98 OBSERVATIONS ON THE CONJUGATION OF ACTINOPHRYS SOL. 



frequently seen to whisk out of the field with a rapidity like light- 

 ning, in this case using the processes as motive organs. I think I 

 have also noticed this fact in one of a bright green colour, found at 

 Hampstead, as well also in one of a grey tint found in the same 

 locality. These have no contractile vesicle that I have seen ; they 

 are not found in abundance as far as my experience goes, and their 

 being classed with the Actinophrys Sol may be due only to their 

 resemblance in shape. My belief is they are larval forms of other 

 creatures. 



Among my drawings of the 8th May, 1861, from the same 

 gathering, was one very small object, white and transparent in 

 substance, with tentacular processes like the actinophrys, of which 

 it may have been an early stage. I exhibit a drawing of it, bear- 

 ing its relative size to the other forms (Fig. 17). I have brought 

 forward this subject now for two reasons — first, because this is the 

 time of the year to pursue this investigation for those who may be 

 interested in it ; secondly, because I do not wish to be quite an 

 idle member of the Club. 



Plate X. Illustrates this Paper % 

 EXPLANATION OF PLATES, 



ILLUSTRATING MR. F. KITTON's PATER. 



Plate II. 



Figs. 1 and 6, Trinacria Eegina, side view; 2, outline of base (grund fladen) j 

 3, outline of base (side view) ; 4, side view of frustule ; 5 and 7, side views of 

 valve. 



Plate ILL 



Fig. 1, Corinna elegans, front view of frustules in series ; 2 and 3, front view 

 of valve ; 4, transverse section of valve ; 5, transverse side view of valve. 

 6 and 7, Trinacria excavata, side view of valve ; 8, front view of valve ; 9, front 

 view of frustules in series. 10 and 15, Solium exsculptum, side views of valves ; 

 11 and 13, front views of valves ; 12, front views of frustules in series; 14, side 

 view of valve, inner surface. 



Plate XI. 



Fig. 1, Hemiaulus Proteus, front view; 2, side view of valve, inner surface 

 (grund fladen) ; 3, side view outer surface (Hoved fladen) ; 4, valve as seen edge- 

 wise (Iva^rsmittet) ; 5, front view of large valve ; 6, front view of small valve, 

 7, Hemiaulus liostilis, front view; 8, front view of two opposite valves (small) ; 

 9, side view of valve, inner surface ; 10, side view of valve, outer surface ; 11, 

 valve as seen edgewise. 12, Hemiaulus februatus, front view ; 13, front view 

 small valve; 14, side view, inner surface; 15, side view, outer surface; 16, valve 

 as seen edgewise. 



