494 



SYSTEMATIC BISTORT OF THE INFUSORIA. 



form ovate, rounded equally at both ex- 

 tremities ; red stigma ; filament distinct, 

 nearly as long as its body j motion vibrat- 

 ing, rotary on its long axis, (xviii. 6. 

 Three animalcules magnified, the first 



800 diameters, exhibiting the internal 

 organization as represented by Ehren- 

 berg.) Among slimy- water plants 

 (Hampstead and Finchley). 1-2300" 

 to 1-720". 



Genus CHLORASTEE. — Solitary, without tail ; mouth terminal ; with a 

 frontal ocellus or eye-speck ; central portion of body with radiating rows of 

 raised points (verrucae). It is allied to the genera Glenomormn and Phacelo- 

 7nonas, but differs from the former by being solitary (not clustering), and by 

 the greater number of filaments, and from Phacelomonas by having fewer 

 filaments. 



Chloraster gyrans. — Green ; central I acute ; central raj^s of puncta four, 

 part of body fusiform; extremities | Filaments from 4 to 5". 1-632". 



Genus PHACELOMONAS. — Filaments numerous (8-10) around the mouth. 

 In other respects it resembles Microglena : it has the small red eye, the trun- 

 cated mouth at the anterior extremity, but is without a tail. It swims 

 in the direction of the longitudinal axis ; and its self-division is simple and 

 complete, but not constant in occurrence. Many vacuoles are seen within 

 the body, but they have not been noticed to admit coloured food. This genus 

 has not been figured by Ehrenberg. 



when dying it changes to a globular 

 shape. In swimming, it turns quickly 

 upon its longitudinal axis, without any 

 vibration. In green puddles. 1-1152". 

 Ph. Bodo (Stein) = Uvella Bodo (E.). 



Phacelomonas Pulvisculus (Monas 

 pidvisculus, M.). — Figm'e oblong or 

 slightly conical, attenuated posteriorly ; 

 of a beautiful green coloiu*. Just pre- 

 vious to self-division, its body becomes 

 cylindrical, then contracts at the centre ; 



Genus GLENOMOEUM (XYIII. 7).— Characterized by having a single 

 red eye-speck, a truncated mouth, and two filaments ; tail absent. Self- 

 division simple and complete ; their clustering is voluntary as occasion may 

 require, and gives them the resemblance to a bunch of grapes. They STivim 

 in the direction of their long axis. 



In this enumeration of the characters belonging to this genus, we are pre- 

 sented with an excellent illustration of the table (and one that exceedingly 

 well explains its nse), under which aU the genera of the family Monadina are 

 so arranged as to exemplify in what respects they are alike, and in what they 

 differ from each other. For example (see Table, p. 487), Glenomormn 

 closely resembles Uvella, but differs from it by the superaddition of the red 

 stigma ; it differs from Monas and Mic7vglena in occasionally aggregating ; 

 from Chilomonas, in being deficient of the projecting lips ; from Bodo, in not 

 having the tail ; from Phacelomonas, by the double proboscis ; from Doocococcus, 

 by swimming instead of rolling over or revolving in the water; and from 

 Polytoma, by never appearing in clusters whilst undergoing self-division. 



Glenomorum tingens (xviii. 7). — 

 Fusiform, three or four times longer than 

 broad, of a beautiful green colour, with 

 double, exceedingly delicate proboscis 

 about half the length of its body. Inter- 

 nally are some small whitish vesicles, 

 and the minute granules which give rise 

 to the green colour. About the centre 

 of the body is a large transparent colour- 

 less organ, the nucleus. The beautiful 

 red eye-speck is placed about one-third 



from the anterior extremity of the body. 

 These animalcules constitute a great 

 portion of the green matter commonly 

 seen on stagnant water, and discovered 

 by Priestley. They appear to be nearly 

 allied to Cercaria viridis, from which 

 they differ only in magnitude and in 

 the unalterable form of their bodies. 

 Plentiful at Hampstead. Size 1-3600" 

 to 1-1700". 



