in Eudorina elegans and Cryptoglena. 247 



lopment of Eudorina during the past four years, I have thus 

 only once met with it under fecundation. 



As regards the effect of iodine (both by itself and assisted 

 by sulphuric acid) upon Eudorina, I could never obtain a blue 

 colour in the cells at any time ; but it was distinctly visible in 

 the transparent structures between them, perhaps in their cap- 

 sules and the cellulose material which supported the rest of the 

 organism. The contents of the cells always assumed a brown 

 colour. The same was the case with the Chlamydococcus, though 

 I see by my sketches that the solitary dividing still- cell, in the 

 autumn of 1855, became blue throughout under the action of 

 iodine and sulphuric acid. 



Since the above was written, I have had the good fortune to 

 meet with a Cryptoglena undergoing fecundation, of which the 

 following is a description, both of the organism and the pro- 

 cess : — 



Cryptoglena lenticularis, nov. sp. PL VIII. figs. 18, 19. 



Lorica lenticular, compressed, emarginate, uniformly and mi- 

 nutely granulated, transparent, colourless by transmitted, 

 brownish by reflected light; margin of a deeper colour than 

 the rest, probably from the proximity of the sides ; presenting 

 on the edge a notch anteriorly, one lip of which projects be- 

 yond and slightly overlaps the other, from which it is sepa- 

 rated by an oblique fissure. Internal cell lenticular, com- 

 pressed, one-fourth less in diameter than the lorica, lined 

 with green chlorophyll and granular protoplasm, provided 

 with a pair of cilia which pass out at the notch in the margin 

 of the lorica, a single contracting vesicle at their base, a red 

 eye-spot median and peripheral, and a nucleus. Lorica split- 

 ting into halves during fissiparation. Long diameter l-1350th 

 of an inch. 



Found in most of the tanks and many of the wells in the island 

 of Bombay. Active throughout the year. 



Obs. This is the little Thecamonadina to which I have before 

 alluded, as being associated with a species of (Edogonium, and 

 which I wrongly conjectured to be a spore of this Alga*. It 

 resembles Cryptomonas lenticularis, Ehr., in the compressed form 

 and thickness of the lorica, while the bilabiate notch and oblique 

 fissure in the margin ally it to Euglena, but not to Trachelo- 

 monas or Lagenella, which have a round aperture respectively for 

 the exsertion of their cilium. It approaches Chlamydococcus in 

 having two cilia, and in its mode of fissiparation, whilst it re- 

 sembles Schizochlamys, Braun, in the splitting of the lorica. 

 * Annals, vol. i. 1858, p. 35. 



