SOO W. ARCHER. 



ordinary A. sol. It was in the form alluded to that I noticed 

 the evolution of zoospores as recorded in the minutes of the 

 Dublin Microscopical Club.^ These were in length -3-3^", 

 in breadth voVo"") pyriform, bearing two flagella of different 

 lengths at the pointed end, the longer about as long or one 

 and a half times as longas the body, which showed no " eye- 

 speck" and sometimes contained one of the chlorophyll- 

 granules. They seemed to be given off directly from the 

 body-substance ; as to their fate I regret I know nothing. 



Ciliophrys infusionum, Cienkowski (fig. 1), 



Is the name given by the author^ to a Heliozoan 

 found in long-standing infusions and amongst colourless 

 Oscillatorise, Leptophrix-forms, »&;c., seeming to present 

 no very strong " structural " generic character to sepa- 

 rate it from Actinophrys. It has the habit of -4. sol, but 

 it is considerably smaller. In the regular distribution of 

 the granuliferous pseudopodia, in the possession of a central 

 nucleus with nucleolus, in the often occurring vacuolar 

 (frothy) consistence of the protoplasm, especially at the 

 periphery, and in the mode of inception of foreign bodies, 

 both forms coincide. The only distinction, apart from size, 

 relates to the contractile vacuoles. In A. sol these are 

 large during the diastole, very considerably and prominently 

 projecting — contracting in a wrinkled manner during the 

 systole. The present form possesses one to three very small 

 contractile vacuoles (which judging from the figure, do not 

 seem to " wrinkle "). 



Now, I myself would be much disposed, were it not for 

 the circumstance noted below, here to adduce the present as 

 a case in point of the establishment of at least one genus 

 too many. The organism seems so far as " body-structure," 

 taken as a whole, is concerned, to be to all intents and pur- 

 poses, an Actinophrys. The author himself, indeed, admits 

 that the establishment of a new genus and species therefore 

 is, at best, but arbitrary. 



The author regards the present form as the only one of 

 naked Heliozoa known to produce zoospores. It may, how- 

 ever, call to mind my own cursory observations^ on a large 

 chlorophyll-bearing form of A. sol (such it must be con- 

 sidered at least for the present) in which Zoospores were 

 given off one by one from the living (unencysted) organism. 



' ' Quart. Journ. Micr. Sci.,' vol. x, New Sen, p. 306, 

 * Schultze's ' Archiv. fiir Mikrosk. Anat.,' Bd. xii, p. 29, t. v, figs. 26 

 ^43. 

 » ' Quart. Journ. Microsc. Science/ vol. x, p. 3Q6. 



