans. 



Fig. 5. Achlya quadradiata, diam. of tubes 2000th of inch. b. spor- 

 angium at the end of one of the branches. 



Fig. 6. Particle of calcareous sand, showing organism within it (Sapro- 

 legnia Gabbardensis), longest diam. 25th of in. At Fig. 7 por- 

 tion of another. 



Fig. 8. S. Gabbardensis. A single specimen complete ; a the aperture 

 where the excavation began ; length 65th of in. 



Fig. 9. Ditto exhibiting the different modes of fructification. 250 dia- 

 meters. 



Fig. 10. Perithecium of same, long diam. about 3-1000ths of in. ; Fig. 11 

 resting spores (?) removed by decalcification. 



Plate XV. 

 Fig. 1. Retespora Galloperi, diam. 1000th of in. Fig. 2, same developing 



on a thallns. 

 Fig. 3. Saprolegnia Varniensis. Fig. 4, same on reverse side. 

 Fig. 5. Vai neia, containing its protoplasm ; long diam. 100th of in. 



Figs. 7, 8, cavities empty. 

 Fig. 9. Achlya simplex. Tube, diam. 2000th of in. 

 Fig. 10. Excavation, similar to some figures given by Mr. Rose. " See 



Trans. Microscopical Society. 1855, p. 7. 



