260 Miss S. G. Fonlke on Chilomonas paramgecium. 



Fig. ]3. Sigillaria discophwa, Konig, sp. From Furnace-Bank Pit, Old 

 Sauchie, Clackmannanshire. Coal-measures. (Specimen No. 14.) 

 i natural size. 13 a. A few leaf-scars, natural size. 13 J. Small 

 portion of fig. 13, sliowing Batkrodendron-CGn^iiou, natural 

 size. 



Fig. 14. LejndopMoios seoticus, Kidston. From West Calder, Midlo- 

 thian. Oalciferons-Sandstone series. a, articulating leaf- 

 surface ; g, downward-directed cortical cushion. 



Fig. 15. Lepidodendron acideatum, Sternberg. Leaf-sear, to show its 

 various parts : a, vascular scar or impression ; h, vascular- 

 hundle impression ; c c, the " field ;" d d, oval pits ; e, '^ ligule " 

 depression ; f, medial line. 



XXV. — CMlomonas paramcBcimn. By SaeA Gwendolen 

 FOULKE *. 



: [Plate IX. B. figs. 1-6.] 



Since its discovery by Ehrenberg this form has been carefully 

 studied by Biitschli, Stein, and Kent, the two latter giving 

 the first entirely accurate diagnosis of its character. 



According to Kent CMlomonas is classified as follows : — 

 Order Flagellata-Eustomata; Family Chilomonadidse ; Genus 

 CMlomonas. 



Fig. 1, PL IX. B, represents the form so accurately that 

 no del ailed description is necessary. 



Biitschli states that this animalcule, when isolated for 

 observation, quickly loses its normal contour, and becomes 

 spherical, finally disintegrating. 



While I was investigating a drop of water teeming with 

 CMlomonas a minute flagellate amoeboid form (fig. 2) entered 

 the field, and after swimming uncertainly about for some 

 moments, settled to the bottom of the live-box, where it 

 moved in amoeboid fashion, the two flagella becoming merged 

 in the pseudopodium-like processes. The presence of about 

 twenty small highly refractive bodies_, suspected to be germs, 

 was noticed. Soon the mass became so diffused as to form a 

 mere film, and presently disintegrated, setting free these 

 bodies, which swam away. Several similar individuals were 

 found, some of which, on becoming quiescent, took a globular 

 shape, retaining both flagella to the last. This sphere then 

 grew larger and its wall thinner, until, like a bubble, it burst, 

 liberating the germs, which were always present and very 



* Fiom the ' Journal of the Kew-York Microscopical Society.' 



